Cliostomum Piceicola
''Cliostomum'' is a genus of lichen-forming fungi in the family Ramalinaceae. It has about 20 species. The genus was established in 1825 by Elias Magnus Fries, who characterized it by its rounded fruiting bodies that are integrated into the lichen's crust with distinctive folded or corrugated openings. These lichens form tight crusts on various surfaces, ranging in colour from whitish to pale grey or yellowish, and reproduce primarily through conspicuous flask-shaped structures that release spores rather than through sexual fruiting bodies. Taxonomy The genus was circumscribed by Elias Magnus Fries in 1825, with '' Cliostomum corrugatum'' assigned as the type species. In his original description, Fries characterized ''Cliostomum'' as having rounded perithecia that are integrated into the thallus, with multiple transverse folds or pleats that cause the ostiole to gape open. He noted that the subiculum (underlying fungal tissue) is absent, and placed the genus as the first tribe ...
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