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Pyrenodesmia Helygeoides
''Pyrenodesmia'' is a genus of lichen-forming fungi in the family Teloschistaceae. The genus currently includes 23 recognized species but is believed to contain many more unnamed taxa. The genus was circumscription (taxonomy), circumscribed in 1852 by Italian lichenologist Abramo Bartolommeo Massalongo. It is characterised by the complete absence of anthraquinones and the presence of Sedifolia-gray biological pigment, pigments in both the thallus and apothecia. These lichens are typically found in calcareous outcrops in the Northern Hemisphere, with biodiversity centres in the Mediterranean basin, Central Asia, and arid regions of western North America. Taxonomy The genus ''Pyrenodesmia'' was circumscription (taxonomy), circumscribed by Abramo Bartolommeo Massalongo (1852). In his original conception, Massalongo included four species (''P. agardhiana'', ''P. chalybaea'', ''P. olivacea'', and ''P. variabilis'') and three infraspecific taxa (''P. variabilis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrenodesmia Variabilis
''Pyrenodesmia variabilis'' is a species of saxicolous lichen, saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. Characteristics of the species include its dark, thallus, and its dark, (stalkless) (fruiting bodies). It occurs on nutrient-rich limestone surfaces in Northern Europe, North America, Central America, and Asia. Taxonomy The species was first species description, scientifically described in 1794 by Christiaan Hendrik Persoon, who called it ''Lichen variabilis''. Abramo Bartolommeo Massalongo transferred the taxon to the genus ''Pyrenodesmia'' in 1852, a genus he circumscription (taxonomy), circumscribed to include a group of four species (''P. agardhiana'', ''P. chalybaea'', ''P. olivacea'', and ''P. variabilis''), all of which lacked anthraquinones (a class of secondary metabolites common in the family Teloschistaceae), and contained instead the insoluble lichen pigment . As its botanical name, species epithet suggests, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |