A rarely fertile species, characterized by conspicuous, pale, sessile and pruinose pycnidia of 0.2–0.4 mm in diam. Freshly green thallus contains xanthones and is deliminated by white prothallus.
This sub-Atlantic lichen is more or less restricted to afforested river valleys, where it grows on various shaded substrates near the water. On very shady, vertical to overhanging siliceous rocks and boulders, tree bases and protruding roots, it often occurs in communities with its two relatives, A. viridifarinosa and A. trachona. Aquacidia antricola is probably the rarest of all the three Czech genus members. It is linked to microhabitats with consistently high air humidity, usually in the immediate vicinity of watercourses. It is a species of mild climatical conditions; it does not ascend higher into mountains in the Czech Republic. So far, it has been found only in a few natural river valleys in eastern and southern Bohemia and southern Moravia. Its known range includes only western and central Europe (Svensson et al. 2017).
Literature: Svensson M., Ekman S., Klepsland J.T., Nordin A., Thor G., von Hirschheydt G., Jonsson F., Knutsson T., Lif M., Spribille T. & Westberg M. (2017): Taxonomic novelties and new records of Fennoscandian crustose lichens. – MycoKeys 25: 51–86. Aptroot A., Sparrius L.B. & Alvarado P. (2018): Aquacidia, a new genus to accommodate a group of skiophilous temperate Bacidia species that belong in the Pilocarpaceae (lichenized ascomycetes). – Gorteria 40: 11–14.taxonomic classification: most frequented synonyms:Bacidia carneoglauca
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