01649nas a2200193   4500008004100000245009000041210007000131260001200201300001200213490000700225520102500232653001501257653001201272653001401284653000901298100001401307700001801321856011601339       2002                        eng d00aPhylogeny of Isoëtes (Lycopsida): Resolving basal relationships using rbcL sequences0 aPhylogeny of Isoëtes Lycopsida Resolving basal relationships usi  c2002///  a83 - 890 v513 aThe phylogenetic relationships of Isoëtes (Isoëtaceae) were investigated by means of a cladistic analysis using plastid rbcL sequences and a representative sample of 18 species. The analysis supports a basal split in Isoëtes separating two main groups, one including aquatic species from South America (I. bradei and I. amazonica) and West Africa (I. kersii and I. schweinfurthii), and the other including aquatic, amphibious and terrestrial species representing all major continents. Higher level relationships remain unresolved, but supported groups do conflict with previous morphology-based hypotheses. Comparatively low levels of sequence divergence indicate that the use of more rapidly evolving regions will be required to resolve higher level relationships. The phylogenetically isolated nature of Isoëtes will in such analyses make standard outgroup comparisons problematic, and results presented here will in this respect prove important by providing support for choosing among alternative rooting options.10aIsoetaceae10aIsoetes10aPhylogeny10arbcL1 aRydin, C.1 aWikström, N.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0036254372&partnerID=40&md5=f4c2dc2699e8c72b00c4dccdb1f20c1f01460nas a2200265   4500008004100000245007800041210006900119260001200188300001400200490000700214520065700221653001600878653001200894653001800906653001000924653002700934653001400961653001100975653001600986100001701002700002101019700001701040700002001057856011701077       2005                        eng d00aTwo new species of the genus Isoetes L. (Isoetaceae-Lycopsida) from India0 aTwo new species of the genus Isoetes L IsoetaceaeLycopsida from   c2005///  a109 - 1160 v543 aTwo new, primitive quillwort species, I. udupiensis and I. divyadarshanii, are described from peninsular India. Cytologically both species are diploid and unique for India in having 22 chromosomes without fragments. Megaspores of both species are monomorphic, whereas in the previously described species, they are di-to polymorphic. Isoetes udupiensis is unique in having deltoid-shaped megaspores and dominant microspory. The similarity in morphology of both species to subgenus Euphyllum and to the remaining Indian species of subgenus Isoetes, suggests that they may be connecting links between primitive and derived forms within the genus in India.10aChromosomes10aDiploid10aI. udupiensis10aIndia10aIsoetes divyadarshanii10aPhylogeny10aSpores10aSystematics1 aShukla, P.K.1 aSrivastava, G.K.1 aShukla, S.K.1 aRajagopal, P.K.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-15944372672&partnerID=40&md5=cad8ccfe64fc2bc9f7b174901a9b815302184nam a2200205   4500008004100000245010800041210007100149260001200220300001400232490000700246520150100253653001701754653001501771653001201786653001401798100001501812700001701827700001701844856011701861       2006                        eng d00aPhylogeny and biogeography of Isoëtes (Isoëtaceae) based on nuclear and chloroplast DNA sequence data0 aPhylogeny and biogeography of Isoëtes Isoëtaceae based on nuclea  c2006///  a449 - 4600 v313 aDespite its ancient origins, worldwide distribution, and adaptation to diverse habitats, Isoëtes species have a highly conserved morphology, making it difficult to resolve phylogenetic relationships using morphological characters. In this paper, we report the results from various analyses (maximum parsimony, maximum likelihood, and Bayesian inference) for Isoëtes species from around the world based on nucleotide sequences from the nuclear internal transcribed spacer (ITS) and chloroplast atpB/rbcL intergenic spacer regions. The trees resulting from our analyses of the combined data contain six major well-supported clades (bootstrap ≥ 90%, posterior probabilities = 1.00): A clade with possible Gondwanan affinities (I. australis, I. coromandelina, I. panamensis, I. cubana, I. jamaicensis); a South African clade (I. capensis, I. toximontana, I. stellenbossiensis, I. stephansenii); a largely Northern Hemisphere clade (I. nuttallii, I. orcuttii, I. minima, I. dixitei, I. abyssinica, I. olympica, I. longissima, I. velata); an Asian/Australasian clade (I. drummondii, I. gunnii, I. pusilla, I. kirkii, I. muelleri, I. taiwanensis, I. japonica, I. yunguiensis, I. habbemensis); a Mediterranean clade (I. histrix and I. setacea); and a poorly resolved clade consisting of 12 new world species (American species complex). Our results are compared to past classifications and various biogeographical scenarios are explored. © Copyright 2006 by the American Society of Plant Taxonomists.10aBiogeography10aIsoetaceae10aIsoetes10aPhylogeny1 aHoot, S.B.1 aTaylor, W.C.1 aNapier, N.S.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-67650146436&partnerID=40&md5=c418d4b55db9dd7f2436a8d3189f1552