Boletus bangladeshensis : Unearthing a New Porcini Mushroom From Tropical Bangladesh

Boletus bangladeshensis , a new species of porcini from Bangladesh, a tropical region of South Asia, is described and illustrated. This species is characterized by its medium‐sized dark reddish brown to reddish brown basidiomata, unchanging context, stuffed pores becoming yellow with age, partially reticulated stipe, fusoid smooth basidiospores, narrowly fusoid cheilo‐ and pleurocystidia, a trichoderm pileipellis whose terminal elements are composed of inflated cells, and putatively ectomycorrhizal association with Shorea robusta , a tree of the plant family Dipterocarpaceae. A molecular phylogenetic analysis based on three genes (nrLSU, TEF1‐α , and RPB1 ) indicates that B . bangladeshensis forms a well‐supported, independent lineage distinct from known porcini species. The new species forms a clade with B . sub violaceofuscus , B. semigastroideus , B. violaceofuscus , B . separans , B. tylopilopsis , B. nobilis , and B. orientialbus . Phylogenetic placement of the new taxon, together with morphological comparisons with closely related taxa, is provided.