Novedades en Jamesonia Hook. & Grev.y Tryonia Schuettp., J. Prado & A.T. Cochran (Pteridaceae) para el Neotrópico
Fecha
2017-12
Autores
Rojas Alvarado, Alexander
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Editor
Universidad Nacional (Costa Rica)
Resumen
Tres especies nuevas de Jamesonia Hook. & Grev. parael Neotrópico son descritas aquí: J. erecta A. Rojas, J. panamensis A. Rojas y J. retroflexa A. Rojas. La primera especie se caracteriza por rizoma robusto y ascendente; frondas cortas y ascendentes; lámina estrecha; rachis recto a levemente flexuoso, lámina adaxialmente glabra y abaxialmente con pelos glandulares. La segunda especie tiene distintivamente estípite atropurpúreo a negro, lustroso y glabro; lámina 1-pinnada-pinnatifida o hasta 2-pinadas basalmente, con base truncada; segmentos terminales con dientes agudos, pelos sobre la superficie abaxial rígidos e hialinos, y distribuidos a 1850-2200 m. La tercera especie es reconocida por la lámina oblonga; rachis pardo y flexuoso; pinnas ascendentes; pínnulas retroflexas; segmentos apicales que terminan en particiones ampliamente dicotómicas; venas terminado en puntas oscuras y distribuidas a mayor altitud (3500 m). En el género Tryonia Schuettp., J. Prado & A.T. Cochran se describe a T. macrophylla A. Rojas, y difiere de T. myriophylla (Sw.) Schuettp., J. Prado & A.T. Cochran. por rizoma y base del estípite escamosos; estípite y raquis pardo-rojizo; frondas largas (150-200 cm), conocidas de Colombia y distribuidas a mayor distribución altitudinal (2450-2740 m). Seguidamente se combina a Gymnogrammaglandulifera Hieron. bajo el género Jamesonia y se registra para Costa Rica y Mesoamérica a Jamesonia rufescens (Fée) Christenh.
Novelties in Jamesonia Hook. & Grev. and Tryonia Schuettp., J. Prado & A.T. Cochran (Pteridaceae) from the Neotropics. Five new species of Jamesonia Hook. & Grev. from the Neotropics are described here: J. erecta A. Rojas, J. panamensis A. Rojas and J. retroflexa A. Rojas. The first species is characterized by robust and ascendent rhizome; fronds short ascendent; blade narrow; rachis straight to slightly flexuous, blade adaxialy glabrous and abaxially with glandular hairs. The second species distinctively has stipe atropurpureous to black, lustrous and glabrous; blade 1-pinnate-pinnatifid or until 2-pinnate basally, with base truncate; ending segments with acute teeth, hairs on abaxial surface rigid and hyaline, and distributed at 1850–2200 m. The third species is recognized by blade oblong; rachis brown and flexuous; pinnae ascendent; pinnules retroflexed; terminal segments ending in broadly dichotomous partitions; veins ending in dark tips and distributed at high altitudinal distribution (3500 m). In the Tryonia Schuettp., J. Prado & A.T. Cochran genus T. macrophylla A. Rojas is described, and differs from T. myriophylla (Sw.) Schuettp., J. Prado & A.T. Cochran. by its rhizome and stipe base scaly; stipe and rachis reddish-brown; fronds long (150–200 cm), known from Colombia and distributed at high altitudinal elevation (2450–2740 m). After that, Gymnogrammaglandulifera Hieron. is combined and Jamesonia rufescens (Fée) Christenh. is registered from Costa Rica and Mesoamerica.
Novelties in Jamesonia Hook. & Grev. and Tryonia Schuettp., J. Prado & A.T. Cochran (Pteridaceae) from the Neotropics. Five new species of Jamesonia Hook. & Grev. from the Neotropics are described here: J. erecta A. Rojas, J. panamensis A. Rojas and J. retroflexa A. Rojas. The first species is characterized by robust and ascendent rhizome; fronds short ascendent; blade narrow; rachis straight to slightly flexuous, blade adaxialy glabrous and abaxially with glandular hairs. The second species distinctively has stipe atropurpureous to black, lustrous and glabrous; blade 1-pinnate-pinnatifid or until 2-pinnate basally, with base truncate; ending segments with acute teeth, hairs on abaxial surface rigid and hyaline, and distributed at 1850–2200 m. The third species is recognized by blade oblong; rachis brown and flexuous; pinnae ascendent; pinnules retroflexed; terminal segments ending in broadly dichotomous partitions; veins ending in dark tips and distributed at high altitudinal distribution (3500 m). In the Tryonia Schuettp., J. Prado & A.T. Cochran genus T. macrophylla A. Rojas is described, and differs from T. myriophylla (Sw.) Schuettp., J. Prado & A.T. Cochran. by its rhizome and stipe base scaly; stipe and rachis reddish-brown; fronds long (150–200 cm), known from Colombia and distributed at high altitudinal elevation (2450–2740 m). After that, Gymnogrammaglandulifera Hieron. is combined and Jamesonia rufescens (Fée) Christenh. is registered from Costa Rica and Mesoamerica.
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ERIOSORUS, HELECHOS, NUEVAS ESPECIES, NUEVOS TAXONES, POLYPODIALES, PTERIDOPHYTA, COLOMBIA, FERNS, NEW SPECIES