Muyocopron Speg., Anal. Soc. cient. argent. 12(3): 113 (1881)

Index Fungorum number: IF3294

Possible synonyms (from Index Fungorum 2016)

Saprobic on the surface of dried leaves or twigs. Sexual morph: Ascomata superficial, solitary or scattered, coriaceous, appearing as circular, scattered, flattened, brown to dark brown spots covering the host, without a subiculum, with a poorly developed basal layer and an irregular margin. Ostiole central. Peridium 10–40 µm wide, outer layer comprising dark-brown to black pseudoparenchymatous cells of textura angularis, inner layer comprising light brown cells of textura angularis. Hamathecium comprising 1.5–3 µm wide, cylindrical to filiform, septate pseudoparaphyses. Asci 8-spored, bitunicate, saccate or broadly obpyriform, pedicellate, straight or slightly curved, with small ocular chamber. Ascospores irregularly arranged, hyaline, oval to obovoid with obtuse ends, aseptate, with granular appearance. Asexual morph: Undetermined.

Type species: Muyocopron corrientinum

Speg.See Wu et al. (2011b) for description and illustration.

Notes: Muyocopron was introduced by Spegazzini (1882) to accommodate M. corrientinum as the type species. The genus is characterized by small, superficial, black spots, without mycelium, dimidiate-scutate, subcarbonaceous ascomata with centrally ostiole, bitunicate, 8-spored asci, and ellipsoidal, hyaline ascospores (Spegazzini 1882, Mapook et al. 2016). Muyocopron species occur worldwide and are associated with a wide variety of plant substrates (Mapook et al. 2016, Tibpromma et al. 2016b, Senwanna et al. 2019b). There are 48 Muyocopron species listed in Species Fungorum (2020). In this study, we introduce a new species, Muyocopron cinnamomi from dead leaves of Cinnamomum kotoense (Lauraceae) and a new host record of Muyocopron dipterocarpi from Celtis formosana (Cannabaceae).

Phylogram generated from maximum likelihood analysis based on combined LSU, SSU and ITS sequence data. Fifty strains are included in the combined analyses which comprised 2745 characters (871 characters for LSU, 1109 characters for SSU, 765 characters for ITS) after alignment. The GTR+I+G was applied as the evolutionary model for all the gene regions. Tree topology of the maximum likelihood analysis is similar to the Bayesian analysis. The best RaxML tree with a final likelihood value of -15675.083415 is presented. Estimated base frequencies were as follows: A = 0.240159, C = 0.243562, G = 0.294893, T = 0.200000; substitution rates AC = 1.621279, AG = 2.691558, AT = 1.673290, CG = 1.290027, CT = 1.290027, GT = 1.000000; gamma distribution shape parameter a = 0.524676. Bootstrap support values for ML greater than 75% and Bayesian posterior probabilities greater than 0.95 are given near nodes respectively. The tree is rooted with Lophium mytilinum (AFTOL-ID 1609) and Mytilinidion rhenanum (CBS 135.45). Ex-type strains are in bold and black. The newly generated sequences are in yellow.