Our specimens from New Zealand and the Czech Republic fit well the description and illustration of T. fibrosa from Hong Kong, China, provided by Hyde et al. (2000), except that the ascospores do not possess a fibrillar sheath. The occurrence on water-saturated decayed wood (ICMP 15147, collected as dried drift-wood on the shores of a river) is consistent with the ecology of other freshwater species classified in this genus. The material from the Czech Republic was collected in the glacial cirque in the Sumava Mts., a unique locality with specific microclimatic conditions. The ascomata in our collections were larger than ascomata in the type collection (135–255 μm diam fide Hyde et al. 2000). The material collected in New Zealand was isolated in axenic culture, but only sterile dematiaceous mycelium was produced. Considering that cryptic speciation appears to be common in this lineage, the morphological differences in the ascospore wall, ecological differences, and the absence of molecular data from collections originating from the area of original description of T. fibrosa, the present collections are tentatively identified as this species, pending further investigations of accessions from the area of its description.