Osmunda claytoniana


Sp. Pl. 2: 1066. 1753.

Common names: Interrupted fern osmonde de clayton
Treatment appears in FNA Volume 2.

Leaves pinnate-pinnatifid; petioles ca. 1/3 length of blades, winged, with light brown hairs, becoming glabrate. Sterile leaves elliptic to oblong, ca. 0.5–1 m; pinnae broadly oblong, lacking persistent tuft of hairs at base; ultimate segments with base truncate, margins entire, apex rounded. Fertile leaves with greatly reduced, sporangia-bearing medial pinnae that wither early, giving appearance of no middle pinnae (hence the vernacular name, interrupted fern). Sporangia greenish, turning dark brown. 2n =44.

Phenology: Sporulation early spring–midsummer.
Habitat: 0–2300 m


V2 776-distribution-map.gif

St. Pierre and Miquelon, Man., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Conn., Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis., Asia


Osmunda claytoniana is sparingly cultivated as an ornamental.

Selected References


Lower Taxa

... more about "Osmunda claytoniana"
R. David Whetstone +  and T. A. Atkinson +
Linnaeus +
Interrupted fern +  and osmonde de clayton +
St. Pierre and Miquelon +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, W.Va. +, Wis. +  and Asia +
0–2300 m +
Sporulation early spring–midsummer. +
Illustrated +
Osmunda claytoniana +
species +