Relevant bibliographies by topics / Usnea Lichens

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Academic literature on the topic 'Usnea Lichens'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Usnea Lichens"

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KUSMORO, JOKO, IIN SUPARTINAH NOER, MUHAMAD FEISAL JATNIKA, RIRIN EKA PERMATASARI, and RUHYAT PARTASASMITA. "Lichen diversity in geothermal area of Kamojang, Bandung, West Java, Indonesia and its potential for medicines and dyes." Biodiversitas Journal of Biological Diversity 19, no. 6 (2018): 2335–43. http://dx.doi.org/10.13057/biodiv/d190643.

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Kusmoro J, Noer IS, Jatnika MF, Permatasari RE, Partasasmita R. 2018. Lichen diversity in geothermal area of Kamojang, Bandung, West Java, Indonesia and its potential for medicines and dyes. Biodiversitas 19: 2335-2343. The study of lichens diversity in Kamojang, West Java was conducted by survey in geothermal field area following the line transect 6 km along to the East, North West and south from the Power House of Geothermal Power Plant. The lichen samples were taken from bark, soil, and stone. Lichen identification was done by morphological, anatomy and chemical analysis. Dyes potency of Pa
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Popovici, Violeta, Laura Bucur, Teodor Costache, et al. "Studies on Preparation and UHPLC Analysis of the Usnea Barbata (L) F.H.Wigg Dry acetone extract." Revista de Chimie 70, no. 11 (2019): 3775–77. http://dx.doi.org/10.37358/rc.19.11.7645.

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In the category of medicinal plants with remarkable therapeutic properties, lichens are also included. An important representative of this group is the Usnea Adans. genus, with over 650 species spread throughout the globe. Representative species of this genus were also found in Romania, so the studies were conducted on Usnea barbata (L.) F.H.Wigg., harvested from the Calimani Mountains, Suceava County. The objectives of this research are: obtaining the dry extract of the Usneae lichen followed by the identification and determination of the usnic acid content by ultra-high performance liquid ch
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Popovici, Violeta, Laura Bucur, Teodor Costache, et al. "Studies on Preparation and UHPLC Analysis of the Usnea Barbata (L) F.H.Wigg Dry acetone extract." Revista de Chimie 70, no. 11 (2019): 3775–77. http://dx.doi.org/10.37358/rc.70.19.11.7645.

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In the category of medicinal plants with remarkable therapeutic properties, lichens are also included. An important representative of this group is the Usnea Adans. genus, with over 650 species spread throughout the globe. Representative species of this genus were also found in Romania, so the studies were conducted on Usnea barbata (L.) F.H.Wigg., harvested from the Calimani Mountains, Suceava County. The objectives of this research are: obtaining the dry extract of the Usneae lichen followed by the identification and determination of the usnic acid content by ultra-high performance liquid ch
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Kappen, L., and M. Breuer. "Ecological and physiological investigations in continental Antarctic cryptogams II. Moisture relations and photosynthesis of lichens near Casey Station, Wilkes Land." Antarctic Science 3, no. 3 (1991): 273–78. http://dx.doi.org/10.1017/s0954102091000330.

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In the second of three field studies on the ecology and physiology of lichens on Clark Peninsula, Wilkes Land, Antarctica, photosynthetic activity due to natural and artificial soaking of lichen thalli was investigated. Gravimetric measurements were used to quantify water uptake by lichens in contact with snow or ice. Quantum flux density under a 15 cm thick layer of snow can reach light saturation for net photosynthesis of Usnea sphacelata at temperatures around 0°C. Measurements with a steady-state CO2 diffusion porometer in the field reveal that, in Usnea antarctica, Umbilicaria decussata,
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Rheault, Héloïse, Pierre Drapeau, Yves Bergeron, and Per-Anders Esseen. "Edge effects on epiphytic lichens in managed black spruce forests of eastern North America." Canadian Journal of Forest Research 33, no. 1 (2003): 23–32. http://dx.doi.org/10.1139/x02-152.

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We studied the spatial and temporal response of three epiphytic lichens (Bryoria spp., Evernia mesomorpha Nyl., and Usnea spp.) to edge effects in conifer forests of northwestern Quebec. Lichen abundance and substrate variables were sampled at four distances (5, 25, 50, and 100 m) from the edge in 15 edge–interior transects in managed black spruce (Picea mariana (Mill.) BSP) forests. Responses to edge effects were assessed for short-term (1–3 years) and long-term (8 and 16–23 years) periods. We also assessed the effect of forest fragment size on lichen abundance in 27 forest fragments ranging
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Boudreault, Catherine, Yves Bergeron, and Darwyn Coxson. "Factors controlling epiphytic lichen biomass during postfire succession in black spruce boreal forests." Canadian Journal of Forest Research 39, no. 11 (2009): 2168–79. http://dx.doi.org/10.1139/x09-127.

