Vestigium
Vestigium Piroz. & Shoemaker, Can. J. Bot. 50(6): 1163 (1972)
Leotiomycetes, Leotiomycetidae, Helotiales, genera incertae sedis
Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata dark amber, acervular, solitary, semi-immersed to erumpent or superficial, circular or elliptical in outline, blister-like, subglobose in section view, unilocular, glabrous. Ostiole absent, dehiscence by irregular splits of the overlapping host tissue. Conidiomatal wall composed of thin-walled, pale brown cells of textura angularis in the basal stroma. Conidiophores arising from the upper cells of the basal stroma, hyaline, pallisade-like, fasciculate, branched above, septate, with acropleurogenous conidia. Conidiogenous cells hyaline, holoblastic, sympodial, cylindrical, integrated, indeterminate, smooth-walled, with 1–2 sympodial proliferations at the apex. Conidia hyaline, paw-like, applanate, with a central angular cell and 3–6 ovoid, often curved, peripheral cells, smooth-walled or verrucose, guttulate (Pirozynski and Shoemaker 1972, Morgan-Jones et al. 1972d, Sutton 1980).
Type species: Vestigium felicis Piroz. & Shoemaker, Can. J. Bot. 50(6): 1163 (1972)
Notes: Pirozynski and Shoemaker (1972) proposed a new genus for a single species V. felicis collected on young twigs of Thuja plicata (Cupressaceae). This genus is characterized by acervular conidiomata, pallisade-like, filiform conidiophores, holoblastic, sympodial conidiogenous cells and toe-like, applanate conidia (Pirozynski and Shoemaker 1972, Morgan-Jones et al. 1972d, Sutton 1980). Shoemaker et al. (2013) included the second species V. trifidum Shoemaker & Malloch on Abies balsamea (Pinaceae), which was separated from the type by its superficial pycnothyrium and 3-toed conidia with verrucose wall. Molecular data of Vestigium trifidum placed it in Helotiales, genera incertae sedis (Leotiomycetes) (Shoemaker et al. 2013, Crous et al. 2014d). However, sequence data is not available for the type species. Therefore, fresh collections of type are needed to confirm its placement.
Distribution: Canada, USA (Pirozynski and Shoemaker 1972, Shoemaker et al. 2013).
Reference:
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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