Muyocopronales Mapook, Boonmee & K.D. Hyde, ord. nov., Index Fungorum number: IF551615
Type family: Muyocopronaceae (see Hyde et al. 2013 for description)
Saprobic, common on the surface of dried twigs, less common on leaves. Sexual morph: Ascomata superficial, coriaceous, appearing as circular, flattened, brown to dark brown spots covering the host, without a subiculum, with a poorly developed basal layer. Ostiole central without setose or hairy appendages. Peridium mostly comprising pseudoparenchymatous cells of textura angularis. Hamathecium comprising filiform, septate, branched, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, saccate or broadly obpyriform, sometime oval to obovoid, with or without an ocular chamber. Ascospores multi-seriate to irregularly arranged, hyaline, oval to obovoid with obtuse ends, aseptate with or without granular appearance. Asexual morph: Undetermined.
Notes:—Muyocopronales forms a distinct order in the clade comprising Acrospermales and Dyfrolomycetales (Fig. 1). The three orders differ as follows: Acrospermales (type Acrospermum) has club-shaped, coriaceous ascomata, with narrow cylindrical asci, with the longest asci more than 1,000 μm, and filiform, multi-septate ascospores (Riddle 1920, Minter et al. 2007, Hyde et al. 2013); Dyfrolomycetales (type Dyfrolomyces) has immersed, coriaceous ascomata, with uniseriate, broadly fusiform multi-septate ascospores (Pang et al. 2013, Hyde et al. 2013). Muyocopronales (type Muyocopron) has superficial, flattened, carbonaceous, brittle ascomata, pseudoparaphyses that are longer than the asci and ellipsoidal to ovate, unicellular ascospores (Hyde et al. 2013).
Fig. 1. Phylogram generated from RAxML based on combined LSU and SSU sequence data to establish the new order Muyocopronales. Bootstrap support values for maximum likelihood (ML, red) greater than 60% are given above the nodes and Bayesian posterior probabilities (PP, black) equal to or greater than 0.95 are indicated above the nodes. The ex-type and reference specimens are in bold.