Medeolariales » Dermateaceae

Neodermea

Neodermea W.J. Li, D.J. Bhat & K.D. Hyde, gen. nov.

Index Fungorum number: IF557151, Facesoffungi number: FoF 07471

Etymology: Named after its morphology similar to Dermea.

Leotiomycetes, Leotiomycetidae, Medeolariales, Dermateaceae

 

Saprobic on plant host. Sexual morph: Apothecia black or drak brown, solitary or gregarious, erumpent, circular or undulate, sessile, narrowed below, leathery to horny in consistency, becoming more fleshy-leathery when moist. Hymenium at first concave, becoming plane or slightly convex, the margin at first thick, raised, later almost disappearing. Paraphyses hyaline, filiform, branched, septate, apex slightly swollen and glued together forming a yellowish epithecium. Tissue of hypothecium compact, pseudoparenchymatous, brownish. Asci 8-spored, cylindrical to clavate, short, stalked. Ascospores hyaline when young, becoming yellowish at maturity, uniseriate to biseriate, oblong-ellipsoid to ellipsoid-fusiform, 1–3-septate, straight or slightly curved (adapted from Grove 1946). Asexual morph: Conidiomata dark brown to black, stomatic, pycnidial, solitary or gregarious, immersed to semi-immersed, erumpent, globose to subglobose, unilocular or multi-locular, thick-walled, ostiolate. Ostiole cylindrical, single, with wide channel, centrally located. Conidiomata wall composed of hyaline to brown, thick-walled cells of textura angularis. Conidiophores arising from the innermost wall layer of conidiomata, hyaline, cylindrical, septate. Conidiogenous cells enteroblastic, phialdic, cylindrical, usually integrated, determinate, smooth. Conidia hyaline, oblong-ellipsoid, rounded at both ends, or with a narrow and truncate base, straight or slightly curved, unicellular, guttulate, smooth-walled. Microconidia absent or present, hyaline, filiform, aseptate, straight or curved.

 

Type species: Neodermea rossica W.J. Li, D.J. Bhat & K.D. Hyde, sp. nov.

 

Notes: Dermea acerina (Peck) Rehm was introduced by Peck (1878) as Tympanis acerina Peck based on morphology of apothecia. Subsequently, Saccardo (1889) transferred D. acerina to Scleroderris (Fr.) Bonord., although it differs from Scleroderris species in oblong-ellipsoid to ellipsoid-fusiform ascospores (Grove 1946). Rehm (1912) transferred it to Dermea based on characters of apothecia, asci and ascospores. However, D. acerina has oblong-ellipsoid conidia, which is similar in form to conidia of Pezicula species, rather than D. cerasi (elongate-fusiform to subfiliform conidia), and this has resulted in a confusion of the generic concept. Groves (1938, 1941) established the connection between D. cerasi and Naemosphaera acerina (Peck) Höhn., based on culture studies. A phylogenetic tree for Dermateaceae based on multi-locus sequence data shows that D. acerina CBS 161.38 is distinct from D. cerasi and forms a separate clade with two new collections. Neodermea is introduced as a new genus to accommodate N. acerina and N. rossica. Neodermea rossica is designated as the type species.

 

Distribution: Canada, Italy, USA (Grove 1946, Verkley et al. 2003, this study)

 

 

 

 

References:

 

Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.

 

 

 

 

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