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''Suillus sibiricus'' is a fungus of the genus ''Suillus'' in the Suillaceae family. It is found in mountains of Europe, North America and Siberia, strictly associated with several species of pine tree. Due to its specific habitat and rarity in Europe, it has been selected for inclusion in several regional Red Lists. Its fruit bodies are characterised by having slimy caps in wet weather, which can reach diameters of up to . On the underside of the cap are yellow angular pores that bruise a pinkish to cinnamon colour. The stem is up to tall and wide and typically has a ring, a remnant of the partial veil that covers the fruit body in its early development. In North America, it is commonly called the Siberian slippery jack. Phylogenetic analysis has shown that ''S. sibiricus'' is closely related to ''S. umbonatus'' and ''S. americanus'', and may in fact be conspecific with the latter species. ==Taxonomy, naming, and phylogeny== }} }} |caption=Possible phylogenetic relationships of ''S. sibiricus'' and related species with an eastern Asian/eastern North American disjunct distribution.〔 }} The species was first described scientifically under the name ''Ixocomus sibiricus'' by American mycologist Rolf Singer in 1938, based on material that was collected under ''Pinus cembra'' var. ''sibirica'' in the Altai Mountains of central Asia.〔 In 1945, he transferred it to ''Suillus''.〔 Alexander H. Smith called the species ''Boletus sibiricus'' in 1949,〔 but this is today considered a synonym.〔 Singer named the subspecies ''S. sibiricus'' subsp. ''helveticus'' in 1951,〔 based on material collected by Jules Favre from Switzerland in 1945. Roy Watling later considered this a ''nomen nudum''—not published with an adequate description, and therefore failing to qualify as a formal scientific name.〔 According to Singer's 1986 arrangement, ''S. sibiricus'' is classified in the subsection ''Latiporini'' of section ''Suillus'' in the genus ''Suillus''. Section ''Suillus'' includes species with glandular dots on the stem, and a partial veil which becomes appendiculate on the cap edge. Characteristics of species in subsection ''Latiporini'' include cinnamon-coloured spore prints without an olive tinge, and wide pores on the underside of the cap (wider than 1 mm when mature). Other species in the subsection include ''S. flavidus'', ''S. umbonatus'', ''S. punctatipes'', and ''S. americanus''.〔 A phylogenetic analysis of various eastern Asian and eastern North American disjunct ''Suillus'' species revealed that ''S. sibiricus'' forms a well-supported clade with ''S. americanus'' and ''S. umbonatus'';〔 these relationships are corroborated by a previous analysis (1996), which used a larger sampling of ''Suillus'' species to determine taxonomic relationships in the genus.〔 Within this clade, ''S. umbonatus'' and U.S. ''S. sibiricus'' can be separated from the rest of the group. However, the phylogenetic relationships among the tested isolates determined from different methods of analysis are not always consistent and could not be established with confidence. In general, there is little phylogenetic divergence detected in this clade.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Suillus sibiricus」の詳細全文を読む スポンサード リンク
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