Two New Species of the Fern Genus Blechnumwith Partially Anastomosing Veins from Northern Brazil

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Two new species of Blechnumfrom Pará State, northern Brazil, are described along with a diagnostic key and illustrations: Blechnum areolatum and B. longipilosum (Blechnaceae). Blechnum areolatumcan 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 longipilosumis 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. occidentaleL. complex. Blechnum areolatumis similar to some specimens of B. lanceolaSw. with one pair of pinnae, but the veins in the latter species are completely free. Blechnum longipilosumhas 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 Blechnumwith partially anastomosing veins is provided.

Keywords: Blechnaceae; Brazilian Amazon; Neotropics; monilophytes; pteridophytes; taxonomy

Document Type: Research Article


Publication date: January 1, 2012

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