@article {148,
	title = {Isoetes prototypus, a new diploid species from eastern Canada},
	journal = {Canadian Journal of Botany},
	volume = {69},
	year = {1991},
	note = {Cited By (since 1996):8Export Date: 11 November 2013Source: Scopus},
	month = {1991///},
	pages = {277 - 281},
	abstract = {The species is found deep ({\textpm}2 m) in cool lakes in New Brunswick and Nova Scotia. -from Authors},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0026014413\&partnerID=40\&md5=adb4c7e4d89bfcecdf225220a8e1cda2},
	author = {Britton, D.M. and Goltz, J.P.}
}
@article {158,
	title = {Spore morphology and taxonomy of Isoetes in northeastern North America.},
	journal = {Canadian Journal of Botany},
	volume = {61},
	year = {1983},
	note = {Cited By (since 1996):26Export Date: 11 November 2013Source: Scopus},
	month = {1983///},
	pages = {3140 - 3163},
	abstract = {Taxonomy of Isoetes largely rests on megaspore and microspore wall ornamentation and spore size. These characters are reevaluated and the range of their variability is described (SEM photographs). Eight species of Isoetes are recognized for NE North America: I. macrospora, I. hieroglyphica, I. tuckermanii, I. riparia, I. acadiensis, I. echinospora, I. eatonii and I. engelmannii. Each species is provided with a revised list of synonyms, description, ecological notes and distribution maps. A key to species is provided. -from Authors},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0020901416\&partnerID=40\&md5=1639339936055b4de2712b81625e2497},
	author = {Kott, L. and Britton, D.M.}
}
@article {160,
	title = {A comparative study of spore germination of some Isoetes species of northeastern North America.},
	journal = {Canadian Journal of Botany},
	volume = {60},
	year = {1982},
	note = {Cited By (since 1996):4Export Date: 11 November 2013Source: Scopus},
	month = {1982///},
	pages = {1679 - 1687},
	abstract = {Taxa with higher chromosome numbers (decaploid, Isoetes macrospora; tetraploids, I. tuckermanii and I. riparia) showed higher overall megaspore germination in the 70-day test period, for both cold and control samples. I. macrospora and I. tuckermanii megaspores germinated without a cold pretreatment, while I. acadiensis, I. riparia and I. echinospora required a cold period to germinate.-from Authors},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0020385114\&partnerID=40\&md5=b1a0e301c5c7aab5586014f5d8fd8a03},
	author = {Kott, L.S. and Britton, D.M.}
}
@article {130,
	title = {The status, distribution, and identification of Georgia Quillwort (Isoetes georgiana; Isoetaceae)},
	journal = {American Fern Journal},
	volume = {86},
	year = {1996},
	note = {Cited By (since 1996):5Export Date: 11 November 2013Source: Scopus},
	month = {1996///},
	pages = {105 - 113},
	abstract = {Although recently described from only a single population, Isoetes georgiana is now known in at least 12 additional locations on the Georgia coastal plain. The distribution and habitat characteristics of these populations are described. Field and SEM examinations are employed to provide elaboration of the limited morphological and ecological information published to date. Speculation on the probable allopolypoid origin of Isoetes georgiana also is offered. It remains a locally distributed and rare species which may qualify for listing under the U.S. Endangered Species Act.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0347105301\&partnerID=40\&md5=6d316f38d99032ba8a03e94d7d877dd9},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {133,
	title = {Taxonomy, identity, and status of Isoetes virginica (Isoetaceae)},
	journal = {Castanea},
	volume = {61},
	year = {1996},
	note = {Cited By (since 1996):6Export Date: 11 November 2013Source: Scopus},
	month = {1996///},
	pages = {145 - 160},
