Stenella
Stenella Syd., Annls mycol. 28(1/2): 205 (1930).
Index Fungorum number: IF 10082; Facesoffungi number: FoF 08506, ca. 150 morphological species (Species Fungorum 2022), 1 species with molecular data.
Pathogenic on leaf. Leaf spots hypophyllous, irregular to sub circular, indistinct, yellow to pale brown with indistinct margins, lesions are amphigenous, and fascicles and sporodochia are rare, with superficial mycelium being predominant. Sexual morph: Unknown. Asexual morph: Mycelium consisting of internal and external, medium brown, septate, branched, verruculose, 3–4 µm wide hyphae. Caespituli fasciculate to sporodochial, hypophyllous, medium brown. Conidiophores arising singly from superficial mycelium, or aggregated in loose to dense fascicles arising from the upper cells of a brown stroma. Conidiophores medium brown, finely verruculose, 1–5- septate, subcylindrical, straight to geniculate-sinuous, unbranched or branched. Conidiogenous cells terminal or lateral, unbranched, medium brown, finely verruculose, tapering to slightly or flat-tipped loci, proliferating sympodially. Scars thickened, darkened and refractive. Conidia solitary or catenate, in simple chains, medium brown, verruculose, subcylindrical to narrowly obclavate, apex obtuse, base bluntly rounded with truncate hilum, straight, 0–3-septate, hila thickened, darkened, refractive (adapted from Crous et al. 2007).
Type species: Stenella araguata Syd.
Notes: Stenella araguata was mistaken as Cladosporium by Arx (1974). Stenella morphologically resembles Passalora but differs in having verruculose hyphae. Stenella was previously used for asexual morphs of Mycosphaerella (Crous et al. 2004, 2006c). The epitype of Stenella araguata was designated by Crous et al. (2007). Quaedvlieg et al. (2014) showed that Stenella belongs to Teratosphaeriaceae and is paraphyletic within the order Capnodiales. Molecular markers available for Stenella are ITS, LSU, SSU, Actin, GAPDH and RPB2.
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