Systematic revision of the Tubifera casparyi–T . dictyoderma complex: Resurrection of the genus Siphoptychium and introduction of the new genus Thecotubifera

• Main Authors: Leontyev, Dmitry V., Schnittler, Martin, Stephenson, Steven L., Novozhilov, Yuri K.
• Format: Dataset
• Language: unknown
• Published: Taylor & Francis 2019
• Subjects: Genetics; FOS Biological sciences; Molecular Biology; Evolutionary Biology; 59999 Environmental Sciences not elsewhere classified; FOS Earth and related environmental sciences; 69999 Biological Sciences not elsewhere classified; Developmental Biology; Plant Biology; Subarctic
• Online Access: https://dx.doi.org/10.6084/m9.figshare.9985085; https://tandf.figshare.com/articles/Systematic_revision_of_the_i_Tubifera_casparyi_T_i_i_dictyoderma_i_complex_Resurrection_of_the_genus_i_Siphoptychium_i_and_introduction_of_the_new_genus_i_Thecotubifera_i_/9985085

The genus Siphoptychium is resurrected on the basis of comparative morphology and phylogeny of partial nuc 18S rDNA (18S) and translation elongation factor 1-alpha ( EF1A ) nucleotide sequences. The genus is characterized by the firm upper surface of the pseudoaethalium, accreted but easily separable sporothecae, a tubular or fibrous columella, and spores with a reticulate ornamentation consisting of 7–9 meshes across the diameter. In addition to the currently known single species S. casparyi (= Tubifera casparyi ), two new members of Siphoptychium are described: S. violaceum from coniferous forests of Europe, east Asia, and southeast Asia, and S. reticulatum from temperate and subarctic regions of North America and alpine regions of Europe. A second genus, Thecotubifera , is described to accommodate Tubifera dictyoderma . The fruiting body of this species is transitional between a pseudoaethalium and a true aethalium. It is covered by a contiguous membranous cortex formed by the fused tips of the sporothecae, a feature typical for aethalia. However, the inner portions of sporothecae remain discernible, a feature more typical for pseudoaethalia. Columellae of Th. dictyoderma are formed by perforated plates, and the spores have a reticulate ornamentation consisting of 2–5 meshes across the diameter. For Th. dictyoderma , we could confirm records only for tropical regions and Japan, whereas all studied European specimens, including those mentioned in current monographs, represent species of Siphoptychium .