	abstract = {The quillwort Isoetes virginica was described from material from a single location in west central Virginia in 1937. Subsequent treatments have considered it to be either a rare Virginia endemic, a synonym of Isoetes melanopoda or as a broadly defined taxon including the Piedmont endemic Isoetes piedmontana. The discovery of a new population near the type locality and rediscovery of an historical station has permitted cytological and ecological investigations of the original species concept. These investigations establish that Isoetes virginica is tetraploid and provide additional morphological and ecological evidence for this distinct species. Characteristics separating Isoetes virginica from the morphologically similar Isoetes piedmontana and Isoetes melanopoda are discussed. A lectotype for Isoetes virginica is designated. This pteridophyte is considered a Virginia endemic with a total known population of about 350 plants.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0030432806\&partnerID=40\&md5=41e631047e913bf96b59884bb8643408},
	author = {Brunton, D.F. and Britton, D.M. and Wieboldt, T.F.}
}
@article {134,
	title = {Taxonomy and Distribution of Isoetes valida},
	journal = {American Fern Journal},
	volume = {86},
	year = {1996},
	note = {Cited By (since 1996):7Export Date: 11 November 2013Source: Scopus},
	month = {1996///},
	pages = {16 - 25},
	abstract = {Isoetes valida constitutes an earlier valid name for I. caroliniana. This emergent aquatic, diploid quillwort is known from nine states along the Appalachian Mountains and Piedmont, growing in cold streams, mountain woodland ponds and in the saturated organic ooze of springs from central Pennsylvania to northeastern Alabama. It exhibits a distribution similar to several other endemic Appalachian pteridophytes. Disjunct populations are also known from the Coastal Plain of southeastern Alabama and Delaware. Although similar in appearance to I. engelmannii, I. valida is typically distinguished by its raggedly reticulate megaspore ornamentation, its velum covering 50\% or more of the unmarked sporangium wall, and spinulose microspores.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0040732154\&partnerID=40\&md5=5b1ed779661b2512493ef8631acf4998},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {137,
	title = {Isoetes X marensis, a new interspecific hybrid from western Canada},
	journal = {Canadian Journal of Botany},
	volume = {73},
	year = {1995},
	note = {Cited By (since 1996):9Export Date: 11 November 2013Source: Scopus},
	month = {1995///},
	pages = {1345 - 1353},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028813949\&partnerID=40\&md5=431547aab6696e0021e1312648947d9c},
	author = {Britton, D.M. and Brunton, D.F.}
}
@article {141,
	title = {Isoetes hyemalis sp. nov. (Isoetaceae): a new quillwort from the southeastern United States},
	journal = {Castanea},
	volume = {59},
	year = {1994},
	note = {Cited By (since 1996):13Export Date: 11 November 2013Source: Scopus},
	month = {1994///},
	pages = {12 - 21},
	abstract = {Isoetes hyemalis sp. nov., is described from deciduous and mixed forest swamps. Populations are known from Virginia, South Carolina, and North Carolina with the greatest number occurring in the latter. Ecological, morphological, and geographic characteristics are described and discussed. -from Authors},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0028557718\&partnerID=40\&md5=c85aca50f0892224e4c64bf446144f72},
	author = {Brunton, D.F. and Britton, D.M. and Taylor, W.C.}
}
@article {118,
	title = {Isoetes microvela (Isoetaceae), a new quillwort from the coastal plain of the southeastern United States},
	journal = {Rhodora},
	volume = {100},
	year = {1998},
	note = {Cited By (since 1996):7Export Date: 11 November 2013Source: Scopus},
	month = {1998///},
	pages = {261 - 275},
	abstract = {Isoetes microvela, sp. nov., is described from cytologically confirmed hexaploid populations from the coastal plain of North Carolina. At least one population grows over thinly-buried calcareous bedrock, a rare condition on the predominantly acidic southeastern coastal plain. It is a large quillwort of periodically inundated and scoured stream banks and shallow water. It is characterized by a densely short-crested to reticulate-tuberculate megaspore ornamentation pattern intermediate in appearance between that of I. appalachiana and I. hyemalis, an exceptionally small velum covering {\textpm} 10\% of the heavily brown-streaked sporangium, and by obscurely tuberculate microspores. A key to the Isoetes of the southeastern coastal plain is presented. Isoetes microvela is suspected to represent an allopolyploid derived from the doubling of a sterile triploid hybrid, most likely I. {\texttimes}bruntonii (= I. engelmannii {\texttimes} I. hyemalis) or I. appalachiana {\texttimes} I. engelmannii. Isoetes microvela is a rare species, presently known from only two populations.},
