Fungalpedia – Note 461, Psoronactis
Psoronactis Ertz & Tehler
Citation when using this data: Tibpromma et al. 2024 (in prep.) – Fungalpedia, Lichenicolous fungi.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Roccellaceae, Arthoniales, Arthoniomycetidae, Arthoniomycetes, Pezizomycotina, Ascomycota, Fungi.
Based on phylogenies of combined LSU and RPB2 sequences, Ertz et al. (2015) introduced Psoronactis as a monotypic genus within Roccellaceae and Arthoniales in Arthoniomycetes with the type species P. dilleniana. The species was initially described as Lecanactis dilleniana by Körber (1885), but the genus can differ from Lecanactis species by chemistry, with psoromic and 2′-O-demethylpsoromic acids in the thallus (Ertz et al. 2015). Psoronactis is characterized by thallus crustose, non-corticate, non-sorediate, apothecioid, rounded ascomata, sessile, black, with a persistent, dark brown excipulum, with individual hyphae hardly visible except in the external part, K+ olivaceous, carbonized hypothecium and thick, scarcely ramified and anastomosed paraphysoids, with slightly enlarged and brown apices, cylindrical-clavate asci with hyaline to fusiform ascospores, straight or slightly curved, 3-septate. The pycnidia were immersed or semi-immersed in the thallus, punctiform, with a dark brown wall and straight conidia (Ertz et al. 2015). No other species have been introduced to this genus, which remains monotypic.
Type species: Psoronactis dilleniana (Ach.) Ertz & Tehler
Other accepted species: This genus is monotypic.
Figure 1 – Morphology of Psoronactis dilleniana. a Appearance of ascomata on substrates. b Ascospores. Scale bars: a = 2000 μm, b = 10 μm. Redrawn from Ertz et al. (2015).
References
Körber GW. 1855 – Systema lichenum Germaniae. :1-458
Entry by
Lu L, Center for Yunnan Plateau Biological Resources Protection and Utilization, College of Biological Resource and Food Engineering, Qujing Normal University, Qujing, Yunnan 655011, China; Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand.
(Edited by Saowaluck Tibpromma, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)
Published online 3 December 2024