Dothideomycetes families incertae sedis » Polystomellaceae

Munkiella

Munkiella Speg., Anal. Soc. Cient. Argent. 19(6): 248 (1885).

Index Fungorum number: IF 3288; Facesoffungi number: FoF 06493, 1 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on host. Sexual morph: Stroma black, crust-shaped develop mainly between the cuticle and epidermis. Hyaline hyphae penetrate deeper into the substrate. The top layer of the stroma consists of several layers of small, irregularly angular or elongated at the edge, indistinctly arranged, rough-walled. Basal layer and the interior of the stroma hyaline, indistinct small cells somewhat slimy. Depressed, rounded loculi arise in a single layer, which break through the top layer with their papillary apex. Ostiole neck filled with numerous paraphysoids. Asci 8-spored, clavate to cylindric clavate, bitunicate, thick but smooth-walled with a distinct ocular chamber. Ascospores hyaline, one septate. Asexual morph: Unknown (adapted from Spegazzini 1885).

 Type species: Munkiella caa-guazu Speg.

Notes: Munkiella is characterised by black, crust-shaped stroma, clavate to cylindric clavate, bitunicate asci and hyaline, one septate ascospores. Theissen and Sydow (1915) described Munkiella as Coscinopeltis while Petrak (1929 and 1951) described it as Apiotrabutia and Coscinopeltis. Spegazzini (1885) reported that the stroma of M. caa-guazu is mostly epiphyllic and more rarely hypophyllic. The peridium comprised several layers of brown-walled or reddish, rough-walled, with irregularly angular or elongated cells (textura angularis). Spegazzini (1885) suggested the placement of Munkiella in Pseudosphaeriales and mentioned that the genus might be related to Dothidella. Lumbsch and Huhndorf (2010), Hyde et al. (2013) and Wijayawardene et al. (2014) referred Munkiella to Polystomellaceae, Dothideomycetes families incertae sedis. Munkiella is a distinct genus in Polystomellaceae but lacks molecular data. Fresh specimens with DNA sequence data are needed to confirm the generic placement of Munkiella.

 

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