	keywords = {Coastal plain endemic, Isoetaceae, Isoetes microvela, North Carolina, Pteridophyte},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0013638592\&partnerID=40\&md5=a11db8019e87e506ac5ab36185a8c4de},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {123,
	title = {Appalachian quillwort (Isoetes appalachiana, sp. nov.; Isoetaceae), a new pteridophyte from the eastern United States},
	journal = {Rhodora},
	volume = {99},
	year = {1997},
	note = {Cited By (since 1996):10Export Date: 11 November 2013Source: Scopus},
	month = {1997///},
	pages = {118 - 133},
	abstract = {Isoetes appalachiana, sp. nov., is an element of the I. engelmannii complex of North America. Its distinct cytology, spore morphology, and distribution are illustrated and described. Although widely distributed in the eastern United States, it appears to be most common in the Appalachian Mountains. Isoetes appalachiana is tetraploid; it is suspected to be an allopolyploid which evolved from the chromosome doubling of I. X altonharvillii, the sterile hybrid between I. engelmannii (s. str.) and I. valida.},
	keywords = {Appalachian Mountains, Isoetaceae, Isoetes appalachiana, Pteridophyte},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0013681071\&partnerID=40\&md5=ca09a6b7a394918dfcfa73009b9ad85b},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {127,
	title = {Spore Morphology and Cytology of Isoetes Azorica (Pteridophyta Isoetaceae) and ITS Affinity with North America},
	journal = {Fern Gazette},
	volume = {15},
	year = {1996},
	note = {Cited By (since 1996):4Export Date: 11 November 2013Source: Scopus},
	month = {1996///},
	pages = {113 - 118},
	abstract = {Isoetes azorica is an endemic of shallow, oligotrophic lakes in the Azores Islands. Cytological investigations determine it to be tetraploid (2n=44). Morphological studies indicate that it shares many characteristics with the North American tetraploid I, tuckermanii. The spore morphology of both species is illustrated by SEM and their degree of similarity discussed. The apparently close affinity between these two taxa is consistent with phytogeographic patterns noted with few other pteridophytes of this region.},
	keywords = {Cytology, Isoetes azorica, Phytogeography, Spore morphology},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-1542470773\&partnerID=40\&md5=3162bdf0c559fb8cc27d38e86e6faeba},
	author = {Britton, D.M. and Brunton, D.F.}
}
@article {111,
	title = {Isoetes xechtuckerii, hyb. nov., a new triploid quillwort from northeastern North America},
	journal = {Canadian Journal of Botany},
	volume = {77},
	year = {1999},
	note = {Cited By (since 1996):4Export Date: 11 November 2013Source: Scopus},
	month = {1999///},
	pages = {1662 - 1668},
	abstract = {A new interspecific Isoetes hybrid, I. echinospora Dur. x I. tuckermanii A. Br., is described from northeastern North America by means of cytology and the scanning electron microscopy of spores. Isoetes xechtuckerii D.F. Brunton and D.M. Britton, hyb. nov., is the name proposed for this taxon. It is triploid, produces only aborted, sterile spores and has spore ornamentation intermediate between that of its putative parents. Populations have been identified in eastern Canada and the adjacent United States of America growing in association with one or both parents in shallow, fresh water along oligotrophic lake and river shores.},
	keywords = {Canada, Interspecific hybrid, Isoetes xechtuckerii, United States of America},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0033507630\&partnerID=40\&md5=908cd1a8a59822ee700bd0d818875093},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {112,
