Many discussions about taxonomic significance of dolipore/parenthe-some ultrastructure have been published, during the last few years. However, the problem is difficult because, in the majority of Basidiomycetes, the real function of the pore cap is undecided. Our research shows that the dolipore/parenthesome ultrastructure ofTremella mesentericaFries, varies according to its location, either in the secondary micelium hyphae, or at the basidum base, or in the conidiophore hyphae. In addition, the conidiophore hyphae extremities, when dividing to form conidia, form a passage that is always without a parenthesome. This variability suggests that dolipore-/parenthesome morphology is connected with different functions, according to its location.