Disentangling the Trichoderma viridescens complex.
Trichoderma viridescens is recognised as a species complex. Multigene analyses based on the translation elongation factor 1-alpha encoding gene (tef1), a part of the rpb2 gene, encoding the second largest RNA polymerase subunit and the larger subunit of ATP citrate lyase (acl1) reveals 13 phylogenetic species with little or no phenotypic differentiation. This is the first use of acl1 in Trichoderma phylogenetics. The typification of T. viridescens s.str. is clarified and Hypocrea viridescens is replaced by the new name T. paraviridescens. Besides these two species, eleven are phylogenetically recognised and T. olivascens, T. viridarium, T. virilente, T. trixiae, T. viridialbum, T. appalachiense, T. neosinense, T. composticola, T. nothescens and T. sempervirentis are formally described and illustrated. Several species produce yellow diffusing pigment on cornmeal dextrose agar, particularly after storage at 15 °C, while T. olivascens is characterised by the formation of an olivaceous pigment. The results are compared with earlier publications on this group of species.
Department of Systematic and Evolutionary Botany, Faculty Centre of Biodiversity, University of Vienna, Rennweg 14, A-1030 Vienna, Austria;
W M
WM
Jaklitsch
321 Hedgehog Mt. Rd., Deering, NH 03244, USA.
G J
GJ
Samuels
United States Department of Agriculture, Agricultural Research Service, Systematic Mycology & Microbiology Laboratory, B-010a, 10300 Baltimore Ave, Beltsville, MD 21202, USA.
A
A
Ismaiel
Department of Systematic and Evolutionary Botany, Faculty Centre of Biodiversity, University of Vienna, Rennweg 14, A-1030 Vienna, Austria;
H
H
Voglmayr
Hypocrea; Hypocreaceae; acl1; phylogenetic analysis; rpb2; systematics; tef1