Evolution and speciation inPellia, with special reference to thePellia megaspora-endiviifoliacomplex (Metzgeriales), II. Cytology

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Abstract
A unique karyotype within the genus Pellia, both in terms of chromosome structure and in the distribution of heterochromatin as defined by Giemsa C-banding, supports the taxonomic recognition of P. megaspora. Resembling P. endiviifolia more closely than P. epiphylla or P. neesiana in its heterochromatin content, the species differs significantly in karyotype symmetry and the absence of an m-chromosome. Comparison of P. endiviifolia from Britain, Japan and Canada has identified clear and extensive evidence of cytological polymorphism.

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