Fungalpedia – Note 454, Gyronactis
Gyronactis Ertz & Tehler
Citation when using this data: Tibpromma et al. 2024 (in prep.) – Fungalpedia, Ascomata.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Roccellaceae, Arthoniales, Arthoniomycetidae, Arthoniomycetes, Pezizomycotina, Ascomycota, Fungi.
Gyronactis was introduced as a new genus within Roccellaceae, Arthoniales, in Arthoniomycetes by Ertz et al. (2015), with the type species G. asiatica. Gyronactis asiatica is morphologically similar to Lecanactis elaeocarpa by tomentose ascomata, 3-septate ascospores of similar size, and the presence of lecanoric/gyrophoric acid, L. elaeocarpa has smaller (0.4–0.6 mm) and non-pruinose ascomata, a smooth thallus, and lack of pycnidia (Egea & Torrente, 1994). For this reason, Lecanactis elaeocarpa was combined with Gyronactis as G. elaeocarpa (Ertz et al. 2015). Currently, two species of Gyronactis are recorded in Index Fungorum (2024). Gyronactis is characterized by greyish-green to greyish-brown, verrucose thallus, whitish pruinose ascomata not constricted at the base, tomentose, inconspicuous excipulum, pale brown hypothecium with hyaline hymenium, branched and anastomosing paraphysoids, easily separated, and narrowly clavate asci, with (6–)8-spored, K/I+ blue apical ring and K/I+ blue endoascus, fusiform, and septate ascospores, the presence of numerous dark brown pycnidia producing curved, hyaline to pale brown conidia (Ertz et al. 2015).
Type species: Gyronactis asiatica Ertz & Tehler
Other accepted species: Species Fungorum – search Gyronactis
Figure 1 – Morphology of Gyronactis asiatica. a Appearance of ascomata on substrates. b Longitudinal section through an ascoma with asci. c Ascus. d Ascospore. e Conidia. Scale bars: a = 2 mm, b = 200 μm, c, e = 20 μm, d = 10 μm. Redrawn from Ertz et al. (2015).
References
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 2 December 2024