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Two New Species of Orchidaceae from Brazil: Bulbophyllum carassense and Lepanthopsis vellozicola

Rubens Custódio da Mota, Fábio de Barros and João Renato Stehmann
Novon
Vol. 19, No. 3 (Sep., 2009), pp. 380-387
Stable URL: http://www.jstor.org/stable/40300947
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Two New Species of Orchidaceae from Brazil: Bulbophyllum carassense and Lepanthopsis vellozicola
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Abstract

Two new species of Orchidaceae from the Serra do Caraça, state of Minas Gerais, Brazil, are described and illustrated. Bulbophyllum carassense R. C. Mota, F. Barros & Stehmann is endemic to the Serra do Caraça and is epiphytic on trees or sometimes rupicolous. It is related to B. bidentatum (Barbosa Rodrigues) Cogniaux, B. filifolium Borba & Smidt, and B. plumosum (Barbosa Rodrigues) Cogniaux, all belonging to section Xiphizusa (Reichenbach f.) Cogniaux. A table comparing diagnostic characters for B. carassense with morphologically related species is presented. The second new species is Lepanthopsis vellozicola R. C. Mota, F. Barros & Stehmann, which is also rare and endemic to this region as an epiphyte on Vellozia compacta Martius, in campos rupestres vegetation. This is the only species in Lepanthopsis (Cogniaux) Ames with the following combination of characters: the secondary stems show only two evident internodes and are subtended by two leaf sheaths with smooth margins, and the lateral sepals are completely connate. A taxonomic key to identify the Brazilian species of Lepanthopsis is presented. /// Duas novas espécies de Orchidaceae, ambas procedentes da Serra do Caraça, Minas Gerais, Brasil, são descritas e ilustradas. Bulbophyllum carassense R. C. Mota, F. Barros & Stehmann é rara e endêmica da Serra do Caraça e do seu entorno, epífita e ocasionalmente rupícola. Tern afinidade com B. bidentatum (Barbosa Rodrigues) Cogniaux, B. filifolium Borba & Smidt e B. plumosum (Barbosa Rodrigues) Cogniaux, todas da seção Xiphizusa (Reichenbach f.) Cogniaux. É apresentada uma tabela comparativa dos caracteres morfológicos de B. carassense e suas espécies relacionadas. A segunda espécie é Lepanthopsis vellozicola R. C. Mota, F. Barros & Stehmann, também rara e endêmica da Serra do Caraça, crescendo exclusivamente como epífita sobre Vellozia compacta Martius, na vegetação de campo rupestre. É a única espécie do gênero a apresentar as seguintes características: caule secundário com dois entrenós evidentes, associados a duas bainhas foliares com margens lisas, e sépalas laterais totalmente conadas. É apresentada uma chave taxonômica artificial para identificação das espécies de Lepanthopsis (Cogniaux) Ames ocorrentes no Brasil.

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