01644nas a2200145   4500008004100000245016200041210006900203260001200272300001400284490000700298520104300305100001801348700001501366856011701381       2005                        eng d00aTaxonomic reassessment of North American granite outcrop Isoetes species with emphasis on vegetative morphology and I. Piedmontana (Pfeiffer) reed sensu lato0 aTaxonomic reassessment of North American granite outcrop Isoetes  c2005///  a204 - 2210 v703 aA taxonomic study of collections previously identified as Isoetes melanospora, I. piedmontana, and I. tegetiformans was undertaken emphasizing vegetative characters. The taxonomic position of I. piedmontana was also assessed using cytogeography and a cursory examination of the allozyme locus TPI-2. Isoetes melanospora, I. piedmontana, and I. tegetiformans can be sufficiently distinguished using characters derived from leaves and corms. Isoetes piedmontana occurs as diploid, triploid, and allotetraploid entities. Diploids in the western and eastern parts of the geographic range are genetically distinct. Allotetraploids in eastern Alabama are composed of different genomes than those in North Carolina. Isoetes piedmontana is currently interpreted as an assemblage of morphologically indistinguishable species and is undergoing further taxonomic investigation. The typification of I. piedmontana is clarified, and a key with descriptions of the granite outcrop Isoetes species of the southeastern United States Piedmont is provided.1 aHeafner, K.D.1 aBray, R.D.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-26844507369&partnerID=40&md5=bf4117785fa3f8ff3d4bb96bd79adbc301453nas a2200217   4500008004100000245010000041210006900141260001200210300001400222490000700236520073900243653001500982653001200997653001201009653002901021653001701050100001601067700001701083700001801100856011701118       2005                        eng d00aAnalysis of morphological and anatomical characteristics of Isoetes using isoetes tennesseensis0 aAnalysis of morphological and anatomical characteristics of Isoe  c2005///  a167 - 1820 v573 aThe three known populations of Isoetes tennesseensis were examined to document and analyze their morphological and anatomical characters. Characters examined included velum coverage, lacunae, leaf form and size, sporangial wall cells, and ligule and labium morphology. Three types of morphological patterns were found: stable, variable, and dimorphic. The discovery of dimorphism between mega- and microsporophylls for velum coverage, velum length, sporangium size, and ligule shape is of particular interest. This study presents a model for future work designed to complement current species descriptions and it establishes a baseline for morphological comparisons with other Isoetes. © 2005, by The New York Botanical Garden Press.10aDimorphism10aIsoetes10aLycopod10aMorphological characters10aPteridophyte1 aBudke, J.M.1 aHickey, R.J.1 aHeafner, K.D.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-21744447722&partnerID=40&md5=10d5e4181461bf404f341ea4a32c4740