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Alectorioid lichens are the dominant group of epiphytic lichens in boreal forests. Epiphytic lichen richness and abundance generally increase with stand age and within-stand heterogeneity. The objective of this study was to evaluate the importance of time elapsed since the last fire, stand structure, tree size, tree age, and branch height for epiphytic lichen biomass of the boreal forest of western Quebec. We sampled 12 sites belonging to four forest age classes (from 50 to >200 years). We assessed epiphytic lichen biomass of three species groups ( Bryoria , Evernia , and Usnea ) on 12 tree
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Kaasalainen, Ulla, Jouko Rikkinen, and Alexander R. Schmidt. "Fossil Usnea and similar fruticose lichens from Palaeogene amber." Lichenologist 52, no. 4 (2020): 319–24. http://dx.doi.org/10.1017/s0024282920000286.

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AbstractFruticose lichens of the genus Usnea Dill. ex Adans. (Parmeliaceae), generally known as beard lichens, are among the most iconic epiphytic lichens in modern forest ecosystems. Many of the c. 350 currently recognized species are widely distributed and have been used as bioindicators in air pollution studies. Here we demonstrate that usneoid lichens were present in the Palaeogene amber forests of Europe. Based on general morphology and annular cortical fragmentation, one fossil from Baltic amber can be assigned to the extant genus Usnea. The unique type of cortical cracking indirectly de
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K, Ramya, and Thirunalasundari T. "A STUDY ON EPIPHYTIC LICHENS FROM PRUNUS PERSICA." Asian Journal of Pharmaceutical and Clinical Research 11, no. 3 (2018): 118. http://dx.doi.org/10.22159/ajpcr.2018.v11i3.23066.

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Objective: The objective of this study is to explore and identify the epiphytic lichens on the tree bark of Prunus persica from Kodaikanal area and analyze its phytochemical properties.Methods: Samples were collected from Kodaikanal area, identified by morphological and chemical constituents. Macromolecules present were quantified by DNS method, Lowry’s method, and lipid tests. The secondary metabolites present were analyzed by standard phytochemical tests and thin-layer chromatography.Results and Conclusion: It was interesting to observe that species belonging to the lichen genera - Parmotrem
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Esseen, Per-Anders. "Litter fall of epiphytic macrolichens in two old Picea abies forests in Sweden." Canadian Journal of Botany 63, no. 5 (1985): 980–87. http://dx.doi.org/10.1139/b85-132.

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The seasonal and annual variation in the litter fall of epiphytic lichens and tree litter was studied over a period of 2 to 3 years at two forested hills in the eastern part of central Sweden. Litter fall was measured using traps and for one species, Usnea longissima, by collecting specimens present on the ground. Total litter fall amounted to 2.5 and 2.8 tons ha−1 year−1 of which lichens constituted 4.6 and 5.7% at the two sites. Lichen litter fall was highest during the period from late autumn to the beginning of summer. Both the lichens and the tree litter showed significant between-year di
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Sinichkin, Evgeny Arkadyevich, Gennady Alekseevich Bogdanov, Alexander Veniaminovich Dimitriev, Nadezhda Vladimirovna Smirnova, and Peter Nickolaevich Omelchenko. "The study of lichens in the state natural reserve «Zavolzhsky» (Chuvash Republic)." Samara Journal of Science 7, no. 4 (2018): 108–15. http://dx.doi.org/10.17816/snv201874119.

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The paper provides information about lichens found on the territory of the state natural reserve Zavolzhsky, which is a specially protected natural area of the Chuvash Republic. It was established for the protection of the unique natural landscape, located on the territory of Cheboksary and Cheboksary District, as well as for rare and endangered animals, plants and other organisms from high anthropogenic activity. As a result of lichen investigations (2011-2016) 134 species belong to 59 genera from 31 families of lichen flora were recorded. It emphasizes a high environmental significance of th
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Dissertations / Theses on the topic "Usnea Lichens"

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Lessard, Martine. "Caractérisation des produits naturels odorants retrouvés dans les lichens de genre usnea et bryoria de la région du mont Apica, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1990. http://theses.uqac.ca.

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Eriksson, Amanda. "Water storage in the lichen genus Usnea in Sweden and Norway : Can morphological and water storage traits explain the distribution and ecology of epiphytic species?" Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-122696.

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Lichens are poikilohydric and cannot control water uptake and loss, water relations could therefore impact their distribution. This study examines if morphological, anatomical, and water storage traits could explain distribution of epiphytic species in the lichen genus Usnea. Seven species from oceanic (Norway) and continental areas (Sweden) were studied. Total, internal, and external water holding capacity (WHC, mg H2O cm-2) along with relative water content (WC) were recorded by spraying the thalli with water and measuring mass after shaking and blotting. The specific thallus mass (STM, mg c
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Articus, Kristina. "Phylogenetic Studies in Usnea (Parmeliaceae) and Allied Genera." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3974.

