Pleosporales » Didymellaceae

Didysimulans

Didysimulans Tibpromma, Camporesi & K.D. Hyde, in Tibpromma et al., Fungal Diversity 83: 76 (2017)

Index Fungorum number: IF 552770; Facesofungi number: FoF 2884

Etymology: refers to the didymella-like characteristics. 

Saprobic on dead stems. Sexual morph immersed under the host tissue, solitary, black, globose to irregular, conspicuous at the surface, with or lacking ostioles. Peridium composed of brown cells arranged in a textura angularis. Hamathecium comprising dense, septate, guttulate pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical, slightly curved, short pedicellate, apically rounded. Ascospores 2-celled, hyaline, 1-septate, guttulate, enlarged at the first cell, constricted at the septum, conical at the ends, lacking a mucilaginous sheath. Asexual morph: Chlamydospores occasionally produced, hyaline to yellow–brown mycelium, in spiral chains.

 

Type species: Didysimulans mezzanensis Tibpromma, Camporesi & K.D. Hyde

 

Notes: Didysimulans is introduced as a new genus based on morphology and phylogenetic support (LSU, ITS, RPB2 and b-tubulin DNA sequence data). The ascomata of Didysimulans are similar to those of Didymellaceae in having a peridium of textura angularis and cylindrical asci with 2-celled, hyaline, 1-septate ascospores. Didysimulans produces chlamydospores with hyaline to yellow–brown mycelium, with spiral chains. Leptosphaerulina (muriform ascospores), Platychora (ascospores septate near the lower end), Monascostroma (ascospores narrowly inequilateral), Macroventuria (ascomata with hairs or setae) and Didymella (ovoid to ellipsoidal ascospores) (Hyde et al. 2013), are all easily distinguishable from Didysimulans (Tibpromma et al. 2017).

 

References:

 

Tibpromma S, Hyde KD, Jeewon R, Maharachchikumbura SS et al. 2017 – Fungal diversity notes 491–602: taxonomic and phylogenetic contributions to fungal taxa. Fungal diversity 83, 1-261.

 

Last update: 01 July 2021

 

 

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