Rhytidenglerula
Rhytidenglerula Höhn., Sber. Akad. Wiss. Wien, Math. - naturw. Kl., Abt. 1 127: 386 [58 repr.] (1918).
Index Fungorum number: IF 4738; Facesoffungi number: FoF 07965, 9 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on lower surface of living leaves. Colonies superficial, thin, rounded to irregular, brown to dark brown, confluent, velvety, with unicellular hyphopodia. Hyphae long, flexuous reticulately branched, septate, dark brown. Hyphopodia alternate to unilateral, unicellular, ellipsoid, triangular, dark brown, formed laterally, with thick wall. Sexual morph: Ascomata orbicular, yellow to brown, with radiating cells on the upper surface, dissolute at the centre at maturity, small, superficial on radiating, a shield–like plate, solitary, globose to subglobose, light yellow to brown, membranous, irregular on the surface, rounded at the top and containing few asci. Peridium thin, composed of a single layer of yellow cells. Hamathecium with few asci, lacking pseudoparaphyses. Asci 8-spored, bitunicate, obovoid, without pedicel, with rounded base, with an ocular chamber at the apex. Ascospores overlapping, oblong, hyaline, uniseptate, with rounded ends, smooth-walled. Asexual morph: Conidiomata pycnidial, superficial, solitary, globose, dark brown. Conidiomatal wall thin. Conidiophores absent. Conidiogenous cells holoblastic, determinate, discrete, doliiform, hyaline. Conidia ellipsoid, pale brown, uniseptate, base truncate, apex obtuse to conic, obovoid, upper cell small, pale brown, lower cell much larger (adapted from Dai et al. 2014).
Type species: Rhytidenglerula carnea (Ellis & G. Martin) Höhn.
Notes: Rhytidenglerula is characterised by orbicular, yellow to brown ascomata, obovoid, asci lacking a pedicel and oblong, hyaline, uniseptate ascospores. The asexual morph is characterised by pycnidial, superficial, solitary conidiomata, discrete, doliiform, hyaline conidiogenous cells and ellipsoid, pale brown, uniseptate conidia. Rhytidenglerula differs from other members in Englerulaceae in having small yellow ascomata forming on dark hyphae. Rhytidenglerula resembles Schiffnerula in having hyphopodia and globose ascomata, obovoid asci and hyaline ascospores with one septum. Dai et al. (2014) studied the holotype specimen of R. carnea (NY 01089642) and accepted Rhytidenglerula in Englerulaceae based on morphology. Rhytidenglerula is related to the coelomycetous asexual morph in Capnodiastrum and is characterised by holoblastic, doliiform, conidiogenous cells and ellipsoid, pale brown, 1-celled conidia with a conic apex (Sutton 1980, Dai et al. 2014). Rhytidenglerula is a distinct genus in Englerulaceae. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of the genus.
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