Trichoderma tomentosum Bissett, Can. J. Bot.

Thokala, Prameeladevi, Narayanasamy, Prabhakaran, Kamil, Deeba & Choudhary, Shiv Pratap, 2021, Polyphasic taxonomy of Indian Trichoderma species, Phytotaxa 502 (1), pp. 1-27 : 21-23

9. Trichoderma tomentosum Bissett, Can. J. Bot. 69:, 99. Figure

Section— Trichoderma

Description:

Colony: 7–7.5 cm growth was observed in four days. White mycelium growing mostly at the edge of the petriplate with white small pustules. Reverse of the plate was colourless. Pustules scattered around the periphery of the Petri dish, yellow-green or gray-green, uniformly cottony.pustules pulvinate and conspicuously hairy, very dense. Fertile extensions of conidiophores not formed. Sterile hairs spiraled, branched, thin-walled, septate, and acute at the tip.

Conidiophores: Conidiophores comprising an branched and unbranched sterile hair from the base of which arise at right angles short, broad lateral branches, each comprising a 3–4 cells, rebranching at right angles to produce secondary fertile branches of 1–2 cells with phialides arising from the primary and secondary branches in clusters.

Phialides: Phialides are ampulliform, short and broad, almost ovoidal with a distinct neck, forming in dense, grape-like clusters at the tips of fertile branches.

Figure. Trichoderma tomentosum (A) Growth on PDA, (B) Pustules, (C) Reverse of the plate, (D,E) Sterile hairs extending beyond pustules, (F,G,H) Conidiophores consisting of a sterile elongation with phialides clustered at the base, (I) Spores.

FIGURE. Trichoderma virens (A,B) Growth on PDA, (C) Pustules, (D) Reverse of the plate, (E,F) Conidiophore branching, (G,H, I,J) Phialide disposition, (K) Spores, (L) Spores under SEM, (M) Chlamydospores.

Conidia: Conidia green, broadly ellipsoidal, 3.0–5.0× 2.0–3.5 µm, smooth.

Culture Examined: ITCC 7269 ( Soil , Kochi, Kerala) .

Diagnostic features: Trichoderma tomentosum can be distinguished by the small conidia, short phialides and conidiophores apical elongations that are sterile, long and flexuous.

Ecology and habitats: Soil.