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A new species of Hyphodermella (Basidiomycetes, Aphyllophorales) from Portugal

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A new species, Hyphodermella densa Melo & Hjortstam is described from a specimen collected in Portugal.
... The three others species are: H. maunakeaensis Gilbertson & Hemmes, described from Hawaii (Gilbertson et al. 2001), H. rosae (Bres.) Nakasone from Italy (Nakasone 2008), and H. densa Melo & Hjortstam described from Portugal (Melo and Hjortstam 2003) and, so far, only known from two localities in this country. ...
... According to the descriptions of H. corrugata (Bourdot and Galzin 1927;Nakasone 2008) based on specimens of the Mediterranean area, this taxon shows some morphological variability, and it has been suspected that it could represent a species complex rather than a single species. On the other hand, the descriptions of H. densa and H. rosae (Melo and Hjortstam 2003;Nakasone 2008) show similar and overlapping characters. Therefore, a critical study is required. ...
... Notes. According to Melo and Hjortstam (2003) H. densa shares several characters with H. corrugata: the projecting hyphal elements glued into crystalline pillars, the simple septate hyphae, and the ellipsoid spores. They differ by the densely interwoven subicular hyphae, and shorter spores in H. densa. ...
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The genus Hyphodermella was studied based on material from the western Mediterranean area (France, Italy, Spain, Portugal and Morocco) where the following three species have been recognized: H. corrugata (Fr.) J. Erikss. & Ryvarden, widely distributed, H. densa Melo & Hjortstam, only known from Portugal, and H. rosae (Bres.) Nakasone described from Italy. Twenty-one new ITS nrDNA sequences from these species, including the holotype collection of H. rosae and the paratype of H. densa, were aligned with one obtained from GenBank. The molecular results show that these collections are distributed in two highly supported monophyletic clades: one corresponds to H. corrugata, and the other one with H. densa and H. rosae collections. Morphological studies, including the type collections of the three taxa, show significant differences between the clades if we take into account the size of basidia and spores. The present study confirms H. corrugata as an independent species of H. rosae and H. densa, and that H. densa and H. rosae are conspecific; consequently, H. densa is a synonym of H. rosae. This last species is widely distributed in the Mediterranean area (France, Italy, Spain and Portugal) and as frequent as H. corrugata. Comments are offered on sequencing the barcode from types and well-annotated specimens. Keywords Hyphodermella corrugata - H. rosae - H. densa -Corticioid fungi-Taxonomy-Barcoding-ITS
... J. Eriksson & Ryvarden and was classified in the family Phanerochaetaceae (Larsson 2007). Based on morphological characters Hyphodermella comprises six species: H. corrugata (Eriksson & Ryvarden 1976), H. maunakeaensis (Gilbertson et al. 2001), H. densa (Melo & Hjortstam 2003), H. rosae (Nakasone 2008), H. ochracea (Duhem 2010) and H. brunneocontexta (Duhem & Buyck 2011). Telleria et al. (2010) while studying the morphology of three Hyphodermella species concluded that the morphological differences between H. rosae and H. densa are insignificant, which was also supported by molecular data. ...
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Hyphodermella densa (6419 I. Melo, LISU): a) section through the basidiome, b) hymenium and subhymenium, c) subicular hyphae, d-e) spores. Hyphodermella corrugata (3385 I. Melo, LISU): f-g) spores
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Fig. 1. Hyphodermella densa (6419 I. Melo, LISU): a) section through the basidiome, b) hymenium and subhymenium, c) subicular hyphae, d-e) spores. Hyphodermella corrugata (3385 I. Melo, LISU): f-g) spores. References ERIKSSON, J. & L. RYVARDEN (1976): The Corticiaceae of North Europe.