Xanthagaricus pakistanicus sp. nov. (Agaricaceae): first report of the genus from Pakistan

Authors : SHAH HUSSAIN, NAJAMULSAHAR AFSHAN, HABIB AHMAD, HASSAN SHER, ABDUL KHALID

Pages : 123-133

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Xanthagaricus pakistanicus is described as a new species from lowland northern Pakistan, based on morphological and molecular data. It is characterized by a yellowish pileus, covered with dark brown squamules, a stipe with yellowish fibrils, globose basidiospores, and pileal squamules made up of pseudoparenchymatous epithelium with encrusted walls. Molecular phylogenetic trees were inferred based on nucleotide sequences of the internal transcribed spacer insert ignore into journalissuearticles values(ITS1-5.8S-ITS2); region and 28S nuclear ribosomal DNA. In phylogenetic analyses the genus Hymenagaricus sensu lato insert ignore into journalissuearticles values(s. l.); was inferred as a nonmonophyletic group and recovered in two monophyletic clades, consisting of species of the genera Xanthagaricus and Hymenagaricus sensu stricto insert ignore into journalissuearticles values(s. str.);. On account of the pileal squamule structure insert ignore into journalissuearticles values(pseudoparenchymatous epithelium); and yellowish basidiospores, and the phylogenetic position in the Xanthagaricus clade the new species X. pakistanicus belongs to the genus Xanthagaricus. Morphoanatomical comparison with the known species of Xanthagaricus is provided. We also made six new combinations in Xanthagaricus: X. calicutensis, X. epipastus, X. ochraceoluteus, X. rufomarginatus, X. subaeruginosus, and X. taiwanensis. With this study the number of known species in the genus Xanthagaricus increases to 19.
Keywords : Agaricales, Malakand, new taxon, phylogeny, taxonomy