Dothideomycetes » Dothideomycetes, genera incertae sedis

Isomunkia

Isomunkia Theiss. & Syd., Annls mycol. 13(3/4): 261 (1915).

Index Fungorum number: IF 2513; Facesoffungi number: FoF 12246, 1 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on host. Sexual morph: Stromata scattered, regularly circular or broadly elliptical in outline, flatly convex, protruding, subcuticular to the epidermis. Peridium comprising several layers of radially short-limbed, black-brown hyphae, appearing pseudoparenchymatic on cross-sections. The basal layer and the stromal tissue between the loculi are fibrous, indistinctly small-celled, hyaline, often very light yellowish underneath. Loculi numerous, densely single-layered, forming round or broadly ovoid cavities in the hyaline inner tissue, with atypical, papillae-shaped ingrown into the outer layer, closed by vertically fibrous hyaline tissue. Paraphyses quite numerous, filamentous. Asci clavate-cylindrical, often somewhat sac-like widened below, almost sessile, 8-spored, coarse and thick-walled. Ascospores elongate, septate about the middle, hyaline. Asexual morph: Unknown (adapted from Theissen & Sydow 1915).

 Type species: Isomunkia pulvinula (Pat.) Theiss. & Syd.

Notes: Isomunkia is characterised by scattered, regularly circular or broadly elliptical stromata, numerous, loculi, clavate-cylindrical, sac-like asci and elongate, septate about the middle, hyaline ascospores. Molecular data is lacking. Kirk et al. (2013), and Wijayawardene et al. (2017, 2020) referred Isomunkia to Dothideomycetes genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of Isomunkia.

 

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