Lirellodisca
Lirellodisca Aptroot, in Aptroot & Iperen, Nova Hedwigia 67(3-4): 485 (1998).
Index Fungorum number: IF 27901; Facesoffungi number: FoF 00355, 1 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on twigs of Elaeocarpus sp. in terrestrial habitat. Sexual morph: Ascomata apothecial, solitary, scattered, erumpent in bark, superficial, subglobose, deeply cup-shaped, with rim slightly raised over the centre, thick-walled, black. Exciple composed of 2 layers, outer cell layer pseudoparenchymatous, black, inner cell layer comprised thick-walled isodiametric cells, continuous from the base to the margin, with gelatinized, light brown to colorless cells. Hamathecium composed of up to 1 µm wide, filamentous, individual, apically branched, hyaline, pseudo paraphyses, embedded in a gelatinous matrix, forming a pale brown epithecium. Asci 8-spored, bitunicate, cylindrical to oblong, slightly broad on the apex, narrow in the lower part, long pedicellate, with indistinct ocular chamber. Ascospores 2-seriate, ellipsoidal, curved, rounded at the ends, mostly with 6-transverse distosepta, cells with reduced cell-lumen, hyaline, smooth-walled. Asexual morph: Unknown (adapted from Yacharoen et al. 2015).
Type species: Lirellodisca pyrenulispora Aptroot
Notes: Lirellodisca is characterised by superficial, subglobose ascomata, cylindrical to oblong asci and ellipsoidal, curved ascospores. Lirellodisca resembles members of Arthoniales but can be differentiated based on the cup-shaped ascomata and thick-walled distoseptate ascospores. Yacharoen et al. (2015) examined the holotype specimen of L. pyrenulispora (CBS H-6148) and accepted Lirellodisca as a genus in Patellariaceae. Lirellodisca is a distinct genus in Patellariaceae but molecular data is needed to confirm this taxonomic placement.
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