Leptodermella
Leptodermella Höhn., Z. Gärungsphysiol. 5: 212 (1915)
Ascomycota, genera incertae sedis
Saprobic on dead stems of Matricaria suaveolens (Asteraceae). Sexual morph: undetermined. Asexual morph: Conidiomata pale orange, acervular, solitary, epidermal to subepidermal, immersed to erumpent, circular, unilocular, glabrous. Ostiole absent, dehiscence by irregular breakdown of upper host tissue. Conidiomatal wall composed of thin-walled, hyaline cells of textura angularis in the basal part. Conidiophores arising from the inner layer of the basal stroma, reduced to conidiogenous cells. Conidiogenous cells hyaline, holoblastic, cylindrical, determinate, smooth-walled. Conidia hyaline, ellipsoid to oval-ellipsoid, with rounded apex and truncate base, unicellular, thick- and smooth-walled, wall of two layers, the outer projecting as a basal frill, guttulate (Sutton 1980).
Type species: Leptodermella incarnata (Bres.) Höhn., Z. Gärungsphysiol. 5: 212 (1915)
Notes: Only Leptodermella incarnata is accepted in Leptodermella by Wijayawardene et al. (2017b). Leptodermella incarnata shares similar char Johnston et al. 2004 acters of conidia (hyaline, aseptate, ellipsoid to ovoid conidia with two layers wall) with asexual morph of Hercospora tiliae (Lamproconiacea, Diaporthales, Sordariomycetes) and Pezicula italica (Dermateaceae, Helotiales, Leotiomycetes). However, they can be distinguished by conidiomata, conidiophores and conidiogenous cells. The conidiophores of Hercospora tiliae and Pezicula italica are reduced to conidiogenous cells, whereas they are hyaline, septate, and branched at the base in H. tilia (Sutton 1980, Senanayake et al. 2018). Leptodermella incarnata has acervular conidiomata and holoblastic, cylindrical conidiogenous cells. Hercospora tiliae has pycnidial, ostiolate conidiomata with superficial cap of sterile tissues surrounding ostiole, and holoblastic, cylindrical conidiogenous cells. Pezicula italica has pycnidial conidiomata with a large ostiole, and enteroblastic, phialidic conidiogenous cells (Fig. 264). No sexual morph has been linked to Leptodermella and no molecular data is available. Fresh collections of Leptodermella incarnate are needed to place this genus in a natural classification.
Distribution: Latvia (Sutton 1980).
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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