Parmulariales » Parmulariaceae

Hysterostomella

Hysterostomella Speg., Anal. Soc. cient. argent. 19(6): 260 (1885).

Index Fungorum number: IF 2476; Facesoffungi number: FoF 02313, 25 morphological species (Species Fungorum 2022), no molecular data available

Parasitic on living leaves. Sexual morph: Internal stromata presence. Ascostromata solitary, scattered or gregarious, superficial, circular or elliptical, becoming irregular, flat, black, opening by irregular fissures, with multi locules. Upper wall of ascostromata comprising several black layers. Hamathecium composed of hyaline, septate, filamentous pseudoparaphyses. Asci 8-spored, bitunicate, subglobose, obovoid, clavate, apedicellate, thick-walled, smooth, with a large apical chamber. Ascospores irregularly arranged, ellipsoidal, uniseptate, with larger upper cell and shorter lower cell, brown to dark brown when mature. Asexual morph: Unknown (adapted from Dai et al. 2020).

Type species: Hysterostomella guaranitica Speg.

Notes: Hysterostomella is characterised by scattered or gregarious, superficial, circular or elliptical ascostromata, subglobose, obovoid, clavate asci and ellipsoidal, uniseptate, brown to dark brown ascospores (Inácio & Cannon 2008). Theissen and Sydow (1915) introduced Hysterostomina which resembles Hysterostomella and accommodated the genus in Polystomellaceae. Doidge (1942) synonymized Hysterostomina under Hysterostomella as he found no significant morphological differences between the two genera. Inácio and Cannon (2008) provided an updated account of Hysterostomella. Dai et al. (2020) re-examined the type specimen H. guaranitica (LPS 1329 holotype, S F20987 and K 180638 isotype) and accepted Hysterostomella as a genus in Parmulariaceae. Hysterostomella is a distinct genus in Parmulariaceae but molecular data is lacking. Fresh collections and DNA sequence data are needed to confirm the taxonomic position of the genus.

 

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