Pentagramma Yatsk., Windham & E.Wollenw.
Descripción
Rhizomes short-creeping, erect or ascending; rhizome scales bicolorous, each with black, sclerotic central stripe and tan margins, linear-lanceolate, entire; fronds monomorphic, clumped, 5–40 cm long; stipes castaneous to black, terete, glabrous, farinose or viscid-glandular; blades deltate-pentagonal, 1–2-pinnate-pinnatifid proximally, pinnatifid to pinnate-pinnatifid distally, herbaceous to coriaceous, adaxially glabrous or glandular, dull, abaxially farinose, farina white or yellow; ultimate segments sessile, adnate to rachises and costae their full width, deltate to oblong, margins not recurved, not differentiated; veins free, obscure; sporangia borne along veins, containing 64 spores, without indusia; spores tan to brown, tetrahedral; x=30.A
Forma de vida
Rupícola, TerrestreA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Pentagramma is a genus of only two species of western North America and Mexico (one species in northwestern Mexico with three subspecies).
Traditionally, Pentagramma was included in Pityrogramma, based on the farinose fronds and gymnogrammoid sori, but evidence from morphology, cytology, and molecular studies have shown that the two genera are not closely related. Taxa within the genus have been treated variously, and further studies are needed.
A
Traditionally, Pentagramma was included in Pityrogramma, based on the farinose fronds and gymnogrammoid sori, but evidence from morphology, cytology, and molecular studies have shown that the two genera are not closely related. Taxa within the genus have been treated variously, and further studies are needed.
A