@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 {36,
	title = {Morphology and ultrastructure of megaspores and microspores of isoetes sehnemii fuchs (lycophyta)},
	journal = {Anais da Academia Brasileira de Ciencias},
	volume = {82},
	year = {2010},
	note = {Cited By (since 1996):1Export Date: 11 November 2013Source: Scopus},
	month = {2010///},
	pages = {341 - 352},
	abstract = {The morphology and wall ultrastructure of megaspores and microspores of Isoetes sehnemii that grows in Brazil were analyzed as part of the study of the Isoetaceae present in Southern South America. The observations were performed with light, scanning and transmission electron microscopes. The megaspores are trilete, 350-450μm in equatorial diameter. The surface is reticulate. In section, the sporoderm is 100μm thick including the ornamentation. The wall is composed of a siliceous perispore, which consists of short fused flatten, elements forming a three-dimensional mesh. The exospore has two zones of different structure. The endospore is fibrillar. The microspores are monolete, 21-27μm in equatorial diameter. The sporoderm is composed of a sporopollinic rugulate perispore. A space between the para-exospore and the exospore is evident. The exospore is compact. The endospore is fibrillar. The ultrastructural analysis akes hoologies evident concerning structure and organization of the layers belo the perispore in both spore types. A possible similarity and stability in the ultrustructure of the present spores and fossils could be also inferred. In addition, there would be a correlation among the plant habitat, the spore ornamentation and the geographic distribution.},
	keywords = {Brazil, Isoetes, Lycophyta, Palynology, Sculpture, Spores, Ultrastructure},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77954194457\&partnerID=40\&md5=1434918a400d7fc28cb2b2ec5338958d},
	author = {Macluf, C. and Morbelli, M. and Giudice, G.}
}
