Cheilanthes lozanoi (Maxon) R.M.Tryon & A.F.Tryon
Descripción
Rhizomes short, compact, horizontal, 2–4 mm diam.; rhizome scales linear, 4–5 mm long, bicolorous, thickened, sclerotic, center reddish brown to black, margins thin, tan, erose-denticulate; fronds to 36 cm long, clumped; stipes ca. 1⁄3 the frond length, dull gray to grayish brown, plane adaxially with slight wings making shallow grooves in distal stipes and rachises, with scattered to dense hairs 2 mm long and linear scales; blades narrowly oblong, pinnate to bipinnate-pinnatifid, segments deltateacuminate to acute; laminae chartaceous, veins evident to obscure; adaxial surfaces glabrous or with scattered short, white, jointed hairs 0.1 mm or less long; abaxial surfaces with scattered to dense, white hairs 0.5–1 mm long, and narrow, pale brown to white, hair-like scales; sori marginal, elongate along vein tips, laminar margins slightly curved and only somewhat modified as false indusia 0.1–0.3 mm wide, margins entire; spores tan.A
Forma de vida
Epipétrica, TerrestreA
Distribución
México (país) EndémicoA
Elevación
0 – 1900 mA
Ecología y Hábitat
On dry banks and slopes.A
Tipo de vegetación
Matorral espinoso, Selva baja, Matorral rosetófiloB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Cheilanthes lozanoi is most closely related to C. skinneri as evidenced by the linear, bicolorous rhizome scales, chartaceous blade texture, evident veins, dull stipes and rachises, and similar scales and hairs on rachises.
Key to the Mexican Varieties of Cheilanthes lozanoi
Blades pinnate to pinnate-pinnatifid, with 0–4 pairs of lobes with at most a single basal pair of free pinnules, terminal pinna segment distinctly larger than other pinna segments, triangular; low to middle elevations: 0–125(1900) m)................................................................................................................. var. lozanoi.
Blades pinnate-pinnatifid to bipinnate (to rarely tripinnate at base); proximal 2–7 pinna pairs pinnate with 2–4 basal pairs of free pinnules, terminal pinna segment pinnatifid, similar to other segments; middle elevations: (1050–)1450-1700 m.................................................................var. seemannii.
Cheilanthes lozanoi var. lozanoi (Maxon) R.M.Tryon & A.F.Tryon, Rhodora 83: 133. 1981
Pinnae entire or with 1–2 pairs of lobes or single pair of basal free pinnules, terminal pinna segment triangular, distinctly larger than other pinna segments.
Distribution. Dry, rocky roadbanks, streambanks, and shrubby slopes; 0–1250(–1900) m. Mexico.
Selected Specimens Examined. Chis (Purpus 6728, NY). Col (Morgan s.n., 18 Jan 1989, NY). DF (Rusby 368, NY). Dgo (Gentry 8308, UC). Gro (Hinton 9170, NY). Jal (Lott 540, NY). Méx (Hinton 4318, LL, NY). Mich (McVaugh 17985, NY). Nay (Rodin 7015, NY). Oax (Mickel 5188, NY). Sin (Fryxell 3052, MEXU).
Cheilanthes lozanoi var. lozanoi is highly variable, and the limits of the varieties are not clearly defined.
Cheilanthes lozanoi var. seemannii (Hook.) Mickel & Beitel, Mem. New York Bot. Gard. 46: 118. 1988
Pellaea seemannii Hook., Sp. Fil. [W. J. Hooker] 2: 141, t.117B. 1858
Similar to C. lozanoi var. lozanoi except: basal 2–7 pinnae pinnate with 2–4 basal pairs of free pinnules, pinnae each with pinnatifid terminal segment, similar to other segments; adaxial surfaces with scattered to dense white hairs and hair-like scales; 2n=60 (Son).
Distribution. Dry, rocky slopes, dry arroyos with cactus-acacia association, and dry thorn-scrub with a few oaks; (1050–)1450– 1700 m. Mexico.
Selected Specimens Examined. BCS (Brandegee 663, NY). Chih (Palmer 69, NY, US). Dgo (Worthington 8975, NY). Gro (Martínez S. 1160, MEXU). Gto (Galván 2408B, ENCB). Jal (Palmer 300, NY). Méx (Tejero-Díez 3061, IZTA). Mich (Hinton 12077, NY). Mor (Rose 6864, NY). Oax (Mickel 6646, NY). Pue (Miranda s.n., Aug 1943, MEXU). Qro (Rose 9506, NY). SLP (Fisher s.n., 23 Aug 1937, NY). Sin (Fryxell 3052, NY). Son (Gentry et al. 19288, NY). Tam (Viereck 640, US). Tres Marías (Ferris 5706, DS).
