@article {linew,
	title = {New Observation of Megaspore Morphological Characteristics in Isoetes yunguiensis},
	journal = {Bulletin of Botanical Research},
	volume = {33},
	year = {2013},
	pages = {271-273},
	abstract = {<p>New megaspore morphological characteristics of the protected plant\&mdash;Isoetes yunguiensis were observed using scanning electron microscope (SEM). The result indicates: globular granule on megaspore surface; inapparent reticulate ornamentation; inapparent reticulate ornamentation with big size. Megaspore of the old ligulate heterosporophyte are easy to significantly change in size, ornamentaion and fissure.</p>
},
	keywords = {Isoetes yunguiensis, Megaspore, morphological characteristics},
	author = {LI, Xiao-Dong and SUN, Hao and ZHANG, Da-Wei and LIU, Bao-Dong}
}
@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.}
}
