Phaeomycocentrospora

PhaeomycocentrosporaCrous, H.D. Shin & U. Braun, in Crous et al., Stud. Mycol. 75: 61 (2012) [2013].

Index Fungorum number: IF 564813;Facesoffungi number: FoF 07939, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Foliicolous, pathogenic, causing discrete leaf spots.Mycelium internal and external, consisting of hyaline, septate, branched, smooth, 3–5 μm diam. hyphae; hyphopodium-like structures present.Caespituliamphigenous.Sexual morph: Unknown.Asexual morph:Conidiophores in loose fascicles, arising from a poorly developed stroma, or from superficial hyphae emerging from stomata, or erumpent through the cuticle; erect on superficial hyphae, olivaceous-brown, straight to slightly curved, unbranched, not geniculate, obconically truncate at the apex; conidiogenous cells integrated, terminal or conidiophores reduced to conidiogenous cells, mono- to polyblastic, proliferating sympodially, transversely septate; conidiogenous loci broad, more or less planate, neither thickened nor darkened.Conidia solitary, filiform to cylindrical, straight to moderately curved, subhyaline to pale olivaceous, transversely euseptate, usually not constricted at septa, tapering somewhat towards an obtuse apex, truncate at the base; hilum unthickened, not darkened, broad (adapted fromCrous et al. 2013).

 Type species:Phaeomycocentrospora cantuariensis(E.S. Salmon & Wormald) Crous, H.D. Shin & U. Braun

Notes:Phaeomycocentrospora is characterized by olivaceous-brown, straight to slightly curved conidiophores, mono- to polyblastic conidiogenous cells, filiform to cylindrical, straight to moderately curved conidia.PhaeomycocentrosporaresemblesPseudocercospora in having pigmented conidia and conidiophores and conidiogenous loci are unthickened and not darkened.Phaeomycocentrospora differs fromPseudocercospora in having hyaline mycelium, hyphopodia-like structures and hyaline conidia with a pale brown inner wall layer.Phaeomycocentrospora also has larger conidial loci and scars which are absent inPseudocercospora.Phaeomycocentrospora cantuariensis was previously placed in Mycocentrospora byDeighton (1971, 1972) however, the type speciesM. acerina differs from the former species in having conidia with filiform appendages and often with strongly swollen intercalary cells.Phaeomycocentrospora is a distinct and well-defined genus inDothidotthiaceae. Molecular markers available forPhaeomycocentrospora are ITS, LSU, Actin, BTUB and TEF-1.

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