New cleistocarpous species of the genus Pterygoneurum (Pottiaceae, Bryophyta) from the steppe slopes of Siberia (Russia)


T. N. Otnyukova


DOI: https://doi.org/10.31111/nsnr/2020.54.1.251


Abstract

On the steppe slopes in the Yenisey River Basin in the vicinity of the City of Krasnoyarsk a new cleistocarpous species of the genus Pterygoneurum was found. The new species Pterygoneurum sibiricum is characterized by sessile cleistocarpous capsule, short triangular-cucullate calyptrae, and leaves loosely appressed and somewhat slightly twisted when dry, as well as papillose leaves and lamellae. It differs from all stegocarpous species of Pterygoneurum in a cleistocarpous capsule. It also differs from the cleistocarpous Pterygoneurum kozlovii in having high lamellae of 4–10(15) rows of cells in height (vs. low lamellae of 1–4 rows of cells in height in P. kozlovii); papillae of lamellae located on both sides of the lamellae, branched or sometimes simple (vs. simple to hardly branched or absent in P. kozlovii); papillae of the leaf lamina located on the dorsal side of the lamina, branched or sometimes simple (vs. mostly simple to hardly branched or absent in P. kozlovii). It is known from the steppe slopes in Siberia (Republic Sakha (Yakutia), Indigirka River Basin; Trans-Baikal Territory; Republic of Buryatia; Krasnoyarsk Territory, near the City of Krasnoyarsk).


Key words: Pterygoneurum arcticum, Pterygoneurum kozlovii, Pterygoneurum lamellatum, Pterygoneurum ovatum, Pterygoneurum sibiricum, Pterygoneurum subsessile, morphology, moss flora, taxonomy, Asia, Russia


Section: Bryophytes


How to cite

Otnyukova T. N. 2020. New cleistocarpous species of the genus Pterygoneurum (Pottiaceae, Bryophyta) from the steppe slopes of Siberia (Russia). Novosti sistematiki nizshikh rastenii 54(1): 251–260. https://doi.org/10.31111/nsnr/2020.54.1.251


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