Ligniella
Ligniella Naumov, Mater. Mikol. Fitopat. Ross. 5(1): 5 (1926)
Index Fungorum number: IF 8777
Ascomycota, genera incertae sedis
Saprobic on wood of Betula sp. (Betulaceae). Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, stromatic, pycnidial, scattered, initially immersed, then erumpent and appearing superficial, irregular, pulvinate, rugose, multilocular, glabrous. Ostiole single to each locule, circular, centrally located. Conidiomatal wall composed of thick-walled, dark brown cells of textura globulosa in the exterior, gradually merging with pale brown cells of textura globulosa to textura epidermoidea towards the inner layer at the basal stroma, becoming hyaline cells of textura angularis in the locular wall. Conidiophores formed from the inner layer cells of locular wall, hyaline, cylindrical or irregular, simple or branched, septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, phialidic, ampulliform to cylindrical, discrete, determinate, smooth-walled. Conidia hyaline, cylindrical or bacilliform, unicellular, smooth-walled.
Type species: Ligniella atrata Naumov, Mater. Mycol. Phytopath. Leningrad 5(1): 5 (1926)
Notes: Ligniella has been poorly studied. Nag Raj and DiCosmo (1981) re-described and illustrated Ligniella, and stated that L. atrata might be identical to Amphicytostroma tiliae (= Amphiporthe hranicensis). Index Fungorum (2019) listed Ligniella as a synonym of Discula (asexual morph of Apiognomonia). Comparative morphology study of Amphicytostroma, asexual morph of Apiognomonia and Ligniella has shown that Ligniella shares similar characters with Amphicytostroma and asexual morph of Apiognomonia in phialidic conidiogenous cells but differs in many ways in conidiomata and conidial structures. Ligniella has irregular, pulvinate, rugose, multilocular, conidiomata with a rather thick basal stroma, which differs from the subglobose, unilocular or multilocular, and convoluted in asexual morph of Apiognomonia, and multilocular but not convoluted in Amphicytostroma (Sutton 1980, Sogonov et al. 2007, this study). The conidia of Ligniella are cylindrical or bacilliform, and aseptate which resemble the cylindrical and aseptate conidia in Amphicytostroma, but differ from the broadly ellipsoid to oval or fusiform and 0–1-aseptate in asexual morph of Apiognomonia (Sogonov et al. 2007, this study). Maharachchikumbura et al. (2015) placed Ligniella in Sordariomycetes, genera incertae sedis. We accept Ligniella as a legitimate name and place it in Ascomycota, genera incertae sedis until molecular data is available.
Distribution: Russia.
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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