Mycoscience: Advance Publication doi: 10.47371/mycosci.2021.03.003 Short Communication (Received November 4, 2020; Accepted March 15, 2021) J-STAGE Advance Published Date: May 7, 2021 Short communication Microstoma longipilum sp. nov. (Sarcoscyphaceae, Pezizales) from Japan Yukito Tochihara a, b, *, Tomoya Hirao c, Muneyuki Ohmae d, Kentaro Hosaka b, and Tsuyoshi Hosoya b a Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113- 0033, Japan b Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan c Mycologist Group in Okayama, 554-10 Tsubue, Kurashiki, Okayama 710-0034, Japan d Edible Mushrooms Institute, Hokken Co. Ltd., 1296-4, Oyamadashimogo, Nakagawa, Nasu, Tochigi 324-0602, Japan *E-mail:
[email protected] ABSTRACT Microstoma longipilum sp. nov. collected from two localities in Japan is described. It is characterized by long apothecial hairs and salmon pink discs. Molecular phylogenetic analyses supported the novelty of the fungus. We additionally reported the overlooked morphology of hyphal mats, conidiogenous cells produced directly from ascospores, and conidia. With the addition of M. longipilum, now six species of Microstoma are documented in Japan. Keywords: ITS-5.8S, mycobiota, new species, phylogeny The genus Microstoma Bernstein (Sarcoscyphaceae, Pezizales) is characterized by long stipes, white-hairy receptacles, orange to red discs, gelatinized ectal excipulum and ascospores with smooth surfaces (Otani, 1980). Seven species have been differentiated in the genus: M. aggregatum Otani, M. apiculosporum Yei Z. Wang, M. camerunense Douanla-Meli, M. floccosum (Sacc.) Raitv., M. macrosporum (Y. Otani) Y.