The nothogenus ×Cyathidaria is established to accommodate various natural hybrids between species of Cyathea and Cnemidaria, all characterised by abortive spores and morphologically intermediate between their respective parent species. ×Cyathidaria acunae, the natural hybrid between Cnemidaria horrida and Cyathea aspera is a newly described nothospecies from Cuba. Four new combinations in ×Cyathidaria are made.
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