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Shrestha, Gajendra. "Predicting the Distribution of Air Pollution Sensitive Lichens Using Habitat Niche Modeling." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2595.

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Usnea hirta and Xanthoparmelia cumberlandia are commonly used as bio-monitors of air quality. In order to more accurately and efficiently determine the distribution of these two sensitive indicator species, we have developed a probabilistic distribution map as a function of 9 macroclimatic and topographic variables for the White River National Forest, Colorado using Non-Parametric Multiplicative Regression (NPMR) analysis. Furthermore, we also developed a logistic regression (LR) model for X. cumberlandia in order to evaluate the strengths and limitations of the NPMR model. The best model for
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Idamokoro, Emrobowansan Monday. "Incidence of Staphylococcus species in bovine milk: their antimicrobial sensitivity in selected antibiotics and Usnea barbata lichen extracts." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016193.

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This study was done in order to assess the incidence of Staphylococcus species from milk of cows with subclinical mastitis and their antimicrobial sensitivity in some selected antibiotics and Usnea barbata lichen extracts. The study was conducted in two different commercial dairy farms. Staphylococcus species isolates were identified using several biochemical tests which included Gram’s staining test, catalase test and oxidase test. A commercial API® staph kit (bioMerieux, France) was used to confirm the bacterial organisms to their species level. The antimicrobial sensitivity of individual sp
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Andraud-Dieu, Amandine. "Recherche de molécules antimicrobiennes d'origine lichénique : Etude phytochimique de trois lichens & approche synthétique de deux composés actifs." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0029/document.

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L’étude physicochimique de trois lichens récoltés en Limousin, Usnea florida, Flavoparmelia caperata et Cladonia incrassata, a permis d’isoler et de caractériser 16 composés issus du métabolisme secondaire. Dans un premier temps, ces lichens ont été sélectionnés lors d’un criblage analytique préliminaire réalisé sur 17 espèces. L’activité antimicrobienne des extraits acétoniques a été évaluée, puis leur fractionnement bioguidé a été mis en œuvre. Les deux isomères de l’acide usnique, 3 dibenzofuranes, 4 depsides, 3 depsidones, un acide aliphatique, un phtalide et un stérol ont été isolés. Une
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Halonen, P. (Pekka). "Studies on the lichen genus Usnea in East Fennoscandia and Pasific North America." Doctoral thesis, Oulun yliopisto, 2000. http://urn.fi/urn:isbn:9514255240.

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Abstract The shrubby Usnea species of East Fennoscandia and the whole known Usnea flora of British Columbia were studied. Furthermore, the status and distribution of Usnea hirta and U. longissima, which have divergent habitat requirements and distribution patterns, were surveyd in East Fennoscandia. The two species also occur in British Columbia and their chemistry, ecology and distribution were compared in the two study areas. The nomenclature and taxonomy of U. hirta were also revised. Nine shrubby Usnea species were documented from East Fennoscandia and 25 species and species groups were r
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Libell, Joel. "Betydelsen av skogens slutenhet för gammelskogslaven långskägg, Usnea longissima." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160080.

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The epiphytic lichen Usnea longissima is strongly associated with old-growth forests and is declining. Previous studies have documented unimodal relationships between stand density and abundance of U. longissima. The aim of this thesis has been to investigate whether the same relationship is found in Sweden and to determine the optimum level of stand density. The study area (1.4 ha) was divided into a grid with 48 circular plots (10-m radius). Stand density was measured as basal area (m²/ha) using a relascope and abundance of U. longissima was measured as the length of the longest thallus pres
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Lohézic-Le, Dévéhat Françoise. "Evaluation de l'activité biologique de plantes tropicales et d'un remède traditionnel Benalu Teh r. Etude particulière de Scurrula ferruginea Danser (Loranthaceae) et du lichen usnea articulata (L. ) Hoffm. (Parmeliaceae)." Rennes 1, 2002. http://www.theses.fr/2002REN1A084.

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Un criblage cytotoxique sur des lignées cancéreuses murines et humaines de douze plantes tropicales a conduit à l'étude phytochimique plus approfondie d'une plante Scurrula ferruginea Danser (Loranthaceae) et d'un lichen Usnea articulata (L. )Hoffm. (Parmeliaceae) appartenant tous les deux à un remède traditionnel indonésien Benalu Teh â utilisé comme tonique et pour ± lutter contre le cancer α. S. Ferruginea est une plante hémiparasite et nous avons pu mettre en évidence une influence de l'hôte sur son activité cytotoxique sur les cellules U251. Après une diagnose de cette plante, l'extrait a
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Pittam, Sherry K. "Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon : taxonomy; morphological characters; and geographical distribution." Thesis, 1995. http://hdl.handle.net/1957/35317.

