Asplenium montanum X platyneuron, a new primary member of the Appalachian spleenwort complex from Crowder's mountain, N. c

The Appalachian spleenwort fern complex (Aspleniaceae: Asplenium) involves several basic diploid species and their derived allopolyploids. Only one of the sterile diploid primary hybrids has been reported previously. Herein is described for the first time Asplenium montanum X platyneuron from Crowde...

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Bibliographic Details
Published in:Journal of the Elisha Mitchell Scientific Society 1973-10, Vol.89 (3), p.218-223
Main Authors: Wagner, W.H. Jr, Wagner, F.S, Lankalis, J.A, Matthews, J.F
Format: Article
Language:English
Subjects:
Chromosomes
Diploidy
Epidermal cells
Ferns
Gametophytes
Hybridity
Metaphase
Plants
Rocks
Tetraploidy
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Summary:The Appalachian spleenwort fern complex (Aspleniaceae: Asplenium) involves several basic diploid species and their derived allopolyploids. Only one of the sterile diploid primary hybrids has been reported previously. Herein is described for the first time Asplenium montanum X platyneuron from Crowder's Mountain, Gaston Co., N.C., a locality ideal for the growth of spleenworts. Growing in association with its parents and with typical tetraploid A. X bradleyi, the new hybrid has only 2x = 72 chromosomes, these entirely unpaired at meiotic metaphase, and its spores are abortive. Resembling very closely typical A. X bradleyi, the new cytotype can be distinguished only by the chromosomes, the spores, and by the smaller epidermal cells and more or less unexpanded sori. The nomenclatural problem concerning these ferns is discussed, and it is concluded that the best treatment of the diploid hybrid would be as "Asplenium X bradleyi D. C. Eaton (sterile 2x)."
ISSN:0013-6220
2573-1130