Dryopteris maxonii Underw. & C.Chr.
Descripción
Rhizomes suberect; rhizome scales bicolorous, light brown with dark brown to black central streak, 5–8 X 2–3 mm, ovatelanceolate, entire; fronds (25–)40–80 cm long; stipes stramineous, 12–32 cm X (1–)2–5 mm, 1⁄4–1⁄2 the frond length, bases with entire scales, lacking scales distally, eglandular; blades herbaceous to chartaceous, green, ovate-lanceolate to deltate, generally 2-pinnate-pinnatifid, 19–40(–60) X (4–)8–26 cm, with pinnae mostly alternate, spreading or only slightly ascending, 13–20 pairs; rachises stramineous, with scattered, tan lanceolate twisted scales 1–3 X 0.1–0.4 mm, scales irregular toothed or ciliate, glands absent; proximal pinnae inequilateral, more developed basiscopically, (4–)6–25 X (1.7–)2.5–10 cm, slightly shorter than or nearly equalling the second pinna pair, basiscopic basal pinnule to 4.5 cm long, shorter that the next pinnule (to 6 cm), acroscopic basal pinnule to 3.5 cm long; distal pinnae sessile or stalked to 5 mm, ± equilateral, pinnules deeply lobed to toothed; indument abaxially of scattered, tan scales to 3 X 0.4 mm on costae and costules, glands essentially absent, adaxially the blades glabrous; sori medial, indusia brown, 1.2–1.5 mm diam., vaulted, glabrous; 2n=82 (Jal).A
Forma de vida
TerrestreA
Ejemplar revisado
Col (Orcutt 4700, DS, NY, TEX, US). DF (Meave 478, MEXU). Dgo (Ortega 4289, US). Gro (Hinton 9445, NY, TEX, US). Gto (Rzedowski 51756, IEB). Jal (Cutler 4073, UC). Méx (Hinton 4703, NY). Mich (Pringle 8846, CAS, TEX, UC, US). Mor (Pringle 15718, ARIZ, ASU, CAS, LL, TEX, UC, US). Nay (Solórzano Vargas 16916, UC). Pue (Nicolas s.n., UC). Sin (Breedlove 18135, CAS, NY).A
Distribución
México (país) EndémicoA
Elevación
(300 –)1100 – 2300 mA
Ecología y Hábitat
Shaded banks and rocks in humid or moderately dry.A
Tipo de vegetación
Bosque de encino, Bosque de pino-encino, Selva medianaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Dryopteris maxonii differs from congeners in Mexico by its vaulted, firm, glabrous indusia, essentially glandless blades, and stramineous stipe bases with light tan scales.
Hinton 7316 (LL, TEX, US), 16040 (NY, UC, US), and 16155 (ENCB, LL, UC, US) were all collected in Edo. Michoacán, Dto. Coalcoman, Aquila, 300 m. The first of these three collections was determined as “D. micradenia Weath., n. sp. ined.,” at GH. These collections differ from other specimens of the species by their smaller size and more dentate pinnules, and were collected at much lower elevation than usual for the species.
A
Hinton 7316 (LL, TEX, US), 16040 (NY, UC, US), and 16155 (ENCB, LL, UC, US) were all collected in Edo. Michoacán, Dto. Coalcoman, Aquila, 300 m. The first of these three collections was determined as “D. micradenia Weath., n. sp. ined.,” at GH. These collections differ from other specimens of the species by their smaller size and more dentate pinnules, and were collected at much lower elevation than usual for the species.
A