Austroblechnum penna-marina (Poir.) Gasper & V.A.O.Dittrich
Descripción
Differs from B. stoloniferum by: fronds (both sterile and fertile) stiffly erect; blades subcoriaceous; sterile pinnae with costae grooved adaxially; fertile pinnae 30+ pairs, inequilateral and surcurrent at bases, arcuate, conduplicate, not apiculate at apices, of relatively uniform length from near blade bases to just short of blade apices.A
Forma de vida
TerrestreA
Ejemplar revisado
(Related to the synonym Blechnum penna-marina) Chih (Correll & Gentry 23093, UC, US). Dgo (Maysilles 7925, NY).A
Elevación
2300 – 2600 mA
Ecología y Hábitat
On seepage slopes along streams.A
Tipo de vegetación
Bosque de pino, Bosque de pino-encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym Blechnum penna-marina) This startling discovery, reported for the first time here, is remarkable for the nearly 4000 mile disjunction between southern Peru and northwestern Mexico. Previously, the specimen from Chihuahua had been regarded by everyone as B. stoloniferum (Knobloch & Correll, 1962; Smith, 1981; Mickel & Beitel, 1988). However, the two Mexican collections cited above differ from that in characteristics mentioned in the diagnosis above. The illustration of B. stoloniferum in Knobloch and Correll (1962: 134) is an excellent depiction of B. penna-marina, showing the numerous, spreading non-apiculate, conduplicate fertile pinnae. The specimens we cite from Durango and from Guatemala are sterile, and so many of the diagnostic characters are not determinable; however, in features of the sterile blades, they appear to be B. penna-marina, not B. stoloniferum. One can only ponder the means by which the Mexican populations became established.A