@article {94,
	title = {Ornamentation of Isoetes (Isoetaceae, Lycophyta) microspores},
	journal = {Botanical Review},
	volume = {68},
	year = {2002},
	note = {Cited By (since 1996):6Export Date: 11 November 2013Source: Scopus},
	month = {2002///},
	pages = {474 - 487},
	abstract = {More than any other taxonomic character, megaspores have been used in the genus Isoetes (known by the English common name of "quillwort"), despite the fallacy of a single-character taxonomy. Microspores, on the other hand, have been largely neglected in taxonomic schemes. Like megaspores, terms for microspore ornamentation (also known as "sculpturing") have not been standardized. I examined microspore ornamentation, including both macroornamentation and microornamentation, of 52 taxa from Africa, Asia, Australasia, Europe, North America, and South America with the scanning electron microscope. Macroornamentation is discernible with light microscopy; microornamentation requires scanning electron microscopy. Ornately sculptured spores were much more frequent than were laevigate or psilate patterns: 21 taxa had an echinate pattern; 19 had an aculeate pattern; 6 were cristate; 5 were psilate; and 1 was laevigate. The proximal and distal ridges and surfaces may vary in both the type and density of ornamentation, Distinct macroornamentation patterns characterize certain species groups. Microornamentation types include granulate, bacillate, fimbriate, and filamentose: of the microspores I examined, virtually all were partially granulate; 11 were bacillate; 4 were fimbriate; and 1 was filamentose. Based on this limited sampling, species with a higher ploidy level often have larger microspores, but no clear relationship between microspore ornamentation and ploidy level was established, nor were any geographical or ecological trends clear. Like megaspores, microspore ornamentation is strongly convergent. Although microspores are often attached to megaspores, the role of spore ornamentation in coordinated dispersal remains unclear.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0038477121\&partnerID=40\&md5=08737b87419374ccf0b09e2b6b6699d8},
	author = {Musselman, L.J.}
}
@article {63,
	title = {Microspore morphology of Isoetes species (Lycophyta) from Southern South America},
	journal = {Botanical Review},
	volume = {72},
	year = {2006},
	note = {Cited By (since 1996):5Export Date: 11 November 2013Source: Scopus},
	month = {2006///},
	pages = {121 - 134},
	abstract = {Microspores of the 24 species of Isoetes that grow in southern South America were analyzed under a light microscope and scanning electron microscope. The microspores are monolete, elliptic in polar view, 30-40 μm long, and 20-25 μm wide. A background with various characteristics is seen on each surface. A supra-laesural expansion is present. The perispore is ornamented and has a perforated background. In section, it has a lacunose structure. The exospore is smooth, and it has a compact structure in section. The studied species could be divided into three groups by their perispore ornamentation: equinate, rugulate, and tuberculate. Microspore size was positively correlated with increasing ploidy level, and larger microspores were associated with terrestrial habitats. A convergence in ornamentation was found between spores produced by the studied species and those that grow in regions outside of the area under study. {\textcopyright} 2006 The New York Botanical Garden.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746007149\&partnerID=40\&md5=89828b318fcdc3d646eb9f235b2e34ee},
	author = {MacLuf, C.C. and Morbelli, M.A. and Giudice, G.E.}
}
@article {64,
	title = {Microspore morphology of Isoetes species (Lycophyta) from Southern South America. Part II. TEM analysis of some selected types},
	journal = {Botanical Review},
	volume = {72},
	year = {2006},
	note = {Cited By (since 1996):5Export Date: 11 November 2013Source: Scopus},
	month = {2006///},
	pages = {135 - 152},
	abstract = {The microspores of Isoetes escondidensis, I. gardneriana, I. herzogii, I. pedersenii, and I. savatieri were analyzed with transmission and scanning electron microscopy. The selected species were found to be representative of the diversity found in 24 taxa previously studied that grow in southern South America. The sporoderm is similar in the five types and is composed, from the outside to the inside, of perispore, para-exospore, exospore, and endospore. In I. escondidensis, I. gardneriana, I. herzogii, and I. savatieri, the perispore is lacunose, whereas in I. pedersenii, it is camerate. The para-exospore is formed of large superimposed and fused bars, which are more numerous and thicker in immature spores. The exospore shows uniform characteristics and a strongly contrasted cover. It has pluristratified zones on both sides of the aperture. The presence of radial rodlets between the para-exospore and exospore and in the supra-apertural chamber is described here for the first time. The endospore has a fibrillate or reticulate structure, or both structures may be present. A boundary within the fibrillate endospore is evident, which might be related to stages of deposition. The surface characteristics are formed by either the middle and outer strata of the perispore or elements on the outer surface, as in I. escondidensis. The characteristics of the microspore surface and of the perispore structure provide characteristics useful for systematic purposes at the infrageneric level. {\textcopyright} 2006 The New York Botanical Garden.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33746021654\&partnerID=40\&md5=26eb94864942b89e789f6d0eac8944dc},
	author = {MacLuf, C.C. and Morbelli, M.A. and Giudice, G.E.}
}
