Phyllopsora

The genus was circumscribed by the Swiss botanist Johannes Müller Argoviensis in 1894, with Phyllopsora breviuscula assigned as the type species. In 2019, a proposal was made to conserve the name Phyllopsora against the earlier names Triclinum and Crocynia. This was due to Phyllopsora including species that are the types of these earlier generic names, which would have priority. The proposal argued that conserving Phyllopsora would be the least disruptive option, as taking up Triclinum would require 56 new combinations, while Crocynia included many species now considered to belong to other genera. In 2024, the Nomenclature Committee for Fungi recommended conservation of Phyllopsora against Triclinum and Crocynia, with 80% of the committee voting in favour. Squamacidia was brought into synonymy with Triclinum as a direct result of typification work: Per Magnus Jørgensen lectotypified Triclinum cinchonarum with Fée's protologue figure and epitypified it with a specimen identified as Physcidia endococcina; Brako had earlier treated P. endococcina as a variety of Squamacidia janeirensis, the type species of Squamacidia. This ties T. cinchonarum to the same element that fixes Squamacidia, so Squamacidia falls under Triclinum, with cinchonarum the oldest available epithet. Subsequent phylogenetic work showed T. cinchonarum to be nested within Phyllopsora, which is why treating Triclinum under Phyllopsora also carries Squamacidia into Phyllopsora and motivated the 2019 conservation proposal. ==Description==

The genus Phyllopsora is distinguished by its scale-like () to almost leaf-like (foliose) body (thallus) that often has a distinct border (prothallus). Its reproductive structures, known as asci, have a unique feature: an amyloid dome and a narrow, cone-shaped central structure. The fruiting bodies (apothecia) of this genus are made up of highly gelatinized (jelly-like) fungal threads. These threads show no clear separation between the different structural layers of the apothecium, and this gelatinised texture is consistent throughout the central and marginal areas of the apothecium as well as in the supporting structures (). The produced by Phyllopsora are small, with thin walls, and are typically not divided into separate compartments (rarely septate). ==Species==

, Species Fungorum accepts 48 species of Phyllopsora: • Phyllopsora amazonica • Phyllopsora atrocarpa – Peru • Phyllopsora buettneri • Phyllopsora borbonica • Phyllopsora breviuscula • Phyllopsora castaneocincta • Phyllopsora catervisorediata – India • Phyllopsora chodatinica – Australia • Phyllopsora cinchonarum • Phyllopsora cognata • Phyllopsora concinna • Phyllopsora conwayensis – Australia • Phyllopsora corallina • Phyllopsora dodongensis – South Korea • Phyllopsora dolichospora • Phyllopsora dominicana • Phyllopsora foliata • Phyllopsora foliatella – Australia • Phyllopsora furfuracea • Phyllopsora furfurella • Phyllopsora glaucella • Phyllopsora glaucescens – Peru • Phyllopsora gossypina • Phyllopsora himalayensis – India • Phyllopsora hispaniolae • Phyllopsora homosekikaica – Australia • Phyllopsora imshaugii • Phyllopsora isidiosa • Phyllopsora lividocarpa – Peru • Phyllopsora loekoesii • Phyllopsora magna • Phyllopsora methoxymicareica – Australia • Phyllopsora nemoralis • Phyllopsora neofoliata – Australia • Phyllopsora neotinica • Phyllopsora nigrocincta – Peru • Phyllopsora parvifolia • Phyllopsora phaeobyssina • Phyllopsora pocsii • Phyllopsora pseudocorallina – Asia; Africa • Phyllopsora pyxinoides • Phyllopsora rappiana – Australia • Phyllopsora rosei – Europe • Phyllopsora sabahana – Malaysia • Phyllopsora siamensis – Thailand • Phyllopsora soralifera – Peru • Phyllopsora subhyalina • Phyllopsora swinscowii • Phyllopsora teretiuscula • Phyllopsora tobagensis ==References==