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Pendent Usnea species were collected in western Oregon and examined. Character states, such as cortex-medulla-axis ratio; fibril length; papilla diameter; branching patterns; and presence or absence of fibrils, papillae, soredia, isidia; plus chemistry, were recorded and analyzed by inspection for differences. Historical names were researched in the literature. A comparison was made between species concepts used in these accounts, with many conflicting concepts encountered. Selected morphological characters were examined by scanning electron microscope, or dissecting microscope, described, and
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Books on the topic "Usnea Lichens"

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Walker, F. Joy. The lichen genus Usnea subgenus Neuropogon. British Museum (Natural History), 1985.

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Usnea: The herbal antibiotic and other medicinal lichens. Botanica Press, 1986.

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Hobbs, Christopher. Usnea: The herbal antibiotic: and other medicinal lichens. Hobbs, 1985.

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Walker, F. Joy. The lichen genus Usnea subgenus Neuropagan. British Museum(Natural History), 1985.

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Hobbs, Christopher. Usnea: The herbal antibiotic and other medicinal lichens (Herbs and health series). Botanica Press, 1986.

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Pittam, Sherry K. Pendent Usnea (Lichens; Ascomycetes; Parmeliaceae) in Western Oregon: Taxonomy; morphological characters; and geographical distribution. 1995.

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7

P, Gough L., and Geological Survey (U.S.), eds. Element baselines for Redwood National Park, California: Composition of the epiphytic lichens Hypogymnia enteromorpha and Usnea spp. U.S. Dept. of the Interior, Geological Survey, 1987.

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Book chapters on the topic "Usnea Lichens"

1

Kappen, L. "Water Relations and Net Photosynthesis of Usnea. A Comparison between Usnea Fasciata (Maritime Antarctic) and Usnea Sulphurea (Continental Antarctic)." In Lichen Physiology and Cell Biology. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2527-7_4.

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Conference papers on the topic "Usnea Lichens"

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Popovici, Violeta, Laura Bucur, Verginica Schroder, Aureliana Caraiane, and Victoria Badea. "STUDIES ON THE CYTOTOXIC POTENTIAL OF THE EXTRACT OF USNEA BARBATA (L.) F.H.WIGG." In NORDSCI International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/nordsci2020/b1/v3/29.

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Usnea barbata (L.) F.H.Wigg. is a fruticose lichen widespread in coniferous forests in the temperate zone of Europe and North America. The special dual structure of lichens, the result of the symbiosis between a fungus and an alga / cyanobacteria and the specific conditions in which they live, determine the synthesis of many special organic compounds - secondary metabolites - which ensure optimal protection against disturbing physical and biological factors. The present study aims to evaluate the cytotoxic activity of the extract of Usnea barbata (L.) F H Wigg. The cytotoxic activity was evalu
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Popovici, Violeta, Laura Bucur, Gabriela Vochita, Victoria Badea, and Florin-Ciprian Badea. "CONTRIBUTIONS TO THE COMPLEX STUDY ON ANTITUMOR ACTIVITY OF USNEA BARBATA (L.) F.H.WIGG." In NORDSCI International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/nordsci2020/b1/v3/25.

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Usnea barbata (L.)F.H.Wigg. - known as “old man’s beard”, “tree moss”, “songluo” is a lichen in the family Parmeliaceae, genus Usnea. Usnea species have recorded history of therapeutic use dating back over three thousand years in Chinese medicine. The lichen secondary metabolites have shown an impressive range of biological proprieties, including antibiotic, antifungal, antiviral, anti-inflammatory, or anticancer activities. In this study, the antitumor activity of Usnea barbata extract was evaluated by observing the morphological changes on squamous cells carcinoma cell-line CAL 27 (ATCC® CRL
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Pamenta, A. F. A., T. Azis, A. H. Watoni, et al. "Antimalarial activity of lichen Usnea longissima." In THE 8TH INTERNATIONAL CONFERENCE OF THE INDONESIAN CHEMICAL SOCIETY (ICICS) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001501.

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Gunasekaran, Saranyapiriya, Vinoshene Pillai Rajan, Mohd Wahid Samsudin, Laily Din, Surash Ramanathan, and Vikneswaran Murugaiyah. "Antibacterial activity of lichen Usnea rubrotincta, Ramalina dumeticola, and Cladonia verticillata." In THE 2015 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4931293.

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Bakar, Siti Zaharah Abu, Jalifah Latip, Laily bin Din, and Mohd Wahid Samsuddin. "Metabolic fingerprinting of lichen Usnea baileyi by Fourier transform infrared spectroscopy." In THE 2014 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895239.

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