Hypocreales » Stachybotryaceae » Koorchaloma

Koorchaloma bambusae

Koorchaloma bambusae Nag Raj, Mycotaxon 19: 175 (1984) 

Saprobic on dead leaves and culms of Bambusa sp. (Poaceae). Sexual morph: undetermined. Asexual morph: Conidiomata up to 150 μm long and up to 100 μm wide, off-white when moist, dirty yellow to brownish yellow when dry, stromatic, shallow-cupulate, amphigenous when foliicolous, solitary to gregarious and often confluent, superficial, appearing as pulvinate, gelatinous, flat crusts, rounded to oval in outline, occasionally elongate, setose. Conidiomatal wall composed of two types: a) basal wall of textura angularis with thick-walled, dark brown cells; b) reduced excipulum 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 65–180 μm long, 3–13 μm wide, dark brown, becoming progressively paler towards the apex, cylindrical, slightly inflated at base and apex, straight or variously curved, up to 3-septate, unbranched, thick-walled, interspersed through the basal stroma. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 8–14 × 2.5–5 µm ( = 10 × 3 μm), hyaline, cylindrical to ampulliform or lageniform, with minute periclinal thickenings, discrete, smooth-walled. Conidia 10–16 × 4–6 µm ( = 13 × 5 µm, n = 150), mostly hyaline, fusiform, with an apiculate apex and a narrow truncate base, aseptate, thick- and smooth-walled, guttulate, bearing flared apical and basal mucoid appendages.

 

Material examined: Jamaica, Maggotty, on dead leaves and culms of Bambusa sp. (Poaceae), 30 May 1978, T.R. Nag Raj (DAOM 187208, holotype); Thailand, Chiang Rai, on dead leaves of bamboo, 19 April 2014, Sun-Jun Zu, WJL0037 (MFLU 19-2899), (KUN, HKAS 93583).

 

Notes: The new collection (MFLU 19-2899/WJL037) from Thailand is similar to the type of Koorchaloma bambusae in having yellow to brownish yellow, shallow-cupulate, setose conidiomata with a basal stroma composing cells of textura angularis to textura intricta, phialidic, cylindrical to ampulliform conidiogenous cells and fusiform conidia bearing mucoid appendages. The new collection shares similar conidial dimensions to the conidia of the holotype of K. bambusae (wjl037: 10–16 × 4–6 µm ( = 14 × 5 µm, DAOM 187208: 11–14 × 4–5.5 µm ( = 12 × 5 µm). According to morphology, habit and host, our collection is identified as a new record of K. bambusae from Thailand.

 

 

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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