Dryopteris rossii C.Chr.
Descripción
Rhizomes short-creeping; rhizome scales concolorous, blackish brown, lustrous, 2.5–5 X 1–2 mm, ovate, margins entire or with minute glands; fronds 20–80 cm long; stipes stramineous to castaneous proximally, 10–33 cm X 1–3(–4) mm, 1⁄3–1⁄2 the frond length, densely glandular, bases scaly, with entire scales 5–6(–10) X 1–2 mm, at least some scales bicolorous with lustrous dark tips and pale brown bases; blades chartaceous, green, deltate, 2–3-pinnate-pinnatifid at bases, otherwise mostly 2-pinnatepinnatifid, 25–44 X (8–)18–30 cm, with pinnae mostly alternate, ascending 50–65° from rachises, 10–15 pairs; rachises stramineous, with sparse, pale scales, also densely glandular; proximal pinnae ± equilateral to usually a little inequilateral, 8–20(–25) X 4–7(–10) cm, with larger basiscopic basal pinnule 3–5.5 cm long, acroscopic basal pinnule 2–3(–5) cm long; distal pinnae stalked to 8 mm, equilateral or often slightly more developed acroscopically, pinnules and ultimate segments toothed; indument abaxially of stipitate glands on costae, veins, and surfaces between veins, also with sparse, hair-like scales 0.5–1 mm long on costae, adaxially glabrous or the lamina quite glandular; sori submarginal, indusia brown to tan, 0.5–0.8(–1) mm diam., flat, glandular; 2n=82 (Edo. Méx., reported as D. patula by Mickel et al., 1966).A
Forma de vida
TerrestreA
Ejemplar revisado
Ags (McVaugh & Koelz 214, MICH). BCS (Carter 2368 et al., UC). Col (Alava & Cook 1709, UC). Dgo (Sánchez 743, MEXU). Gro (Hinton 9344, LL, NY, US). Gto (Flores 135, IEB, MEXU). Jal (Pringle 1839, UC). Méx (Bartholomew 2905 et al., CAS, UC). Mich (Pringle 3362, CAS, MEXU, NY, UC, US). Mor (Pringle 15710, ASU, CAS, LL, MO, UC, US). Nay (Alava & Cook 1624, UC). Oax (Mickel 6973, NY). Sin (Mexia 463, UC). Zac (Calzada 13398, UC).
Unverified, Doubtful, or Mistaken Reports. DF (reported by Mickel & Beitel, 1988, but not verified). Qro (Carranza 1275, IEB, QMEX, cited by Díaz-Barriga & Palacios-Rios, 1992, and by Arreguín et al., 2001, but this specimen is D. cinnamomea).
A
Unverified, Doubtful, or Mistaken Reports. DF (reported by Mickel & Beitel, 1988, but not verified). Qro (Carranza 1275, IEB, QMEX, cited by Díaz-Barriga & Palacios-Rios, 1992, and by Arreguín et al., 2001, but this specimen is D. cinnamomea).
A
Distribución
México (país) EndémicoA
Elevación
(500 –)900 – 2600 mA
Ecología y Hábitat
Especially along streams.A
Tipo de vegetación
Bosque de pino-encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This distinctive species in the D. patula complex is common in western and central Mexico, but rare or absent elsewhere. It can be distinguished by its broadly deltate blades, generally longer-stalked pinnae, dark brown or blackish, lustrous, relatively small rhizome scales, and strongly bicolorous stipe scales with tan bases and black tips. The closest relative is D. knoblochii, which differs in the concolorous tan stipe base scales.A