Rare Plants of Louisiana

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Rare Plants of Louisiana Diplazium lonchophyllum - lance-leaved glade fern Wood Fern Family (Dryopteridaceae) Rarity Rank: S1/G3G5 Range: LA; also Mexico, Central America, and northern South America Recognition: Relatively large attractive fern with glossy fronds Sori (clusters of sporangia) are on lateral veins and can be up to 6 mm in length Lacks scales on midrib of the fronds and pinnae (frond segments); Dryopteris ludoviciana, also a rare fern, has such scales Can further be separated from Dryopteris by having 1 or 2 vascular bundles in the petiole (seen in cross- section) rather than 3 to 7 bundles Teeth on the margins of the pinnae grow closer together towards the tip of each lobe and are more numerous on the upper edges of the lobes Light Requirement: Shade Wetland Indicator Status: Does not occur in wetlands anywhere in range Habitat: Rich wooded ravines in salt dome hardwood forests on Weeks and Cote Blanche Islands. Threats: Invasive plant species including Deparia petersenii (Japanese twin-sorus fern) Rooting by feral hogs Unnatural rates of erosion Beneficial Management Practices: Kill more wild hogs Protect remaining salt dome hardwood forest habitat Rare Plants of Louisiana LA River Basins: Vermilion-Teche Diplazium lonchophyllum growing beside a stream bed in a ravine on Weeks Island, Iberia Parish. References: NatureServe. 2007. NatureServe Explorer: An online encyclopedia of life [web application]. Version 6.2. NatureServe, Arlington, Virginia. Available http://www.natureserve.org/explorer. Thieret, J. W. 1980. Louisiana ferns and fern allies. Lafayette Natural History Museum, Lafayette, LA. 123 pp. Funding provided by the Louisiana Department of Wildlife and Fisheries and the Barataria-Terrebonne National Estuary Program For more information, please visit our Web pages at www.wlf.la.gov/wildlife/louisiana-natural-heritage-program or 225-765-2811 www.BTNEP.org or 1-800-259-0869 .

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Polystichum Perpusillum (Sect. Haplopolystichum, Dryopteridaceae), a New Fern Species from Guizhou, China
Ann. Bot. Fennici 49: 67–74 ISSN 0003-3847 (print) ISSN 1797-2442 (online) Helsinki 26 April 2012 © Finnish Zoological and Botanical Publishing Board 2012 Polystichum perpusillum (sect. Haplopolystichum, Dryopteridaceae), a new fern species from Guizhou, China Li-Bing Zhang1 & Hai He2,* 1) Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, Sichuan 610041, China; and Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, USA 2) College of Life Sciences, Chongqing Normal University, Shapingba, Chongqing 400047, China (*corresponding author’s e-mail: [email protected]) Received 20 Dec. 2010, final version received 23 Mar. 2011, accepted 24 Mar. 2011 Zhang, L. B. & He, H. 2012: Polystichum perpusillum (sect. Haplopolystichum, Dryopteridaceae), a new fern species from Guizhou, China. — Ann. Bot. Fennici 49: 67–74. Polystichum perpusillum L.B. Zhang & H. He, a new fern species of Polystichum sect. Haplopolystichum (Dryopteridaceae), is described and illustrated from the entrance to a karst cave in southern Guizhou, China. A phylogenetic analysis based on the chlo- roplast trnL-F sequences shows that it is phylogenetically isolated in the section with no close relatives. Morphologically, it is similar to P. minutissimum, but P. perpusillum has an acute lamina apex, up to 12 pairs of pinnae per lamina, and deltoid-ovate or ovate-lanceolate rachis scales, while P. minutissimum has a round lamina apex, 5–8 pairs of pinnae per lamina, and subulate or linear rachis scales. Polystichum perpusil- lum has a granulate sculpture with verrucae on its perispore, a sculpture rare in the genus. The species is considered to be critically endangered.
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