New varieties of Diphasiastrum zeilleri (Rouy) Holub (Lycopodiaceae)

Yu. A. Ivanenko

DOI: https://doi.org/10.31111/novitates/2016.47.5

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Abstract

Diphasiastrum zeilleri (Rouy) Holub is a hybrid species, with the formula D. complanatum (L.) Holub × D. tristachyum (Pursh) Holub. A high variability of D. zeilleri is due to environmental conditions (light and shadow ecological forms) and probably to introgressive hybridization with the parental species. Intermediate forms between D. zeilleri, D. complanatum and D. tristachyum are quite rare, that allows to treat the three taxa as separate species. D. zeilleri is missing in subarctic regions of Europe and North America, and some degree of its resemblance with D. complanatum subsp. montellii Kukk. is convergent. Lycopodium complanatum f. polystachyum H. Lindb. is considered to belong to D. zeilleri, and an appropriate conbination is published, Diphasiastrum zeilleri var. polystachyum (H. Lindb.) Ivanenko.

A new variety Diphasiastrum zeilleri (Rouy) Holub var. ramistachyum Ivanenko is described, differing by sessile strobili formed on the basal part of fertile branches during one growing season. The structure, the base of which is a fertile branch, and the upper part is strobilus (strobili), is proposed to term «strobilus branch». Besides D. zeilleri var. ramistachyum, the strobilus branches are produced by D. issleri (Rouy) Holub, D. oellgaardii Stoor, Boudrie, Jérôme, K. Horn et Bennert, and rarely by D. alpinum (L.) Holub and D. complanatum.

Key words: Diphasiastrum, Lycopodiaceae, variability, variety

How to cite

Ivanenko Yu. A. 2016. New varieties of Diphasiastrum zeilleri (Rouy) Holub (Lycopodiaceae)//Novitates Syst. Pl. Vasc. Vol. 47. P. 5–21. https://doi.org/10.31111/novitates/2016.47.5

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