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Hypocrea atroviridis sp. nov., the teleomorph of Trichoderma atroviride

     The Pennsylvania State University, Department of Plant Pathology, 301 Buckhout Lab., University Park, Pennsylvania 16802

Elke Lieckfeldt ²

     Humboldt-Universität zu Berlin, Institut für Biologie (Genetik), Chausseestr. 117, D-10115 Berlin, Germany

Gary J. Samuels ³

     United States Department of Agriculture, Agricultural Research Service, Systematic Botany and Mycology Lab., Rm. 304, B-011A, BARC-W, Beltsville, Maryland, USA 20705

A new species, Hypocrea atroviridis, is described for the teleomorph of Trichoderma atroviride. Based on sequences of ITS-1, 5.8S, and ITS-2 regions of the rDNA complex and translation-elongation factor (EF-1), T. atroviride and H. atroviridis form a well-supported clade within Trichoderma sect. Trichoderma. The conserved anamorphic phenotype of T. atroviride, observed for both conidial and ascospore derived cultures, was only found within that clade. In contrast, the teleomorph phenotype of H. atroviridis was morphologically indistinguishable from H. rufa, the teleomorph of T. viride. This Hypocrea phenotype may, therefore, be considered to be plesiomorphic within Trichoderma sect. Trichoderma, suggesting that genes controlling the expression of the teleomorph and anamorph evolve at different rates and that the genes controlling expression of the teleomorph are more conserved than are those controlling the expression of the anamorph.

Key words: biological control, Hypocreales, ITS rDNA, systematics, translation-elongation factor EF-1

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