Clonostachys byssicola
Clonostachys byssicola Schroers, Stud. Mycol. 46: 80 (2001)
Index Fungorum number: IF485119
Saprobic on a dead stem of Chromolaena odorata. Asexual morph: Sporodochia pale yellow, or pale orange, appearing as dome-shaped masses on the host. Subhymenium arranged in a textura porrecta. Conidiophores dimorphic. Primary conidiophores 3–5.2 μm wide at base, verticillium-like, rare, forming towards the margin, main stipe short, hyaline, smooth-walled. Phialides 15.3–38 (x̅ = 28.2, n = 6) μm long, 1.8–3.3 (x̅ = 2.2, n = 8) μm wide at base, in whorls of 2–4, straight, cylindrical, slightly tapering towards the tip, with periclinal thickening at their apex, collarette lacking or minute. Secondary conidiophores bi- to quinquiesverticillate, densely aggregated, formed in sporodochia on the host surface, stipes short. Phialides in loose whorls of 3–5, straight to slightly curved, narrowly flask-shaped or almost cylindrical, tapering in the upper part, with periclinal thickening at their apex, without a visible collarette, 8–15.6 (x̅ = 14.1, n = 15) μm long, 1.5–3.1 (x̅ = 2.2, n = 15) μm wide at base, intercalary phialides absent. Conidia 3.2–6.0 × 2–3.7 (x̅ = 4.9 – 3, n = 35) μm, ovoidal to subglobose, conidia from primary conidiophores slightly curved to almost ellipsoidal, hilum laterally displaced, hyaline, minutely curved, broadly rounded distally, with a laterally displaced hilum, hyaline, smooth-walled. Sexual morph: Bionectria byssicola (Schroers 2001).
Clonostachys byssicola (Material examined – THAILAND, Chiang Mai Province, on a dead stem of Chromolaena odorata, 2 February 2017, R.H. Perera BN4, MFLU 18-2729, living culture MFLUCC 17-2033). a Herbarium material. b Sporodochia on the host. c Secondary conidiophores, penicillate. d Secondary conidiophores and verticillium-like primary conidiophores. e Phialides with conidia. f Conidia. g Germinating conidium. h, i Colony on PDA. Scale bars: c, d = 50 μm, e = 20 μm, f, g = 10 μm.
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