Mycosphaerellales » Mycosphaerellaceae

Trochophora

Trochophora R.T. Moore, Mycologia 47(1): 90 (1955).

 Index Fungorum number: IF 10323; Facesoffungi number: FoF 08566, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Foliicolous, but pathogenicity unverified. Sexual morph: Unknown. Asexual morph: Colonies hypophyllous, medium to dark brown, consisting of fasciculate conidiophores or numerous synnemata. Stroma lacking, but with a superficial network of hyphae connecting the various synnemata. Conidiophores fasciculate to synnematous, mostly unbranched and straight, or with 1–2 short branches, straight or curved, cylindrical, individual conidiophores tightly aggregated, but separating near the apex, pale to medium brown, smooth. Conidiogenous cells polyblastic, integrated, terminal, determinate to sympodial, with visible unthickened loci, clavate. Conidia solitary, terminal or lateral on conidiogenous cells, prominently curved to helicoid, pale to medium brown, smooth, transversely euseptate with a darkened, thickened band at the septa (adapted from Videira et al. 2017).

Type species: Trochophora simplex (Petch) R.T. Moore

Notes: Trochophora is characterised by medium to dark brown colonies, fasciculate to synnematous straight conidiophores, polyblastic, integrated, terminal conidiogenous cells, and solitary, curved to helicoid, pale to medium brown conidia. Trochophora is phylogenetically related to Pallidocercospora but the latter is characterised by straight to geniculate–sinuous, olivaceous-brown conidiophores, and guttulate, olivaceous-brown, subcylindrical to narrowly obclavate, multiseptate conidia (Crous et al. 2013). Trochophora is also related to Scolecostigmina but the latter is characterised by holoblastic, proliferating percurrently via conspicuous annellations conidiogeneous cells and scolecosporous or subcylindrical obclavate conidia. Trochophora is morphologically and phylogenetically a distinct genus in Mycosphaerellaceae but with low support. More taxa and collections are needed to justify the placement of Trochophora as a distinct lineage in Mycosphaerellaceae. Molecular markers available for Trochophora are ITS, LSU, Actin, RPB2 and TEF-1.

 

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