Collybiopsis pakistanica (Omphalotaceae, Agaricales, Basidiomycota), a new mushroom species from Margalla Hills, Pakistan, and two new combinations

A new species, Collybiopsis pakistanica, from Margalla Hills National
Park, Pakistan, is described based on micro-morphological and molecular
phylogenetic analyses. This species is characterized by its milky white
pileus, yellowish orange or light yellow to orange at central disc and
margins, lacrymoid basidiospores, cheilocystidia with median construction,
and broadly utriform and clavate to narrowly utriform pleurocystidia and
epithelioid hymeniderm pileipellis. Its placement as a new taxon of
Collybiopsis is confirmed by phylogenetic analyses of ITS and nrLSU
sequences. Two new combinations, Collybiopsis ugandensis and Collybiopsis
pleurocystidiata are also proposed as these species are transferred from
Gymnopus.