Abstract: Trichoderma brevicompactum, a new species,
was isolated from soil or tree bark in North, Central
and South America, including the Caribbean Islands,
and southwestern and southeastern Asia. Morphological
and physiological characters, the internal
transcribed spacer regions of the rDNA cluster (ITS1-
5.8SrDNA-ITS2) and partial sequences of translation
elongation factor 1-alpha (tef1) are described. Trichoderma
brevicompactum is characterized by a pachybasium-type
morphology, morphologically resembling
other small-spored species referable to Trichoderma
section Pachybasium but with essentially subglobose
conidia. It is most closely related phylogenetically to
Hypocrea lutea, from which it differs in morphological
and physiological characters