Lichen

About: Lichen is a research topic. Over the lifetime, 7015 publications have been published within this topic receiving 158026 citations. The topic is also known as: lichens.

Characterization of the Vegetational Communities Associated with Ancient Juniperus Virginiana L. Stands in the Obed Wild and Scenic River Gorge

Abstract: A vegetational survey of ancient red cedar (Juniperus virginiana L.) stands in the talus areas of the Obed Wall and North Clear Creek (NCC) in the Obed Wild and Scenic River Gorge was conducted. The diversity and abundance of vascular plants were found to be higher at the Obed Wall site than that at the NCC site, while the reverse was true for lichens and bryophytes. Statistical analysis of percent coverage and frequency of vascular plants from systematic sampling revealed significant variations in species composition between the Obed and NCC sites. Also, species accumulation curves were determined for vascular plants, lichens and bryophytes found in association with red cedars. Asymptotes were observed for lichens and bryophytes but an asymptote was not observed for vascular plant diversity. The age-class structure of red cedars showed an inverse J-shaped curve, which represents continuous, balanced recruitment and mortality of these stands. Of the 36 living trees cored, the oldest-living red cedar was found to be 767 years old. A general climatic history of the Obed area was reconstructed back to 1246 A.D. but this is not a precise reconstruction because of the prevalence of false rings.

Infl uence of Nothofagus bark pH on the lichen and bryophytes richness

Abstract: The influence of the pH of the bark of two tree species belonging at Nothofagus genus on the lichen and bryophyte richness was studied. The tree species considered for this study were: N. dombeyi and N. macracarpa situated in two pre-Andean localities; one in the “Radal Siete Tazas” National Reserve and the other in the “Altos de Lircay” National Reserve, Central Chile. In each locality, a total of 20 phorophytes were examined: 10 N. dombeyi and 10 N. obliqua. In each phorophyte, the total lichens and bryophytes were inventoried, the diameter of each one of the phorophytes was measured at breast height (DHA) and, in addition, 10 g of bark were extracted in order to check the pH. The pH of the bark was determined by means of the Mezger’s method (1996) and afterwards related to the lichen and bryophyte richness found in the phorophytes of each tree species sampled in both localities. In both localities, the pH of bark of the N. dombeyi phorophytes was markedly more acidic than the one of the N. obliqua. Statistical analyses show a significant difference between the pH of one species and other. The pH of the barks of N. dombeyi and N. obliqua phorophytes, in both localities, not correlated with the richness of the different groups (lichens, mosses and liverworts). However, according to the inventories carried, it observed that some species of lichens have a close relation with the pH of the bark of one or other of the two tree species studied and only a low percentage of them were indifferent to pH of the phorophytes. The mosses preferred bark with pH near to neutrality such as those of N. obliqua, while the liverworts preferred bark were more acid, such as the ones of N. dombeyi.

The Researching Progress of Usnic Acid

Abstract: Usnic acid has been one of the widest studied lichens substances since it abstracted from lichens in 1844. The applied technology of usnic acid such as antibiotic chemical character environment monitor and medical study are reported in kinds of foreign literatures. The study of applied technology are in America Japan and German basically. The basic study of usnic acid such as antibiotic abstract are in China. Chinese literatures are fewer especially. Usnic acid only exist in lichens and abundant in the following species Alectoria Cladonia Lecanora Usnea Ramalina and Evernia.

An acid deficient population of Lambiella psephota from Antarctica and a new combination in the genus from Campbell Island with a world-wide key to the genus

Abstract: Only two species of the lichen genus Lambiella are known from Antarctica: L. impavida and L. psephota. Here we report a new chemotype of L. psephota collected from James Ross Island in the North-East Antarctic Peninsula region. nrITS, mtSSU and RPB1 gene regions of the norstictic acid deficient L. psephota were obtained, which showed the new chemotype phylogenetically belongs to L. psephota. We also transfer Rimularia maculata to Lambiella, and provide an identification key of the 17 known species of Lambiella world-wide

New cryptogamic records. 10

Abstract: First records of Xanthophyceae for the Vologda and Sverdlovsk regions, and Moscow, Characeae for the Vologda, Orenburg, Tver regions and the Crimea Peninsula, diatoms for the Orenburg Region, aphyllophoroid fungi for the Novgorod and Tyumen regions, agaricoid fungi for the Novosibirsk and Vologda regions, and for the Republic of Altai, lichens for the Arkhangelsk and Murmansk regions, Altai Territory, the Republic of Buryatia and Primorye Territory, mosses for the Kabardino-Balkarian Republic, the Republic of Buryatia, Novaya Zemlya Archipelago and the Kuril Islands, liverwort for the Kurgan Region are presented. The data on their localities, habitats, distribution are provided. The specimens are kept in the herbaria of the Altai State University (ALTB), of the Papanin Institute for Biology of Inland Waters of the Russian Academy of Sciences (IBIW), of the Institute of Problems of Industrial Ecology of the North KSC RAS (INEP), of the Polar-alpine botanical garden-institute KSC RAS (KPABG), of the Komarov Botanical Institute RAS (LE), of the Mire Research Group of the Papanin Institute for Biology of Inland Waters RAS (MIRE), the Central Siberian botanical garden SB RAS (NSK), of the Natural History Museum in Oslo, Norway (O), of the Petrozavodsk State University (PZV), of the Museum of the Institute of Plant and Animal Ecology (SVER), of the Tobolsk complex scientific station of the UB RAS (TOB), of the Institute of General and Experimental Biology SB RAS (UUH) and algological collection in the laboratory of the Algology Group of the Institute for Cellular and Intracellular Symbiosis of the UB RAS.