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FNA | Family List | FNA Vol. 28 | Helodiaceae | Elodium

3. Elodium paludosum Austin, Musci Appalach. 306. 1870.

Helodium paludosum (Austin) Brotherus; Thuidium paludosum (Austin) Rau & Hervey

Plants medium-sized, in delicate mats, pale green or yellow-green. Stems green, spreading, loosely

1-subpinnate, branches unequal, flexuose; central strand present; paraphyllia many, loosely felted on stems and branches, to 10 or 11 cells in length. Stem and branch leaves distant, wide-spreading when moist, ovate-lanceolate, striate-plicate, stem leaves 1.5-1.8 mm, branch leaves 0.9-1.5 mm; margins plane in acumen, nearly entire proximally, minutely serrulate or sinuate-serrulate distally; apex gradually long-acuminate, acumen slender, flat; costa ending in acumen near apex to subpercurrent, proximal abaxial surface smooth; stem leaf laminal cells long-rectangular to linear, corners angular, abaxial surface smooth or weakly papillose-prorulose because of projecting distal ends of lumen, walls thin, especially in margins. Perichaetia with leaf margins regularly denticulate distally. Seta 2-2.8 cm. Capsule 2-2.5 mm.

Capsules mature spring. Hydric soil of fens, marshes, hummocks in swamps, logs, base and roots of Alnus, seepages, depressions in wet woods and thickets, grassy wet meadows and bottomlands, wet tree bases, Taxodium distichum swamps in southern areas, near springs, dry soil, seasonally submerged, seasonally wet areas, dry sinkhole ponds, top of hills and mountains in brushy marshes; low to moderate elevations; B.C., N.S., Ont., Que.; Ala., Alaska, Conn., Del., Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.; e Asia.

Elodium paludosum tolerates drier situations than E. blandowii. The leaves are more distant on the stem (especially notable when dry). Although the leaves of E. blandowii are strongly, and E. elodioides moderately, catenulate when dry, those of E. paludosum are straight and wide-spreading.


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