Biosystematic Studies on the Genus Isoetes (Isoetaceae) in Japan. IV. Morphology and Anatomy of Sporophytes, Phytogeography and Taxonomy.
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Accession number;99A0224141
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| Title;Biosystematic Studies on the Genus Isoetes (Isoetaceae) in Japan. IV. Morphology and Anatomy of Sporophytes, Phytogeography and Taxonomy. |
| Author;
TAKAMIYA M
(Kumamoto Univ., Kurokami, Jpn)
WATANABE M
(Kumamoto Univ., Kurokami, Jpn)
ONO K
(Kumamoto Univ., Kurokami, Jpn)
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Journal Title;Shokubutsu Bunrui, Chiri
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Journal Code:L2614A
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ISSN:0001-6799
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VOL.48;NO.2;PAGE.89-121(1997)
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| Figure&Table&Reference;FIG.42, TBL.1, REF.47 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Morphological and anatomical characteristics and geographical distribution patterns of Japanese Isoetes are described for each of the cytotypes which were determined in our previous cytological studies. A taxonomic treatment for Japanese Isoetes is given. We recognize six taxa of Isoetes in the Japanese flora: I. asiatica (2x), I. japonica (6x), a newly described species, I. pseudojaponica (8x), a newly described interspecific hybrid, I.*michinokuana (=I. japonica*I. pseudojaponica) (7x), I. sinensis var. sinensis (4x) and a new combination, I. sinensis var. coreana (6x). Isoetes pseudojaponica and I.*michinokuana are endemic to Japan and are characterized by both reticulate megaspores and echinate microspores. Isoetes pseudojaponica should reproduce sexually, while I.*michinokuana is a sterile, heptaploid hybrid. Isoetes sinensis var. coreana differs from var. sinensis in the larger size of its microspores, the longer length of its guard cells, and the structure of its leaves in cross section. (author abst.) |
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