Russulasubgen.Cremeoochraceaesubgen. nov.: a very small and ancient lineage sharing withMultifurca(Russulaceae) an identical, largely circum-Pacific distribution pattern

Abstract

AbstractThe application of DNA data on a worldwide sampling has revolutionized the infrageneric classification of the highly diverse ectomycorrhizal genusRussula. Based on collections made in New Zealand, East Asia and North America, this study describes the new subgenusCremeoochraceae, the ninth subgenus inRussula. Even though BLASTn of the ITS sequences suggested affinities with species of subgeneraRussulaandHeterophyllidiae, the phylogenetic analysis based on a five-locus DNA dataset placed the target samples in an independent major clade that is systematically equivalent to subgenus. The new subgenus shares with subgen.Brevipedumsubsect.Pallidosporinaethe general field habit, the unequal lamellae and the relatively small spores with inamyloid suprahilar spot and similar spore ornamentation. It differs from the latter subsection principally in the poor contents of all types of cystidioid cells and the often areolate-scurfy pileus surface composed of slender, undulating hyphal terminations with frequent subcapitate apices. Biogeographically, subgen.Cremeoochraceaeshares withMultifurca, the sister genus ofLactarius, a circum-Pacific distribution pattern with the exception of South America. Both lineages lack representatives in Europe and Africa. The hypothesis proposing an African origin for the genus is considered unlikely.