Rhytidiadelphus triquetrus

(Hedwig) Warnstorf
Krypt.-Fl. Brandenburg 2: 920. 1906.
Illustrated
Basionym: Hypnum triquetrum Hedwig Sp. Musc. Frond., 256. 1801
Synonyms: Rhytidiadelphus triquetrus var. beringianus (Cardot & Thériot) Grout
Treatment appears in FNA Volume 28. Treatment on page 331. Mentioned on page 325.
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Plants to 20 cm, coarse. Stems 3–8 mm wide across leafy stem, irregularly to unevenly pinnate, branches to 2.5 cm. Stem leaves wide-spreading, heteromallous, crowded at stem apices, ovate-triangular, plicate, rugose, 3.2–4.9 × 1.6–2.5 mm; base cordate-clasping, broadly rounded to insertion; apex gradually narrowed, acumen broad, flat (occasionally rugose); costa 1/2–2/3 leaf length; alar cells slightly differentiated; medial laminal cells 30–55 × 5–9 µm, coarsely prorate. Branch leaves ovate to lanceolate, 1.8–3.1 × 0.7–1.6 mm. Capsule oblong-cylindric, 1.8–3.5 mm.


Habitat: Soil, humus, less often on logs and rock, forests from dry-mesic oak/hickory to wet Thuja swamps, most common in northern coniferous forests
Elevation: low to high elevations (0-2000 m)

Distribution

V28 515-distribution-map.gif

Greenland, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska, Ariz., Ark., Calif., Colo., Conn., Idaho, Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mo., Mont., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., S.Dak., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo., Eurasia, Pacific Islands (New Zealand).

Discussion

A specimen of Rhytidiadelphus triquetrus from Florida in the Torrey Herbarium (NY) is correctly identified, but the locality is very unlikely. The branches of R. triquetrus are often arcuate-decurved.

Selected References

None.

Lower Taxa

None.

Joseph R. Rohrer +
(Hedwig) Warnstorf +
Hypnum triquetrum +
Greenland +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Idaho +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +, Eurasia +  and Pacific Islands (New Zealand). +
low to high elevations (0-2000 m) +
Soil, humus, less often on logs and rock, forests from dry-mesic oak/hickory to wet Thuja swamps, most common in northern coniferous forests +
Krypt.-Fl. Brandenburg +
Illustrated +
Rhytidiadelphus triquetrus var. beringianus +
Rhytidiadelphus triquetrus +
Rhytidiadelphus +
species +