@article {131,
	title = {Biosystematic studies on the genus Isoetes (Isoetaceae) in Japan. III. Variability within qualitative and quantitative morphology of spores},
	journal = {Journal of Plant Research},
	volume = {109},
	year = {1996},
	note = {Cited By (since 1996):10Export Date: 11 November 2013Source: Scopus},
	month = {1996///},
	pages = {281 - 296},
	abstract = {Qualitative and quantitative characteristics of mega- and microspores from all the cytotypes of Japanese Isoetes are described based on the voucher specimens whose chromosome numbers were known. In I. japonica, the hexaploid possessed reticulate megaspores and levigate microspores, while the octaploid and the heptaploid had echinate microspores. Mega- and microspores of the hexaploid and the octaploid were of normal appearance, while those of the heptaploid displayed polymorphism. The tetraploid and the hexaploid of I. sinensis resembled each other, since they both possessed cristate megaspores and echinate microspores. Echinate megaspores and levigate microspores characterized the diploid I. asiatica. The spore size was largely variable within each cytotype, while the size of the megaspores varied more than that of the microspores. The microspore length was closely correlated with polyploid level. In I. sinensis, the mean microspore length of the tetraploid was 27.6 μm while that of the hexaploid was 31.9 μm, hence these two cytotypes were easily distinguishable. In the hexaploid I. japonica, variations in mega- and microspore size displayed geoclinal variation showing a positive correlation (r=0.43-0.55) with the longitude and the latitude of the populations. A palynotogical key for cytotypes is presented.},
	keywords = {Cytotype, Isoetes, Megaspore, Microspore, Palynology, Polyploidy},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030495119\&partnerID=40\&md5=def6cedc48f4ad43b95e6e4eb0cbc75e},
	author = {Watanabe, M. and Takamiya, M. and Matsusaka, T. and Ono, K.}
}
@article {142,
	title = {Biosystematic studies on the genus Isoetes in Japan I. Variations of the somatic chromosome numbers},
	journal = {Journal of Plant Research},
	volume = {107},
	year = {1994},
	note = {Cited By (since 1996):17Export Date: 11 November 2013Source: Scopus},
	month = {1994///},
	pages = {289 - 297},
	abstract = {The somatic chromosome number of three Japanese species of Isoetes, I. asiatica, I. japonica and I. sinensis, was determined in 199 individuals from 49 populations. The chromosome number of I. asiatica was 2 n=22, confirming previous reports. However, I. japonica and I. sinensis displayed a diversity in chromosome number. Six cytotypes, 2 n=66, 67, 77, 87, 88 and 89, were found in I. japonica; 2 n=67, 87, 88 and 89 are new counts in the genus Isoetes. The plants with 2 n=66 were the most frequent (72\% of total individuals examined) and were distributed throughout Honshu and Shikoku. The plants with 2 n=88 occurred in western Honshu and a limited region in northeastern Honshu where the plants with 2 n=77 were also found. In contrast, four cytotypes, 2 n=44, 65, 66 and 68, were found in I. sinensis. The chromosome numbers of I. sinensis were reported here for the first time. The plants with 2 n=44 occurred only in Kyushu, while the plants with 2 n=66 were found throughout a large area of western Japan. {\textcopyright} 1994 The Botanical Society of Japan.},
	keywords = {Aneuploid, Chromosome number, Cytogeography, Isoetes, Polyploid, Pteridophyta},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-21844512580\&partnerID=40\&md5=5cb0d06bc24499fb20d76da2946e91ea},
	author = {Takamiya, M. and Watanabe, M. and Ono, K.}
}