	title = {Rush quillwort (Isoetes junciformis, sp. nov.), a new pteridophyte from Southern Georgia},
	journal = {American Fern Journal},
	volume = {89},
	year = {1999},
	note = {Cited By (since 1996):4Export Date: 11 November 2013Source: Scopus},
	month = {1999///},
	pages = {187 - 197},
	abstract = {A previously undescribed pteridophyte, Isoetes junciformis, is reported from Tift County, Georgia. This new tetraploid appears to be a rare endemic of the upper Coastal Plain region. It is suspected to be an allopolyploid, possibly arising from the hybrid between I. flaccida and I. melanopoda.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0040322022\&partnerID=40\&md5=047fbe12b3c7afa03fe6de775a9a52c7},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {114,
	title = {Isoetes in Alaska and the Aleutians},
	journal = {American Fern Journal},
	volume = {89},
	year = {1999},
	note = {Cited By (since 1996):5Export Date: 11 November 2013Source: Scopus},
	month = {1999///},
	pages = {133 - 141},
	abstract = {Three species of Isoetes are recognized as present in the study area: I. echinospora Durieu diploid, 2n = 22), I. maritima Underw. (tetraploid, 2n = 44) and I. occidentalis L.F. Hend. (hexaploid, 2n = 66). Three interspecific hybrids are expected and two are known to be present: I. Xpseudotruncata D.M. Britton \& D.F. Brunton (triploid, 2n = 33) and I. Xtruncata (Eaton) Clute (pentaploid, 2n = 55). The missing hybrid taxon is I. echinospora (diploid)I. occidentalis (hexaploid).},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0008927385\&partnerID=40\&md5=a9775f2c1cc90773eb8ea0262ee7cd74},
	author = {Britton, D.M. and Brunton, D.F. and Talbot, S.S.}
}
@article {62,
	title = {Isoetes x novae-angliae (Isoetaceae), an additional hybrid quillwort from New England},
	journal = {Rhodora},
	volume = {108},
	year = {2006},
	note = {Export Date: 11 November 2013Source: Scopus},
	month = {2006///},
	pages = {228 - 241},
	abstract = {Isoetes x novae-angliae D.F. Brunt. \& D.M. Britton, hyb. nov., represents a sterile hybrid between the tetraploid aquatic pteridophytes I. riparia and I. tuckermanii. It is known only from North Easton, Massachusetts although it formerly likely occurred across the state as well as in Connecticut and southern New Hampshire. Determination of the distribution and nomenclature of this taxon also clarifies the status of a number of early 20th century taxonomic innovations.},
	keywords = {Hybrid, Isoetaceae, Isoetes x novae-angliae, New England, Pteridophyte},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33750506895\&partnerID=40\&md5=cfb8fb103c449613c66501a4a452c5a6},
	author = {Brunton, D.F. and Britton, D.M.}
}
@article {66,
	title = {Isoetes melanopoda spp. silvatica (subsp. nov.), A new quillwort (Isoetaceae) from eastern North America},
	journal = {Castanea},
	volume = {71},
	year = {2006},
	note = {Export Date: 11 November 2013Source: Scopus},
	month = {2006///},
	pages = {15 - 30},
	abstract = {Isoetes melanopoda, a diploid species of ephemeral prairie wetland swales primarily in central North America, has also been found in swamp forests over a wide area of eastern North America in recent years. Determination of certain morphological and ecological characteristics (leaf width, habitat preference, leaf base color, megaspore ornamentation pattern, and megaspore size) distinguishes two population groupings within the species range that maintain discreet geographic distributions and thus represent distinct taxa. Most populations of these two eastern and western taxa are distinctive enough to argue for identification as separate species within I. melanopoda (s.l.). The existence of some apparently intermediate populations within a transition zone between the two taxa and the absence of stand-alone diagnostic identification features, however, indicates that a subspecific level of distinction is more appropriate. Isoetes melanopoda subsp. silvatica, subsp. nov., is proposed for the previously unnamed eastern taxon.},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-33744742329\&partnerID=40\&md5=7aca3325d15a4c88962a29a94fd39f25},
	author = {Brunton, D.F. and Britton, D.M.}
}
