Mycosphaerellales » Mycosphaerellaceae

Microcyclus

Microcyclus Sacc., Syd. & P. Syd., in Sydow & Sydow, Annls mycol. 2(2): 165 (1904).

Index Fungorum number: IF 3160; Facesoffungi number: FoF 08627, 23 morphological species (Species Fungorum 2022), 1 species with molecular data.

Biotrophic on leaves and stems. Sexual morph: Ascostromata pulvinate, irregularly shaped, developing from central basal hypostroma, superficial, multilocular, composed of textura angularis, thick-walled, reddish brown. Ostiole papillate, periphysate. Asci 8-spored, thick-walled, bitunicate, fissitunicate, cylindrical to clavate, with an ocular chamber, with a long pedicel. Ascospores 1–3-seriate, uniseptate, obovoid, upper cell shorter and wider than lower, not or slightly constricted at the septum, smooth wall, granular, hyaline. Asexual morph: Unknown (adapted from Videira et al., 2017).

 Type species: Microcyclus angolensis Sacc., Syd. & P. Syd.

Notes: Microcyclus is characterised by pulvinate, irregularly shaped ascostromata, papillate, periphysate ostiole, cylindrical to clavate asci and 3-seriate, uniseptate, obovoid ascospores. Theissen and Sydow (1915) and Müller and Sanwal (1954) described M. angolensis as having periphysate ostioles. Barr (1996) placed Microcyclus in Planistromellaceae based on the erumpent, multiloculate ascostromata, and uniseptate and obovoid ascospores. Monkai et al. (2013) re-examined the holotype of M. angolensis (F8592 and F8593) and transferred Microcyclus to Mycosphaerellaceae based on the asci and ascospores characters. The placement of Microcyclus in Mycosphaerellaceae is doubtful. Molecular markers available for Microcyclus are ITS, LSU, SSU, Actin and TEF-

 

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