Fungalpedia – Note 455, Ocellomma
Ocellomma 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 phylogeny of combined LSU and RPB2 sequences, Ocellomma formed a separate lineage from Diromma and Schismatomma (in Roccellaceae) (Ertz et al. 2014). Ertz et al. (2014) introduced Ocellomma as a distinct genus within Roccellaceae and typified by O. picconianum, this species had initially been described as Lecania picconiana by Baglietto (1862). Ocellomma comprises only two species: O. picconianum and O. rediuntum (Ertz et al. 2015, Kantvilas et al. 2020). Members of Ocellomma are isolated from different hosts with sexual and asexual morphs, and they are mainly distributed in Italy and Southern California as lichens (Tehler 1993, Ertz et al. 2014, Kantvilas et al. 2020). Ocellomma sexual morph is characterized by thallus crustose ecorticate. Photobiont trentepohlioid. Ascomata erumpent and scattered, containing calcium oxalate, with hyaline to brown hypothecium, K+ olive and KI+ violet, branched paraphysoids, myrticola-type asci containing 8-spored with hyaline and fusiform ascospores, 3-septate and without a gelatinous sheath (Ertz et al. 2014, Kantvilas et al. 2020). The asexual morph is characterized by numerous pycnidia, visible as black, semi-immersed, bacilliform conidia, straight or curved (Ertz et al. 2014, Kantvilas et al. 2020).
Type species: Ocellomma picconianum (Bagl.) Ertz & Tehler
Other accepted species: Species Fungorum – search Ocellomma
Figure 1 – Morphology of Ocellomma. a, b Appearance of ascomata on substrates with whitish margins. c Ascus. d Ascospores and conidia. Scale bars: b = 1 mm, c, d = 10 μm. Redrawn from Ertz et al. (2014) and Kantvilas et al. (2020).
References
Tehler A. 1993 – The genus Schismatomma (Arthoniales, Euascomycetidae). Opera Botanica 118, 1–38.
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 29 November 2024