Eriosporella
Eriosporella Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 125(1-2): 109 (1916).
Index Fungorum number: IF 8206; Facesoffungi number: FoF 08264, 2 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic or pathogenic on leaves. Sexual morph: see Nag Raj (1993). Asexual morph: Conidiomata developing intraepidermally, flat or lens-shaped, rupturing the upper layers of the multilayered epidermis, remnants of which wear away over the old fruit bodies, resulting in completely open, disciform, whitish acervuli. Basal stroma 2–5 cells thick and composed of isodiametric, thin-walled, hyaline cells, 3–6 µm in diam., near the edges of the conidiomata slightly larger and up to 12 µm in diam. remaining attached to the epidermal remnants. Conidiophores rising from the basal tissue, hyaline, short cylindrical or elongated, occasionally sympodially branched but sometimes much reduced so that the conidiogenous cells develop directly from the basal tissue. Conidiogenous cells subglobose, short-conical or cylindrical, phialidic with a minute thickening inside the apical pore. Conidia tetraradiate, composed of a main axis which is cylindrical, truncate at the base with a small marginal cellular appendage, 0–1-septate, hyaline, bearing apically 3 diverging, rather slender and flexuous hyaline arms, 3–4(–5)-septate, tapering to the tips (adapted from Li et al. 2020).
Type species: Eriosporella calami (Niessl) Höhn.
Notes: Eriosporella was redescribed by Sutton (1980) from an additional part of the type collection and he reported the conidiogenous process as phialidic. Nag Raj and DiCosmo (1981) observed the appendage but described the conidiogenous process as annelidic with up to three annellations. Van der Aa and van Oorschot (1985) re-observed the type specimen and confirmed the conidiogenous cells as phialidic. Eriosporella differs from similar genera such as Tridentaria, Tricornispora, Fumagopsis and Kazulia in having unique melanconiaceous means of growth, shorter appendages and long and slender branches on the conidia. Li et al. (2020) provided an updated description for Eriosporella but could not confirm whether the conidiogenesis process is phialidic or annellidic. The phylogenetic analyses of combined LSU and SSU rDNA sequence data of Dai et al. (2014) showed E. bambusicola to belong to Capnodiales where it clustered with Pseudoramichloridium. The relationship of Eriosporella with other genera are uncertain and is placed in Capnodiales incertae sedis. More species with sequence data are needed to clarify the familial placement of this genus. Molecular markers available for Eriosporella are LSU, SSU and ITS.
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