Monogramma graminea (Pteridaceae): типификация названия и морфология спор

doi:10.31857/S0006813621020046

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DOI Доступ к ресурсу на сайте издателя			10.31857/S0006813621020046

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Title: Monogramma graminea (Pteridaceae): типификация названия и морфология спор
Title: Monogramma graminea (Pteridaceae): name typification and spore morphology
Creator: Гуреева, Ирина Ивановна
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Соколова, Ирина Викторовна (биолог)
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Ваганов, Алексей Владимирович
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Кузнецов, Александр Александрович (ботаник)
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Романец, Роман Сергеевич
Date: 2021
DOI: 10.31857/S0006813621020046
Description: Herbarium specimens of Monogramma graminea (Poir) Schkuhr (Vittarioideae, Pteridaceae) from the collection of the Herbarium LE (V.L. Komarov Botanical Institute of RAS, Saint-Petersburg) and digital images of the herbarium specimens of M. graminea from the Herbaria P (Muséum National d’Histoire Naturelle, Paris) and BM (Natural History Museum, London) were analyzed. The collections contain six specimens collected by Ph. Commerson on Ile-de-France Island and representing the original material of Pteris graminea – the basionym of Monogramma graminea. The lectotype of Pteris graminea is designated here by I.I. Gureyeva, I.V. Sokolova, and A.V. Vaganov: “Ile de France. Herb. Commerson” (P: Р00674761). Four more specimens were identified as syntypes: P01344296; P01344312, left lower plant; P01420498 (all from P); BM000605316 (BM); LE00050576, upper plant (LE). The spores of the M. graminea specimen stored in LE were studied using scanning electron microscopy (SEM). The spores are trilete, tetrahedral. In equatorial position, the distal side of the spores is hemispherical, proximal one is conical; in proximal-polar and distal-polar positions, the spores are rounded-triangular, the surface of the spores between the laesura arms is slightly depressed. The equatorial diameter is 34.5(32.2– 35.7) μm, the polar axis is 33.0(32.4–33.7) μm, the laesura arms are prominent, straight, 19.3(18.8–20.1) μm long, 1.2(1.0–1.5) μm wide. The exospore without sculpture, its surface is plain, smooth or slightly granulate. Perispore abraded, remaining on the spore surface as the small fragments. M. graminea is similar in spore characteristics to four Haplopteris species: H. guineensis (Desv.) E.H. Crane, H. humblotii (Hieron.) S. Linds. et C.W. Chen, H. schliebenii (Reimers) Schuettp. and H. volkensii (Hieron.) E.H. Crane, which, like Monogramma graminea, have an African-Indian Ocean range, and differ from Asian-Pacific species of Haplopteris with bilateral spores, including H. dareicarpa (Hook.) S. Linds. et C.W. Chen, recently transferred in this genus from Monogramma.