Unverified, Doubtful, or Mistaken Reports. Ags (Siqueiros 1564, HUAA, and five other collections, cited by Siqueiros-Delgado & González-Adame, 2004, but not verified). Chis (Breedlove 36811, DS, 417971, CAS; Purpus 6728, UC, US, all cited by Smith, 1981, but treated here under var. lozanoi).
Var. seemannii is the more common and widespread variety. Specimens from northwestern Mexico, especially the states of Baja California Sur, Sonora, and Sinaloa, have more remote and more pointed free segments. This seems to include the type of var. seemannii. The element with rounder segments may represent a distinct taxon.
The two varieties of C. lozanoi need more study to determine if variation seen throughout Mexico (see key and descriptions) represents two or three species with hybrid intermediates, clinal variation in a single species, or one highly variable species (C. lozanoi). In this treatment, the elements are accepted on the varietal level because of the correlation of geographic and elevational separation with blade dissection, which seems to differ only in degree.
A
Key to the Mexican Varieties of Cheilanthes lozanoi
Blades pinnate to pinnate-pinnatifid, with 0–4 pairs of lobes with at most a single basal pair of free pinnules, terminal pinna segment distinctly larger than other pinna segments, triangular; low to middle elevations: 0–125(1900) m)................................................................................................................. var. lozanoi.
Blades pinnate-pinnatifid to bipinnate (to rarely tripinnate at base); proximal 2–7 pinna pairs pinnate with 2–4 basal pairs of free pinnules, terminal pinna segment pinnatifid, similar to other segments; middle elevations: (1050–)1450-1700 m.................................................................var. seemannii.
Cheilanthes lozanoi var. lozanoi (Maxon) R.M.Tryon & A.F.Tryon, Rhodora 83: 133. 1981
Pinnae entire or with 1–2 pairs of lobes or single pair of basal free pinnules, terminal pinna segment triangular, distinctly larger than other pinna segments.
Distribution. Dry, rocky roadbanks, streambanks, and shrubby slopes; 0–1250(–1900) m. Mexico.
Selected Specimens Examined. Chis (Purpus 6728, NY). Col (Morgan s.n., 18 Jan 1989, NY). DF (Rusby 368, NY). Dgo (Gentry 8308, UC). Gro (Hinton 9170, NY). Jal (Lott 540, NY). Méx (Hinton 4318, LL, NY). Mich (McVaugh 17985, NY). Nay (Rodin 7015, NY). Oax (Mickel 5188, NY). Sin (Fryxell 3052, MEXU).
Cheilanthes lozanoi var. lozanoi is highly variable, and the limits of the varieties are not clearly defined.
Cheilanthes lozanoi var. seemannii (Hook.) Mickel & Beitel, Mem. New York Bot. Gard. 46: 118. 1988
Pellaea seemannii Hook., Sp. Fil. [W. J. Hooker] 2: 141, t.117B. 1858
Similar to C. lozanoi var. lozanoi except: basal 2–7 pinnae pinnate with 2–4 basal pairs of free pinnules, pinnae each with pinnatifid terminal segment, similar to other segments; adaxial surfaces with scattered to dense white hairs and hair-like scales; 2n=60 (Son).
Distribution. Dry, rocky slopes, dry arroyos with cactus-acacia association, and dry thorn-scrub with a few oaks; (1050–)1450– 1700 m. Mexico.
Selected Specimens Examined. BCS (Brandegee 663, NY). Chih (Palmer 69, NY, US). Dgo (Worthington 8975, NY). Gro (Martínez S. 1160, MEXU). Gto (Galván 2408B, ENCB). Jal (Palmer 300, NY). Méx (Tejero-Díez 3061, IZTA). Mich (Hinton 12077, NY). Mor (Rose 6864, NY). Oax (Mickel 6646, NY). Pue (Miranda s.n., Aug 1943, MEXU). Qro (Rose 9506, NY). SLP (Fisher s.n., 23 Aug 1937, NY). Sin (Fryxell 3052, NY). Son (Gentry et al. 19288, NY). Tam (Viereck 640, US). Tres Marías (Ferris 5706, DS).
Unverified, Doubtful, or Mistaken Reports. Ags (Siqueiros 1564, HUAA, and five other collections, cited by Siqueiros-Delgado & González-Adame, 2004, but not verified). Chis (Breedlove 36811, DS, 417971, CAS; Purpus 6728, UC, US, all cited by Smith, 1981, but treated here under var. lozanoi).
Var. seemannii is the more common and widespread variety. Specimens from northwestern Mexico, especially the states of Baja California Sur, Sonora, and Sinaloa, have more remote and more pointed free segments. This seems to include the type of var. seemannii. The element with rounder segments may represent a distinct taxon.
The two varieties of C. lozanoi need more study to determine if variation seen throughout Mexico (see key and descriptions) represents two or three species with hybrid intermediates, clinal variation in a single species, or one highly variable species (C. lozanoi). In this treatment, the elements are accepted on the varietal level because of the correlation of geographic and elevational separation with blade dissection, which seems to differ only in degree.
A