title: Isoetes mississippiensis: A new quillwort from Mississippi, USA.
abstract: Isoetes mississippiensisS.W. Leonard, W.C. Taylor, L.J. Musselman and R.D. Bray (Isoetaceae, Lycopodiophyta) is a new species known from two sites along tributaries of the Pearl River in southern Mississippi. This species is distinguished from other species in the southeastern United States by a combination of character states including a basic diploid (2n=22) chromosome count, laevigate megaspores, and a narrow velum covering less than one-third of the adaxial sporangium wall.
authors.affiliation: Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266.
authors.forename: Peter W
authors.initials: PW
authors.lastname: Schafran
authors.affiliation: Wiggins, Mississippi 39577.
authors.forename: Steven W
authors.initials: SW
authors.lastname: Leonard
authors.affiliation: Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266.
authors.forename: Rebecca D
authors.initials: RD
authors.lastname: Bray
authors.affiliation: Department of Botany, National Museum of Natural History, Washington, DC 20560-0166.
authors.forename: W Carl
authors.initials: WC
authors.lastname: Taylor
authors.affiliation: Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266.
authors.forename: Lytton J
authors.initials: LJ
authors.lastname: Musselman
keywords: Isoetaceae; Isoetes; Mississippi; lycophyte; quillwort