Two new resupinate Thelephorales (Basidiomycota, Agaricomycetes) from Guinea (West Africa)
Yorou, Nourou Soulemane; Diabaté, Moussa; Agerer, Reinhard
Tomentella minispora and T. baroensis are described as new species from West Africa based on anatomical evidence, ITS rDNA sequence analyses and molecular-phylogenetic inference. T. minispora is characterized by subglobose to globose small basidiospores with size ranging from 5.5 μm to 7.5 μm, short aculei of up to 0.8 μm and strongly inflated subhymenial hyphae (up to 23 μm). Both, sequence analyses and molecular-phylogenetic inference indicate the proximity of T. minispora to the clampless species T. amyloapiculata and T. fuscocinerea. Tomentella baroensis is characterized by the presence of extremely large young basidia (up to 20 μm wide), ellipsoid to lobed basidiospores of 8-13 μm and short aculei not exceeding 1 μm long. So far such large young basidia are known only from T. terrestris. However, ITS rDNA sequence analyses revealed that T. baroensis deviates from T. terrestris by at least 17 to 18%. Sequence analyses suggest T. ellisii as the most similar species to T. baroensis, whilst molecular-phylogenetic inference places it close to T. pisoniae and T. hjortstamiana, together with T. ellisii originating from deeper branch of the clade. Detailed anatomy and original iconographs are provided for both new species. Anatomical comparisons are made between the newly described species with their anatomically and molecular-phylogenetically close ones.