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Published In: Bulletin of the Torrey Botanical Club 20: 117. 1893. (Bull. Torrey Bot. Club) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 3/22/2011)
Acceptance : Accepted
Project data     (Last Modified On 3/23/2011)
Discussion: This species is recognized by its dioicous condition and rectangular to linear leaf cells. Central American material has longer leaf cells and more stiffly erect leaves than is typical for the species in North America; Crum and Anderson (1981) considered the Guatemalan material misnamed. All Central American material has the long, spiculose, obliquely twisted "tortuloid" peristome teeth that mark this species.
Illustrations: Bartram (1949, Fig. 14 A–D); Grout (1936, Pl. 29 B–C); Lawton (1971, Pl. 15 1–8); Crum and Anderson (1981, Fig. 53 I–O).
Habitat: On bank of bare soil; 1800–1900 m.
Distribution in Central America:

GUATEMALA. Sacatepéquez: Standley 60245 (FH). PANAMA. Chiriquí: Davidse & D'Arcy 10330 I (MO).

World Range: Western Canada, Northeastern, Southeastern, Northwestern and Southwestern U.S.A.; Central America; Indian Subcontinent.


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Ditrichum ambiguum Best, Bull. Torrey Bot. Club 20: 117. 1893. Type. U.S.A., Washington, Mason County, Piper s.n.

Plants small, 3–15 mm high, dull green to yellowish. Leaves 2.0–2.5 mm long, erect to erect-flexuous, with spreading points, ovate-lanceolate to lanceolate, subulate-acuminate; margins narrowly recurved, entire below, serrulate at apex; costa percurrent; cells firm-walled to incrassate; lower cells long-rectangular, 25–27 µm long; upper cells short-rectangular, 15–17 µm long. Dioicous. Setae 8–9 mm long, red; capsules erect, cylindric, 1.8–2.0 mm long; opercula high-conic, blunt; peristome teeth 500–800 µm, split nearly to the base into 2 terete, filiform, red, densely spiculose, obliquely twisted divisions. Spores 12–13 µm, smooth.


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