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Isoetes microvela (Isoetaceae), a new quillwort from the coastal plain of the southeastern United States

Publication Type:Journal Article
Year of Publication:1998
Authors:D. F. Brunton, Britton D. M.
Pagination:261 - 275
Date Published:1998///
Keywords:Coastal plain endemic, Isoetaceae, Isoetes microvela, North Carolina, Pteridophyte

Isoetes microvela, sp. nov., is described from cytologically confirmed hexaploid populations from the coastal plain of North Carolina. At least one population grows over thinly-buried calcareous bedrock, a rare condition on the predominantly acidic southeastern coastal plain. It is a large quillwort of periodically inundated and scoured stream banks and shallow water. It is characterized by a densely short-crested to reticulate-tuberculate megaspore ornamentation pattern intermediate in appearance between that of I. appalachiana and I. hyemalis, an exceptionally small velum covering ± 10% of the heavily brown-streaked sporangium, and by obscurely tuberculate microspores. A key to the Isoetes of the southeastern coastal plain is presented. Isoetes microvela is suspected to represent an allopolyploid derived from the doubling of a sterile triploid hybrid, most likely I. ×bruntonii (= I. engelmannii × I. hyemalis) or I. appalachiana × I. engelmannii. Isoetes microvela is a rare species, presently known from only two populations.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith