Pellaea atropurpurea

(Linnaeus) Link

Fil. Spec. 59. 1841.

Common names: Pelléade à stipe pourpre
Illustrated
Basionym: Pteris atropurpurea Linnaeus Sp. Pl. 2: 1076. 1753
Synonyms: Pellaea atropurpurea var. cristata Trelease
Treatment appears in FNA Volume 2.

Stems compact, ascending, stout, 5–10 mm diam.; scales uniformly reddish-brown (or tan), linear-subulate, 0.1–0.3 mm wide, thin, margins entire to denticulate. Leaves somewhat dimorphic, sterile leaves shorter and less divided than fertile leaves, clustered on stems, 5–50 cm; croziers villous. Petiole reddish purple to nearly black, lustrous, rounded adaxially, without prominent articulation lines. Blade elongate-deltate, usually 2-pinnate proximally, 2–18 cm wide; rachis reddish purple throughout, straight, rounded adaxially, densely pubescent adaxially with short, curly, appressed hairs. Pinnae perpendicular to rachis or ascending, not decurrent on rachis, usually with 3–15 ultimate segments; costae straight, 10–100 mm, often longer than ultimate segments. Ultimate segments linear-oblong, 10–75 mm, leathery, sparsely villous abaxially near midrib; margins weakly recurved to plane on fertile segments, usually covering less than 1/2 abaxial surface, borders whitish, crenulate; apex obtuse to slightly mucronate. Veins of ultimate segments obscure. Sporangia long-stalked, containing 32 spores, not intermixed with farina-producing glands. n = 2n = 87, apogamous.


Phenology: Sporulating summer–fall.
Habitat: Calcareous cliffs and rocky slopes, usually on limestone
Elevation: 100–2500 m

Distribution

V2 432-distribution-map.gif

Ont., Que., Ala., Ariz., Ark., Colo., Conn., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Mass., Mich., Minn., Miss., Mo., Nebr., Nev., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., W.Va., Wis., Wyo., Mexico, Central America in Guatemala

Discussion

Contrary to D. B. Lellinger's (1985) hypothesis, isozyme data indicate that neither Pellaea glabella nor P. ternifolia was involved in the origin of this apogamous triploid. Instead, it appears that P. atropurpurea is an autopolyploid derivative of a single diploid taxon that has not yet been located. A thorough survey of spore number per sporangium in this species should be undertaken to determine whether the diploid progenitor is still extant. Collections from western Canada identified as P. atropurpurea actually represent P. gastonyi, an apogamous tetraploid produced by hybridization between P. atropurpurea and diploid populations of P. glabella. Pellaea atropurpurea has also hybridized with P. wrightiana; the hybrid is a rare apogamous pentaploid known only from western Oklahoma. Pellaea lyngholmii is the apogamous tetraploid hybrid between P. atropurpurea and P. truncata. Pellaea atropurpurea is distinguished from all these hybrids by having rachises that are densely pubescent adaxially, larger ultimate segments, and spores averaging less than 62 µm in diameter.

Selected References

None.

Lower Taxa

None.
... more about "Pellaea atropurpurea"
Michael D. Windham +
(Linnaeus) Link +
cordate +, truncate +  and rounded +
Pteris atropurpurea +
glabrous +  and pubescent +
elongate-deltate +
2cm;18cm +
crenulate +
Pelléade à stipe pourpre +
straight +
Ont. +, Que. +, Ala. +, Ariz. +, Ark. +, Colo. +, Conn. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, Nev. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, W.Va. +, Wis. +, Wyo. +, Mexico +  and Central America in Guatemala +
100–2500 m +
yellow +  and white +
obcordate;reniform +
Calcareous cliffs and rocky slopes, usually on limestone +
monomorphic +
clustered;widely scattered +
recurved +  and reflexed +
fertile +  and sterile +
divided +
noncircinate +  and circinate +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +
entire +, erose +  and dentate +
plane +, entire +  and denticulate +
reddish purple;nearly black +
pubescent +  and glabrous +
Sporulating summer–fall. +
perpendicular +
reddish purple +
not decurrent +  and rounded +
reddish-brown +
persistent +
linear-subulate +
thin +, 0.1mm +  and 0.3mm +
Illustrated +
brown +  and tan +
cristate +  and tetrahedral-globose +
dark colored +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Pellaea atropurpurea var. cristata +
Pellaea atropurpurea +
species +
1 cm10 mm <br />0.01 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
crescent--shaped +  and roundish +
branched +  and anastomosing +