Trichoderma virens (Miller, Giddens & Foster) Arx

Thokala, Prameeladevi, Narayanasamy, Prabhakaran, Kamil, Deeba & Choudhary, Shiv Pratap, 2021, Polyphasic taxonomy of Indian Trichoderma species, Phytotaxa 502 (1), pp. 1-27 : 23

0. Trichoderma virens (Miller, Giddens & Foster) Arx , Nova Hedwigia Beih. 87: 88, 987. Figure

Section— Pachybasium

Description:

Colony: 6.0–7.0 cm growth was observed in 4 days on PDA medium. Conidiation effuse covering the entire surface of the plate, or forming spreading, light yellowish green flat pustules concentrated near the margin, later turning dark green. Reverse colourless and sometimes drab coloured.

Conidiophores: Conidiophores arising in clusters in lateral branches from undifferentiated aerial mycelium, at the base sterile and un-branched, but the upper part fertile toward the apex,each branch terminating in a penicillus of (2–)3–6 closely appressed phialides. The entire branching system irregular and uncrowded.

Phialides: Phialides mainly arising in closely appressed whorls of 2–5 on terminal branches, less frequently in pairs or singly, straight, lageniform to ampulliform and sometimes laginiform to subulate, base constricted, swollen in the middle, attenuate at the tip.

Conidia: Broadly ellipsoidal to obvoidal and minutely warted at high magnifications (SEM), 3.5–8.0 × 3.0–5.0 µm, dark green. Conidia from adjacent phialides often coalescing into large gloeoid masses.

Chlamydospores: Chlamydospores abundant, terminal and intercalary, globose to sub-globose, 6.0–12 µm.

Cultures examined: ITCC6461 (Soil, New Delhi); ITCC 6470 (Soil, New Delhi).

Diagnostic features: In the plate light yellowish green flat pustules concentrated near the margin turning to dark green.Conidiophore branching terminating in a penicillus of (2–)3–6 closely appressed phialideswhich are straight, lageniform to ampulliform, sometimes subulate, base constricted, swollen in the middle, attenuate at the tip. Conidia obvoidal and minutely warted. Conidia from adjacent phialides often coalescing into large gloeoid masses.

Ecology and habitats: Wood, soil, other fungi.