Nemania
Nemania Gray, Nat. Arr. Brit. Pl. (London) 1: 516 (1821)
Xylariomycetidae, Xylariales, Xylariaceae, Nemania
Index Fungorum number: IF 3437; Facesoffungi number: FoF 03055; 53 morphological species (Species Fungorum 2020); 14 species with sequence data.
Saprobic on plant substrates. Stromata superficial or partially embedded in host tissue, effused-pulvinate, pulvinate, discoid, sometimes applanate, gregarious, solitary or confluent, with sloped or steep margins, unipartite; surface pale white, gray, or grayish brown when young, at length dark brown, blackish brown, or black; mature stromata lacking KOH extractable pigments, plane or with inconspicuous to conspicuous perithecial mounds; carbonaceous tissue directly beneath surface; tissue between the perithecia either carbonaceous and persistent or whitish, soft, becoming grayish brown, and frequently disintegrated with age, made of fungal tissue, host tissue, or both; tissue beneath perithecia inconspicuous or conspicuous, composed of fungal tissue, host tissue, or both. Perithecia spherical, obovoid, monostichous, with carbonaceous stromatal material surrounding individual perithecia when aged in some taxa; ostioles higher than stromatal surface and with openings slightly papillate, or coarsely papillate, with or without encircling disc. Asci 8-spored, cylindrical, short- or long-pedicellate, persistent, with apical ring urn-shaped, inverted hat-shaped, cuneate, or, less often, discoid, and amyloid or dextrinoid in Melzer’s iodine reagent. Ascospores pale brown, brown, dark brown, or blackish brown, bicellular when immature and becoming unicellular when mature, ellipsoidal, cylindrical or fusoid, inequilateral, slightly inequilateral, or nearly equilateral, with acute, barely rounded, or broadly rounded ends, with a straight, conspicuous or inconspicuous germ slit of spore length to much less than spore-length; perispore indehiscent in 10% KOH; epispore smooth or in two taxa striate (adapted from Ju & Rogers 2002).
Type species: Nemania serpens (Pers.) Gray, Nat. Arr. Brit. Pl. (London) 1: 516 (1821)
Notes: Nemania is a species rich and well-established genus in Xylariaceae (Daranagama et al. 2018, Wendt et al. 2018) characterized by stromata not associated with bark rupturing structures, lack KOH-extractable pigments and finely papillate ostioles. Maharachchikumbura et al. (2016) and Réblová et al. (2016) proposed the use of Nemania over Geniculosporium following Stadler et al. (2013). Nemania bipapillata is illustrated in this entry (notes from Hyde et al. 2020).
Species illustrated in this entry:
Nemania bipapillata (Berk. & M.A. Curtis) Pouzar
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