Tiarosporella graminis
Tiarosporella graminis (Piroz. & Shoemaker) Nag Raj, Can. J. Bot. 51(12): 2469 (1974) [1973]
Facesoffungi number: FoF 07718
Follicolous, occurring on leaves of Calamovilfa longifolia (Poaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 140–200 µm diam., 150–160 µm high, brown to dark brown, pycnidial, solitary to gregarious, subepidermal, deeply immersed, globose to subglobose, unilocular, glabrous, thick-walled, ostiolate. Ostiole single, circular, centrally located. Conidiomatal wall 20–40 µm wide, composed of thick-walled, brown cells of textura globosa in the lower layers at the outer part, gradually merging with pale brown to hyaline cells of textura prismatica near conidial hymenium, becoming relatively thick-walled, brown to pale brown cells of textura angularis in the lateral and ostiolar region. Conidiophores arising from the innermost layers of conidiomata, hyaline, short-cylindrical or dolliform, or irregular, branched, swollen at base, septate, often constricted at septa, thick- and smooth-walled. Macroconidiogenous cells 7–20 × 3–5 µm, hyaline, holoblastic, cylindrical to ampuliform, integrated, indeterminate, smooth-walled, without proliferations. Macroconidia 20–30 × 5–11.5 µm (
= 25.5 × 8.6 µm; n = 50), hyaline, ellipsoidal, rounded at both ends, or sometimes narrowed and truncate at base, bulging in the middle part, unicellular, smooth-walled, bearing 2 undulate, or 1 flame-shape or irregular, mucoid, apical appendages which arise as segments of a partial mucoid sheath initially enclosing the upper part of the developing conidium, eventually flared. Microconidiogenous cells hyaline, holoblastic, ampuliform, integrated, smooth-walled. Microconidia not observed.
Material examined: USA, Wisconsin, Madison Dane County, on leaves of Calamovilfa longifolia (Poaceae), 14 November 1962, H.C. Greene (DAOM 90210, holotype).
Notes: Tiarosporella graminis was originally regarded as a variety of T. palusoda, and later was raised to species rank by Nag Raj (1973). This species is similar to T. palusoda in form of conidiomata, conidiogenous cells and conidia, but it is distinct in conidial shape. In Tiarosporella graminis, conidia are usually fusiform, tapered to obtuse at apex and slightly truncate at base, and widest in the middle, whereas, in T. palusoda conidia are consistently long clavate.
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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