Phytotaxa 447 (2): 137–145 ISSN 1179-3155 (print edition) https://www.mapress.com/j/pt/ PHYTOTAXA Copyright © 2020 Magnolia Press Article ISSN 1179-3163 (online edition) https://doi.org/10.11646/phytotaxa.447.2.6 A new species of Stemonitis pseudoflavogenita from Russia, and the first record of Stemonitis capillitionodosa in Eurasia ANASTASIA V. VLASENKO1,4*, YURI K. NOVOZHILOV2,5, ILYA S. PRIKHODKO2,6, VLADIMIR N. BOTYAKOV3,7 & VYACHESLAV A. VLASENKO1,8 1 Central Siberian Botanical Garden of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, 630090, Russia. 2 Komarov Botanical Institute of the Russian Academy of Sciences, St. Petersburg, 197376, Russia. 3 St. Petersburg Mycological Society, Krasnodar, 353730, Russia. 4 �
[email protected]; https://orcid.org/0000-0002-4342-4482 5 �
[email protected]; https://orcid.org/0000-0001-8875-2263 6 �
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[email protected]; https://orcid.org/0000-0002-9916-486X 8 �
[email protected]; https://orcid.org/0000-0001-5928-0041 * Corresponding author Abstract This paper reports a new Stemonitidaceae species, Stemonitis pseudoflavogenita, found in Krasnodar Territory and Novosibirsk Region of Russia. We provide morphological and molecular characterization of S. pseudoflavogenita and data on its distribution and habitat. Compared to other representatives of the genus Stemonitis, S. pseudoflavogenita and three other species of this genus (S. capillitionodosa, S. flavogenita, and S. sichuanensis) have thickening and widening of the column apex, which makes them a separate morphological group. However, the above three known species have warted and spinulose spore ornamentations, S. pseudoflavogenita shows complex ornamentation consisting of large warts and a few small warts irregularly scattered among the large ones and small indentations on the spore surface.