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Intermediates between the Pleurocarpous Mosses Dichelyma falcatum (Hedw.) Myr. and D. capillaceum (Dicks.) Myr., Possible of Hybrid Origin

Kristoffer Hylander
Lindbergia
Vol. 24, No. 2 (1999), pp. 59-64
Published by: Oikos Editorial Office
Stable URL: http://www.jstor.org/stable/20150005
Page Count: 6
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Abstract

Phenotypically deviating specimens of the pleurocarpous moss genus Dichelyma from the River Dalälven in Sweden are compared with reference material of Dichelyma capillaceum (Dicks.) Myr. and D. falcatum (Hedw.) Myr. from other parts of Sweden. The phenotypes from Dalälven are intermediate between the two species with respect to relative width and degree of excurrency of the costa. The specimens are also larger than typical ones of either of the two species. The intermediate specimens are close to D. falcatum in absolute width of the leaves. The leaves are longer than those of D. falcatum and in the upper range of the variation among specimens of D. capillaceum. A likely explanation for these patterns is that the specimens are of hybrid origin, but they could also be autopolyploids or strongly deviating specimens of D. capillaceum or D. falcatum.

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