title: Trichoderma evansii and T. lieckfeldtiae: two new T. hamatum-like species.
abstract: The new species, Trichoderma evansii and T. lieckfeldtiae, resemble the closely related T. hamatum and T. pubescens in forming discrete, setose conidial pustules within which arise smooth, green conidia from pachybasium-like conidiophores. The phylogenetic position of these species was determined with combined partial sequences of ITS, translationelongation factor 1-alpha, RNA polymerase II subunit and actin genes. All are members of the Viride clade. Trichoderma evansii forms a sister group relationship with a clade that includes T. hamatum and T. pubescens. It differs from the latter two species in having subglobose conidia; it was isolated as an endophyte from sapwood of Lophira alata (Ochnaceae) and Cola verticillata (Malvaceae) in Cameroon and Theobroma gileri (Malvaceae) in Peru. Trichoderma lieckfeldtiae occupies an unresolved position in the Viride clade despite being virtually morphologically indistinguishable from T. hamatum; it was isolated from fruit of cacao infected with Moniliophthora roreri in Colombia, pseudostroma of Moniliophthora roreri on pods of Theobroma cacao in Peru and from soil in a cacao farm in Cameroon (central Africa).
authors.affiliation: United States Department of Agriculture, Agriculture Research Service, Systematic Mycology & Microbiology Lab, Room 304, B-01A, 10300 Baltimore Avenue, Beltsville, Maryland 20705, USA. gary.samuels@ars.usda.gov
authors.forename: Gary J
authors.initials: GJ
authors.lastname: Samuels
authors.forename: Adnan
authors.initials: A
authors.lastname: Ismaiel
mesh_terms: D017753:Ecosystem; D005800:Genes, Fungal / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D013045:Species Specificity; D014242:Trichoderma / Q000145:classification* / Q000166:cytology / Q000302:isolation & purification