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1 January 2012 Two New Species of the Fern Genus Blechnum with Partially Anastomosing Veins from Northern Brazil
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Abstract

Two new species of Blechnum from Para State, northern Brazil, are described along with a diagnostic key and illustrations: Blechnum areolatum and B. longipilosum (Blechnaceae). Blechnum areolatum can be distinguished by: partially anastomosing veins, one or two pairs of pinnae and one- to two-celled hairs present only on the abaxial side of leaf blade. Blechnum longipilosum is characterized by: partially anastomosing veins, one to three pairs of reduced proximal pinnae and long hairs on rachises, costae, veins, laminar tissue, and indusia between sporangia. Both plants belong to the B. occidentale L. complex. Blechnum areolatum is similar to some specimens of B. lanceola Sw. with one pair of pinnae, but the veins in the latter species are completely free. Blechnum longipilosum has no known close relatives. The only Neotropical species so far known with partially anastomosing veins is B. heringeri Brade, which has erect rhizomes (vs. short creeping in B. longipilosum) and short, two- to three-celled hairs on leaf blades, which are deltoid and truncate at base. A key to the Neotropical species of Blechnum with partially anastomosing veins is provided.

© Copyright 2012 by the American Society of Plant Taxonomists
Vinícius Antonio de Oliveira Dittrich, Alexandre Salino, and Thais Elias Almeida "Two New Species of the Fern Genus Blechnum with Partially Anastomosing Veins from Northern Brazil," Systematic Botany 37(1), (1 January 2012). https://doi.org/10.1600/036364412X616602
Published: 1 January 2012
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