Trematodon ambiguus

(Hedwig) Hornschuch

Flora 2: 88. 1819,.

Basionym: Dicranum ambiguum Hedwig Sp. Musc. Frond., 150. 1801
Synonyms: Trematodon acicularis Kindberg
Treatment appears in FNA Volume 27. Treatment on page 439. Mentioned on page 437.
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Leaves ovate-lanceolate to short-subulate from an ovate or obovate base, serrulate at apex; costa excurrent or at least filling the leaf apex. Seta long, 10–30 mm. Capsule inclined, curved; neck as long as urn, long-cylindric, strumose at base; peristome teeth 2-fid or long-perforate, not fragile, commonly persistent; annulus compound, revoluble.

Phenology: Capsules mature late summer–fall.
Habitat: Soil, humus
Elevation: low to moderate, rarely high elevations


Greenland, B.C., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Alaska, Maine, Md., Mass., Mich., Minn., N.H., N.Y., Pa., Vt., Va., Wis., Central America, Europe, Asia (China, Japan).


The urn and capsule neck of Trematodon ambiguus and of T. longicollis are the same length in moist material, but the spore sac is relatively small in T. longicollis. The base of the urn collapses in dried specimens of the latter species, making its neck appear 2(–3) times as long as the urn.

Selected References


Lower Taxa

... more about "Trematodon ambiguus"
Richard H. Zander +
(Hedwig) Hornschuch +
Dicranum ambiguum +
Greenland +, B.C. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Alaska +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.Y. +, Pa. +, Vt. +, Va. +, Wis. +, Central America +, Europe +, Asia (China +  and Japan). +
low to moderate, rarely high elevations +
Soil, humus +
Capsules mature late summer–fall. +
Trematodon acicularis +
Trematodon ambiguus +
Trematodon +
species +