Pseudoschismatomma

Fungalpedia – Note 497, Pseudoschismatomma

 

Pseudoschismatomma 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.

 Pseudoschismatomma was proposed as a monotypic genus within Roccellaceae, Arthoniales as Arthoniomycetes by Ertz et al. (2014), and P. rufescens as the type species. This species was initially described as Opegrapha rufescens by Persoon (1794). Pseudoschismatomma rufescens morphologically resembles Schismatomma graphidioides, but P. rufescens has a distinct brown true exciple and the ascospores are shorter (16–27×3–5 μm) than S. graphidioides (ascospores 24–36 (-40) × (2.5-) 3–3.5 μm) (Ertz et al. 2014, Cannon et al. 2021). Pseudoschismatomma is characterized by small, immersed, often slightly raised apothecia with a fully exposed disc, a thin true exciple that is often surrounded by a thin whitish pseudothalline margin, and curved, fusiform, and septate ascospores (Ertz et al. 2014, Cannon et al. 2021). The genus has never been reported in chemical reactions (Cannon et al. 2021). No other species have been introduced to this genus, which remains monotypic.

Type species: Pseudoschismatomma rufescens (Pers.) Ertz & Tehler

Other accepted species: This genus is monotypic.

 

Figure 1 – Morphology of Pseudoschismatomma rufescens. a Appearance of ascoma on substrates. b Longitudinal section through an ascoma with asci. c Ascospores. Scale bars: a = 1000 μm, b = 100 μm, c = 5 μm. Redrawn from Ertz et al. (2015).

 

References 

Cannon P, Aptroot A, Coppins B, Ertz D. et al. 2021 – Arthoniales: Roccellaceae including the genera Cresponea, Dendrographa, Dirina, Enterographa, Gyrographa, Lecanactis, Pseudoschismatomma, Psoronactis, Roccella, Schismatomma and Syncesia. [” Revisions of British and Irish Lichens”], 16.

Ertz D, Tehler A, Irestedt M, Frisch A. et al. 2014 – A large-scale phylogenetic revision of Roccellaceae (Arthoniales) reveals eight new genera. Fungal Diversity 70, 31–53.

Persoon CH. 1794 – Einige Bemerkungen über die Flechten: Nebst Beschreibungen einiger neuen Arten aus dieser Familie der Aftermoose. Ann. Bot.(Usteri) 7, 1–32.

 

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

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