Nimesporella Réblová & Hern.-Restr., gen. nov.
MycoBank number: MB 842002; Index Fungorum number: IF 842002; Facesoffungi number: FoF;
Type species: Nimesporella capillacea Réblová & Hern.-Restr.
Etymology: An anagram of Menisporella, a synonym of Codinaea.
Description: Colonies effuse, brown, composed of conidiophores, mycelium immersed. Anamorph: Setae absent. Conidiophores macronematous, mononematous, single or in groups, erect, straight or flexuous to geniculate in the upper part, unbranched, septate, smooth, brown, paler toward the apex. Conidiogenous cells integrated, terminal, polyphialidic, extending sympodially, paler than the conidiophore, often with persistent remnants of the collarettes; collarettes flared, soon evanescent. Conidia ellipsoidal, rounded at the apical end, papillate at the basal end, aseptate, hyaline, with a straight or gently curved setula at each end, basal setulae positioned ventrally, conidia accumulate in slimy whitish fascicles. Teleomorph: Unknown.
Habitat and geographical distribution: Nimesporella occurs on decaying plant material in freshwater and terrestrial habitats, and it is known from Africa.
Notes: – Nimesporella capillacea is the only species of the genus available to represent this uncommon morphotype in the present phylogeny. It forms a basal lineage to the Codinaea clade but their relationship is not statistically well supported. Nimesporella differs from Codinaea mainly by the characters of conidiogenous cells with multiple phialidic apertures, early evanescent collarettes and papillate, broadly ellipsoidal conidia with a simple setula at each end, inserted terminally at the apex and somewhat ventrally at the base. When grown in culture, the phialides extend sympodially for a short distance, producing densely aggregated phialidic openings encircled by tubular, apically flared collarettes. Similar polyphialides were also recorded in Multiguttulispora [49].
Species such as Dictyochaeta aliformis, D. daphnioides and D. tumidospora known only from Southeast Asia from Malaysia [22] bear a striking resemblance to N. capillacea in all characteristics. On material from nature [22], conidiogenous cells frequently elongate sympodially, while internally septa may be formed. As a result, 1–2 intercalary phialidic openings are formed per each cell in the upper part of the conidiophore. After careful comparison of their original descriptions and illustrations with N. capillacea we suggest that they are likely congeneric. Their transfer to Nimesporella should be supported by DNA data, which are unavailable for study at the moment. The strain of N. capillacea was originally deposited under the name D. daphnioides.
Species