Pleosporales » Pleosporales, genus incertae sedis


Megacapitula J.L. Chen & Tzean, Mycol. Res. 97(3): 347 (1993).

Index Fungorum number: IF 25546; Facesoffungi number: FoF xx, 1 morphological species (Species Fungorum 2022), molecular data unavailable.

Saprobic on host. Asexual morph: Mycelium composed of branched, septate, smooth, roughened, verrucose, hyaline or pigmented hyphae. Conidiophores micronematous. semimacronematous, mononematous, simple or branched, pale brown to brown, smooth, roughened or verrucose. Conidiogenous cells integrated, terminal, lateral or rarely intercalary, determinate. Conidia holoblastic, solitary, ovoid, obclavate, ellipsoidal or obpyriform, muriform, pigmented with densely packed, branched or unbranched, hair-like appendages at the apex. Sexual morph: Unknown (Adapted from Chen and Tzean 1993).


Type species: Megacapitula villosa J.L. Chen & Tzean


Notes: Megacapitula was introduced by Chen and Tzean (1993) with M. villosa as type species. Megacapitula is characterized by verrucose, hyaline or pigmented mycelium, integrated, terminal conidiogenous cells and holoblastic, solitary, ovoid, obclavate, ellipsoidal or obpyriform conidia with hair-like appendages at the apex. Megacapitula resembles Chaetomium in having similar size, shape and appendages of the conidia (Ames 1961; Chen and Tzean 1993). Megacapitula is also similar to Akenomyces in having pyriform sclerotia covered with simple, curved or sinuate, colourless hairs but the latter is the anamorph of a basidiomycete (Hornby 1984).  Megacapitula is placed in Pleosporales, genera incertae sedis but the familial rank is still uncertain.  Molecular markers are lacking for Megacapitula. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of the genus.


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