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FNA | Family List | FNA Vol. 27 | Polytrichaceae | Polytrichastrum

5a. Polytrichastrum formosum (Hedwig) G. L. Smith var. formosum

Plants medium to large and robust. Stems 5-10(-20) cm. Leaves 6-12 mm, subsquarrose and broadly spreading-recurved when moist; marginal lamina 2-5 cells wide, erect; lamellae 5-7 cells high, entire, the marginal cells rounded and ± thick-walled. Sexual condition dioicous. Capsule short rectangular, yellowish to brownish; hypophysis cylindric, delimited by a shallow groove; peristome teeth 64, very regular in form.

Low to moderate elevations (0-500 m); B.C., N.B., Ont.; Alaska, Wash.; Europe; sw Asia (Caucasus Mountains, s Russia, Turkey); n Africa (Algeria); Atlantic Islands (Iceland, Macaronesia).

Variety formosum is rare in North America, and its distribution and ecology poorly documented. It may possibly be an introduction, like Atrichum undulatum, another common European species believed to be introduced here.


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