Trichoderma hamatum (Bon.) Bain., Bull. Soc. Mycol.

Thokala, Prameeladevi, Narayanasamy, Prabhakaran, Kamil, Deeba & Choudhary, Shiv Pratap, 2021, Polyphasic taxonomy of Indian Trichoderma species, Phytotaxa 502 (1), pp. 1-27 : 14

9. Trichoderma hamatum (Bon.) Bain., Bull. Soc. Mycol. France:, 906. Figure

Section— Pachybasium

Description:

Colony:7.0– 8.5 cm growth was observed in 4 days on PDA medium. Mycelium is mostly submerged, less aerial mycelium which is floccose and white. Compact cushioned pustules looking velvety due to the presence of numerous, flexuous sterile conidiophore apices. These pustules are white at first, becoming yellow, then pea-green followed by olive green. Colorless at the reverse of the Petri plate.

Conidiophores: Conidiophores in pustules are broad, comprising a regular, undulate and humate sterile elongation with the phialides arising near the base. The lateral branches typically comprise one or a few, broad cells with phialides arising at the tip and along the length. The internodes between branches are short and the phialides densely clustered. Phialides: Phialides are short, broadly ellipsoidal to ovoidal, pyriform and ampulliform, formed on small branches, smooth - walled, hyaline or pale green color.

Conidia: Oblong to ellipsoidal and smooth, 5.0–6.0 × 3.0–4.0 µm, green.

Chlamydospores: Chlamydospores terminal and intercalary, globose, 4.0–8.0 µm diam.

Cultures examined: ITCC 7271 (Rice soil, Cuttack , Odisha) ; ITCC 7272 ( Soil , Kochi, Kerala) ; ITCC 7270 (Soil, Dehradun , Uttarakhand) .

Diagnostic features: Compact cushioned pustules white at first, becoming yellow, then green in colour. Conidiophores with non-fertile, stout, hamate and undulate elongations, with the short, ovoidal or pyriform densely clustered phialides near the base.

Ecology and habitats: Soil.