Abstract
THE D. spinulosa complex in Europe (cf. Manton1) consists of three tetraploid species (D. cristata, D. spinulosa and D. dilatata) and the hybrids between them, together with at least one diploid previously included in D. dilatata but probably deserving taxonomic separation.
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References
Manton, “Problems of Cytology and Evolution in the Pteridophyta” (Cambridge, 1950).
Fernald, M. L., “Gray's Manual of Botany”, 8th edit. (1950).
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MANTON, I., WALKER, S. Cytology of the Dryopteris spinulosa Complex in Eastern North America. Nature 171, 1116–1117 (1953). https://doi.org/10.1038/1711116a0
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DOI: https://doi.org/10.1038/1711116a0
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