Study On The Lichen Family Physciaceae From Region Of Mt.Taibai In Qinling

Studies on the lichen family Physciaceae are performed using the methods of morphology, anatomy, chemistry, phytogeography on the basis of investigation of about 420 specimens from Shaanxi and about 300 species deposited in HMAS-L.Thirty-eight species included in six genera which are Anaptychia, Heterodermia, Phaeophyscia, Physcia, Physconia and Pyxine reported in this paper. Among them2 species(Anaptychia runcinata, Physconia venusta) are newly recorded in China and 13 species are first reported in Shannxi, namely Anaptychia setifera, Heterodermia dentritica, Heterodermia subascendens, Phaeophyscia hunana, Phaeophyscia imbricata, Phaeophyscia pyrrhophora, Phaeophyscia rubropulchra, Phaeophyscia sciastra, Phaeophyscia trichophora, Physcia phaea, Physconia elegantula, Physconia lobulifera, pyxine limbulata.The geographical analysis of taxa reported in the paper indicates that the thirty-eight species belong to four geographical elements, namely cosmopolitan element (6species, 15.8%), temperate element with 5 distributional patterns (30species, 78.9%), temperate element to old continent (1 species, 2.6%) and species endemic to China (1 species, 2.6%).The structure of cortices and the characters of ascospore wall revealed by the light microscope are good characters at the species, or even at the generic level.There are eleven secondary natural products examined by using thin layer chromatography and chemical spot test in the text, among them five are unknown.The keys to the genera and species of the family Physciaceae are presented in the paper. Detailed descriptions and discussions on morphology and chemistry of each species are made.The morphological photos of the thallus and some anatomy photos are also taken and given in the paper.