01198nas a2200193   4500008004100000245011500041210006900156260001200225300001400237490000700251520052100258653001300779653002000792653001900812653002100831100001800852700001800870856011600888       1996                        eng d00aSpore Morphology and Cytology of Isoetes Azorica (Pteridophyta Isoetaceae) and ITS Affinity with North America0 aSpore Morphology and Cytology of Isoetes Azorica Pteridophyta Is  c1996///  a113 - 1180 v153 aIsoetes azorica is an endemic of shallow, oligotrophic lakes in the Azores Islands. Cytological investigations determine it to be tetraploid (2n=44). Morphological studies indicate that it shares many characteristics with the North American tetraploid I, tuckermanii. The spore morphology of both species is illustrated by SEM and their degree of similarity discussed. The apparently close affinity between these two taxa is consistent with phytogeographic patterns noted with few other pteridophytes of this region.10aCytology10aIsoetes azorica10aPhytogeography10aSpore morphology1 aBritton, D.M.1 aBrunton, D.F.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-1542470773&partnerID=40&md5=3162bdf0c559fb8cc27d38e86e6faeba02208nas a2200217   4500008004100000245005800041210005600099260001200155300001400167490000700181520157700188653001001765653001401775653001201789653001101801653002101812100001201833700001201845700001601857856011701873       2008                        eng d00aSpore morphology of Isoëtes (isoëtaceae) from China0 aSpore morphology of Isoëtes isoëtaceae from China  c2008///  a479 - 4890 v463 aMicromorphological characters of mega- and microspores of five Isoëtes species from China were observed under scanning electron microscope (SEM). Megaspores of I. hypsophila have a levigate ornamentation, and are 358 μm in diameter (mean, n=30), microspores of this species have a gyrus ornamentation, and are 22 μm in length (mean, n=30); megaspores of I. yunguiensis have a cristate-reticulate ornamentation, with a size of 390 μm in diameter (mean, n=30), while microspores nearly smooth with some fine granulates, and with a size of 22 gm in length (mean, n=30); megaspores of I. taiwanensis are tuberculate and 312 μm in diameter (mean, n=30), echinate microspores are 24 μm in length (mean, n=30); cristate megaspores of I. sinensis are 409 μm in diameter (mean, n=30), and echinate microspores are 28 μm in length (mean, n=30); megaspores of I. orientalis have a cristate-reticulate ornamentation, with diameter of 420 μm (mean, n=30), microspores of this species have an echinate-tuberculate ornamentation with a size of 34 μm in length (mean, n=30). Based on the morphological characters of spores and chromosome numbers among taxa, it was found that mean spore size in each species of Isoëtes generally reflected the ploidy level. I. hypsophila, I. yunguiensis and I. taiwanensis, with smaller mean spore size, are diploidy with 2n=22; I. sinensis (2n=44) and I. orientalis (2n=66), with larger mean spore size, are polyploidy. The spore morphology of Isoëtes still plays an important role in identification and classification of Isoëtes from China.10aChina10aEvolution10aIsoetes10aOrigin10aSpore morphology1 aLiu, X.1 aLiu, H.1 aWang, Q.-F.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-57349117891&partnerID=40&md5=f310ff0165e440259efb4b7c64314743