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Pseudothelomma
''Pseudothelomma'' is a genus of crustose pin lichens in the family Caliciaceae. It currently contains two species. The genus was circumscribed in 2016 by lichenologists Maria Prieto and Mats Wedin. The generic name ''Pseudothelomma'' refers to its resemblance to genus ''Thelomma'', where the two species used to be classified. Both species grow on dry exposed wood, particularly fence posts. Description ''Pseudothelomma'' has a thallus that is crustose, grey, with a thin cortex. The ascomata are immersed in wrinkles, and are flat, sometimes with a green or yellow pruina on the mazaedia. The spores have a single septum and are black-brown in colour. Secondary chemicals found in ''Pseudothelomma'' include usnic acid in the thallus (occasionally), and epanorin and rhizocarpic acid in the hymenium and mazaedium The following is a glossary of terms used in the description of lichens, composite organisms that arise from algae or cyanobacteria living among filaments of multipl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudothelomma Ocellatum
''Pseudothelomma ocellatum'' is a species of lignicolous (wood-dwelling), crustose lichen in the family Caliciaceae. This lichen is characterised by its grey, areolate thallus that produces abundant lichenised diaspores, such as short spherical isidia and coarse, dark brown-black soredia. It is typically sterile, meaning apothecia (fruiting bodies) are absent. ''Pseudothelomma ocellatum'' is primarily a Northern Hemisphere lichen, especially found in temperate to cool temperate areas, and somewhat rare in North America where its range has expanded from southern California to the Yukon since its first documentation in 1978. Its habitats include weathered wooden structures influenced by nitrate enrichment, and while it is largely found in European mountain ranges and reported in New Zealand and South Africa, recent findings also place it in Tasmania, suggesting a broader distribution than previously thought. ''Catillaria fungoides'' and overgrown '' Buellia griseovirens'' share c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudothelomma Occidentale
''Pseudothelomma occidentale'' is a species of corticolous (bark-dwelling), crustose lichen in the family Caliciaceae. It was first formally described by Albert William Herre in 1910, who initially classified it in the genus '' Cyphelium''. Leif Tibell transferred it to ''Thelomma'' in 1976. In 2016, María Prieto and Mats Wedin transferred the taxon to the newly circumscribed genus ''Pseudothelomma''. In his original description of the lichen, Herre identified ''Cyphelium occidentalis'' as a new species, previously determined as an ''Acolium'' species by Hasse in 1902. He described the thallus as determinate, forming either rounded or oval patches, or spreading extensively, composed of thick with surfaces of many small nodules, creating a deeply fissured, chinky crust of whitish or ashy-grey colour, not reacting to KOH or CaCl2 tests. The apothecia were noted to be innate in swollen warts, varying in size from small to large, with a black and a thick, white, often concealed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
