Thelypteris palustris var. pubescens

(Lawson) Fernald

Rhodora 31: 34. 1929.

Basionym: Lastrea thelypteris var. pubescens Lawson Edinburgh New Philos. J., n.s. 19: 277. 1864
Synonyms: Dryopteris thelypteris var. pubescens (Lawson) Weatherby Thelypteris palustris var. haleana Fernald
Treatment appears in FNA Volume 2.

Stems long-creeping, 1–3 mm diam. Leaves monomorphic or slightly dimorphic, dying back in winter, often 1–3 cm apart, fertile leaves more erect, narrower, and with somewhat contracted pinnae and segments, 20–90 cm. Petiole straw-colored above base, 9–45(–60) cm × 1–3 mm, at base sparsely set with tan, ovate, glabrous scales. Blade lanceolate, 10–40(–55) cm, proximal pinnae commonly slightly shorter, blade tapering gradually to pinnatifid apex. Pinnae pinnatifid to within 1 mm of costa, 2–10 × 0.5–2 cm; segments oblong, somewhat oblique, entire; proximal pair of veins from adjacent segments meeting margin above sinus, veins frequently forked. Indument abaxially of sparsely to densely set hairs on costae and sometimes veins, costae also commonly with a few small, tan scales, blade tissue glabrous on both sides. Sori round, medial; indusia tan, often hairy; sporangia glabrous. 2n = 70.

Habitat: Terrestrial in swamps, bogs, and marshes, also along riverbanks and roadside ditches, and in wet woods
Elevation: 0–1000 m


V2 488-distribution-map.gif

St. Pierre and Miquelon, Man., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., perhaps Mexico (as Dryopteris tremula H. Christ), West Indies in Bermuda, Cuba.


Selected References


Lower Taxa

Alan R. Smith +
(Lawson) Fernald +
Lastrea thelypteris var. pubescens +
St. Pierre and Miquelon +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Vt. +, Va. +, W.Va. +, Wis. +, perhaps Mexico (as Dryopteris tremula H. Christ) +, West Indies in Bermuda +  and Cuba. +
0–1000 m +
Terrestrial in swamps, bogs, and marshes, also along riverbanks and roadside ditches, and in wet woods +
Dryopteris thelypteris var. pubescens +  and Thelypteris palustris var. haleana +
Thelypteris palustris var. pubescens +
Thelypteris palustris +
variety +