Dothideomycetes » Dothideomycetes, genera incertae sedis

Dictyoasterina

Dictyoasterina Hansf., Proc. Linn. Soc. London 159: 39 (1947).

Index Fungorum number: IF 1525; Facesoffungi number: FoF 12187, 1 morphological species (Species Fungorum 2022), no molecular data available.

Epiphytic on the upper surface of leaves, appearing as blackened areas, which are rounded and shiny, scattered over the leaf, with superficial hyphae present, forming a black mycelia net. Sexual morph: Epiphytic on the upper surface of leaves, appearing as blackened areas, which are rounded and shiny, scattered over the leaf, with superficial hyphae present, forming a black mycelia net. Superficial hyphae, black to brownish, parallel and anastomosing, with sparse, lateral hyphopodia, hyphopodia nearly circular, black-brown. Ascomata superficial, gregarious, roughly globose, black, subcoriaceous or less carbonaceous, with a central ostiole. Peridium comprised of three layers of cells, black-brown to pale brown, outer layer of black brown cells compressed, inner layer of isodiametric cells of textura epidermoidea. Hamathecium of dense, long pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, clavate to short cylindrical, with a short knob-like pedicel and inconspicuous apical structure. Ascospores biseriate to overlapping triseriate, oblong-ellipsoid to obovate, 1-septate, hyaline, strongly constricted at the septum, upper cell oval, wider and shorter than the cone-shaped lower cell, guttulate, smooth-walled. Asexual morph: Unknown (adapted from Wu et al. 2010).

Type species: Dictyoasterina conopharyngiae Hansf.

Notes: Dictyoasterina is characterised by roughly globose, black, subcoriaceous ascomata, clavate to short cylindrical asci and oblong-ellipsoid to obovate, uniseptate, hyaline ascospores. Hansford (1947) placed Dictyoasterina in Asterinaceae. Lumbsch and Huhndorf (2007) transferred Dictyoasterina to Microthyriaceae. Dictyoasterina differs from members of Microthyriaceae in having superficial mycelium and clearly ostiolate, globose ascomata. Wu et al. (2011) excluded Dictyoasterina from Microthyriaceae and transferred it to Dothideomycetes genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm the generic placement of Microthyriaceae.

 

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