Anatomical and ITS rDNA-based phylogenetic identification of two new West African resupinate thelephoroid species

作者：Yorou Nourou Soulemane^*; Guelly Atsu Kudzo; Agerer Reinhard

来源：Mycoscience, 2011, 52(6): 363-375.

DOI：10.1007/s10267-011-0117-4

• Anatomy
• Genetic distance
• Phylogenetic position
• Taxonomy
• Tropical Africa

An anatomical approach coupled with molecular phylogeny of 84 sequences of thelephoroid taxa have been used to describe two new West African resupinate Thelephorales, namely, Tomentella agereri and Tomentella maroana. T. agereri presents a maximal sequence similarity of 94% with its genetically closest species, Tomentalla pilosa, according to a Blastn search in public GenBanks. By molecular phylogenetics, it is nested within the T. pilosa complex, a well-supported (bootstrap support of 100%) monophyletic clade composed of cystidiate and differentiated rhizomorphic species, although it presents contrasting anatomical features including the lack of cystidia, the presence of undifferentiated rhizomorphs, and basidiospores with very short aculei, up to 0.5 mu m. Tomentalla maroana is close, by molecular phylogenetic study, to T. ellisii, T. pisoniae, and T. hjortstamiana. The phylogenetic proximity between T. maroana and T. ellisii is supported by morphological characters between the two species, namely, a crustose adherent basidiocarp, a differentiated sterile margin, and a granular hymenium. The two species deviate from each other by 11.38-12.37% with regard to the ITS rDNA sequences, whereas the intraspecific genetic distances vary from 1.68% to 2.9% among the three specimens assigned to T. maroana. Discriminating characters as well as genetic distance between the new species and the closely related species are discussed in detail.

• 出版日期2011-11