Mycosphaerellales » Mycosphaerellaceae

Scolecostigmina

Scolecostigmina U. Braun, in Braun et al., N.Z. Jl Bot. 37(2): 323 (1999).

Index Fungorum number: IF 28294; Facesoffungi number: FoF 06944, 22 morphological species (Species Fungorum 2022), 2 species with molecular data.

Foliicolous, pathogenic, associated with leaf spots. Mycelium immersed, consisting of septate, branched, pigmented hyphae. Sexual morph: Unknown. Asexual morph: Sporodochia immersed to erumpent; stromata subglobose to applanate, composed of brown, angular to subglobose cells. Conidiophores numerous, densely aggregated, arising from a stroma, subcylindrical or somewhat tapered towards the apex, occasionally ampulliform, continuous or septate, pigmented, wall somewhat thickened, usually verruculose. Conidiogenous cells integrated, terminal or at times conidiophores reduced to conidiogenous cells, holoblastic, proliferating percurrently via conspicuous annellations. Conidia solitary, scolecosporous, usually subcylindrical obclavate, transversely pluriseptate, occasionally with few longitudinal or oblique septa, euseptate, rarely with few intermixed distosepta, thick-walled, pigmented, dark, smooth to verrucose, apex obtuse to subacute, base truncate or obconically truncate, hila unthickened, not darkened; secession schizolytic (adapted from Videira et al. 2017).

 Type species: Scolecostigmina mangiferae (Koord.) U. Braun & Mouch.

Notes: Scolecostigmina comprises taxa of foliicolous stigmina-like hyphomycetes. Scolecostigmina is characterised by immersed to erumpent sporodochia, holoblastic conidiogenous cells, proliferating percurrently via conspicuous annellations, and scolecosporous, usually subcylindrical obclavate conidia with unthickened hila. Braun et al. (1999) could not locate the type material of Cercospora mangiferae but observed other collections and designated specimen CBS H-20846 as neotype. The placement of several species is doubtful as they are not known in culture. Scolecostigmina is a distinct genus in Mycosphaerellaceae but needs revision as numerous species are tentatively placed in the genus. Molecular markers available for Scolecostigmina include ITS, LSU, Actin, TEF-1 and RPB2.

 

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