Chapsa Alborosella
''Chapsa'' is a genus of lichens in the family Graphidaceae. These lichens form thin, grey-whitish to pale olive crustose lichen, crusts on tree bark and are characterized by fruiting bodies that start as slits but expand into round to angular discs level with the surface, each bordered by a pale rim. The genus has a pantropical to warm-temperate distribution, growing on shaded bark in humid lowland or foothill rainforests, with over 60 species that often serve as bioindicator, indicators of disturbance (ecology), undisturbed forest habitats. Taxonomy The genus was circumscription (taxonomy), circumscribed by the Italian lichenologist Abramo Bartolommeo Massalongo in 1860. The genus was resurrected by Frisch and colleagues in 2006 to include species earlier classified in ''Chroodiscus'', ''Myriotrema'', ''Ocellularia'', and ''Thelotrema''. Description ''Chapsa'' forms a thin, grey-whitish to pale olive crust (thallus) lacking a true . Its ascomata are : they start as slits b ...
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