Koorchaloma jamaicensis
Koorchaloma jamaicensis Nag Raj, Mycotaxon 19: 179 (1984)
Saprobic on blades of grass. Sexual morph: see Nag Raj (1984). Asexual morph: Conidiomata 100–300 µm diam., 30–50 µm deep (conidiomatal dimension from Nag Raj 1993, excluding the conidial mass), dark brown to black, stromatic, shallow-cupulate, amphigenous, solitary to gregarious and occasionally confluent, superficial, appearing as pulvinate, gelatinous, flat crusts, rounded to cylindrical or irregular in outline, setose. Conidiomatal wall composed of two types: a) basal wall of textura angularis with thick-walled, dark brown cells; b) excipulum reduced, of textura oblita with pale brown cells in the outer layers gradually merging with a loose textura intricata with hyaline cells in the inner layers. Conidiomatal setae 100–200 μm long, 3–12 μm wide, marginal and irregularly interspersed, dark brown to black in the basal part, becoming paler above, with a somewhat bulbous, almost colourless, thin-walled, occasionally percurrent growth of terminal cell, subulate to subcylindrical, straight or variously curved, unbranched, septate. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 8–12 × 2–3 μm, hyaline, ampulliform to lageniform, with minute periclinal thickenings in the collarette zone, discrete, smooth-walled. Conidia 15–20 × 3–4 (
= 17 × 3.4) μm, hyaline, naviculate, occasionally fusiform, with an obtuse apex and a narrow truncate base, aseptate, thick- and smooth-walled, guttulate, bearing initially funnel-shaped appendages, then splitting into several radiating strands at each end.
Material examined: Jamaica, Montego Bay, Seawind Beach Resort area, on blades of undetermined grass, 27 May 1978, T.R. Nag Raj (DAOM 187210, type).
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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