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Título: A new species of Cryptonemia from Brazil
Autor(es): Joventino, Francisca Pinheiro
Oliveira Filho, Eurico Cabral de
Palavras-chave: Alga - Brasil
Data do documento: 1977
Editor: Arquivos de Ciências do Mar
Resumo: The opportunity to examine a collection of depth plants from some places on the Brazilian littoral brought us in contact with a very interesting species of Cryptonemia that we suppose to be a new one. Though poorly known, the Brazilian sub littoral seems to have a very rich and diversified flora promising to be a good source of interesting and unknown material. Cryptonemia jlabellifolia Pinheiro-Joventino & Oliveira Filho sp. nov. Plantae usque ad 45 cm altae, caulescentes, stipite partibus nudis longis praedito. Stipe in laminas excurrens ad médium et nervum centrale formans simplicem rariusve bitrifurcatum. Laminae cuneatae, apicen versus ampliatae, usque ad 7 cm latae, margine integrae juventute et dentatae provectiore aetate. Thallus corapositus ex 1-2 stratis cellularum corticalium perminutis, 2 stratis cellularum subcorticalium et medulla filamentis laxis; thallo 105-150 um crasso prope nervum. Tetrasporangia ex excrescentiis parviusculis marginalíbus structa. Plantae masculae et femineae desunt. Holotypus - specimen ad 40 cm in fundo maris collectum, Acaraú, Ceará, Brasil, a F. Pinheiro-Joventino lectum. Plants solitary, growing attached to crustaceans Corallinaceae by a disc-like base; the largest specimen measuring up to 45 cm high. The plants are caulescents with a stipe l cm long in old specimens, measuring up to 3 mm in diameter near the base. The branching is regularly alternate, distichous, except for one or other branch that arises from the midrib of the blade. The blades are firm but rather thin and transparent; in old specimens they are flabellate, cuneate at the base and expanding above up to 7 cm wide. The stipes are terete below, becoming flattened and alate above; they continue through the blades for a variable extension as a midrib, but do not reach the tips; in well developed blades the midrib divides in 2-3 branches and the blade becomes cleft, subpalmate. Young blades can be found arising directly from old stipes; they are more or less spatulated or rounded without midribs and very delicate. The blade's mar-gins are plane or slightly undulate, with portions entire or dentate through very small terete teeth; in some blades tiny leaflets proliferations are very abundant, usually fan-shaped and sometimes divided. These proliferations are also abundant in parts where the blade was damaged.
Descrição: JOVENTINO, Francisca Pinheiro; OLIVEIRA FILHO, Eurico Cabral de. A new species of Cryptonemia from Brazil. Arquivos de Ciências do Mar. Fortaleza, v. 17, n.1, p. 49-51, jun. 1977.
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