01760nas a2200205   4500008004100000245010900041210006900150260001200219300001400231490000800245520105000253653002601303653001501329653002201344653001901366653001701385100001801402700001801420856011601438       1998                        eng d00aIsoetes microvela (Isoetaceae), a new quillwort from the coastal plain of the southeastern United States0 aIsoetes microvela Isoetaceae a new quillwort from the coastal pl  c1998///  a261 - 2750 v1003 aIsoetes 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.10aCoastal plain endemic10aIsoetaceae10aIsoetes microvela10aNorth Carolina10aPteridophyte1 aBrunton, D.F.1 aBritton, D.M.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0013638592&partnerID=40&md5=a11db8019e87e506ac5ab36185a8c4de