Neocatenulostroma
Neocatenulostroma Quaedvl. & Crous, in Quaedvlieg et al., Persoonia 33: 26 (2014).
Index Fungorum number: IF 807805; Facesoffungi number: FoF 07021, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.
Plant pathogenic (foliicolous) and saprobic. Mycelium immersed, pale brown, septate, smooth. Sexual morph: Ascomata amphigenous, immersed, substomatal, subepidermal, with small or no papilla, globose to slightly subglobose, with periphysate central ostiole. Peridium comprising two strata, the outer stratum of thick-walled, medium brown small-celled textura angularis, becoming thinner-walled and hyaline in the inner stratum. Asci obclavate to globose, bitunicate, sessile, narrowing to a rounded apex, 8-spored. Ascospores broadly fusiform, medianly uniseptate, hyaline to pale brown, smooth, eguttulate, with obtuse apices, with or without a mucilaginous sheath. Asexual morph: Colonies sporodochial, pulvinate, dry, dark brown to black. Conidiophores macronematous, mainly straight, caespitose, closely packed, emerging through stomata forming the sporodochia, short, smooth, olivaceous-brown. Conidiogenous cells irregularly cylindrical, terminal, holoblastic, delimitation of conidium by a single septum, with retrogressive delimitation of next conidium, giving an unconnected chain of conidia, secession schizolytic. Conidia variously shaped, cylindrical, Y-shaped, ellipsoidal, straight or curved, with rounded or truncated apices, catenate in branched basipetal chains, which are schizogenous, olivaceous to red-brown, multiseptate, with transverse and often longitudinal or oblique septa (adapted from Quaedvlieg et al. 2014).
Type species: Neocatenulostroma microsporum (Joanne E. Taylor & Crous) Quaedvl. & Crous
Notes: Neocatenulostroma differs from Catenulostroma s. str. in having chains of irregularly branched conidia with transverse, longitudinal or oblique septa, variously shaped, from cylindrical to Y-shaped or ellipsoidal while Catenulostroma s. str. has colonies that produce muriform eu- or distoseptate conidia in branched chains. Neocatenulostroma is morphologically and phylogenetically a distinct genus in Teratosphaeriaceae. Molecular markers available for Neocatenulostroma are ITS, LSU, SSU, Actin, BTUB, Calmodulin, RPB2 and TEF-1.
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