Species description:
Genus name referring to the many hairs on the calyptra. Species name indicating the Alps, where the species was first collected.
Comments:
This species has been treated under the names Polytrichastrum alpinum, Pogonatum alpinum, Pogonatum macounii and Pogonatum alpinum var. sylvaticum, all of which are considered synonyms.
Distinguishing characteristics:
Useful features include the toothed leaves with numerous lamellae on the upper surface, the lower portion of the stem with extremely reduced leaves that lack lamellae and the usually elongate sporangium that is rounded in cross section.
Habit:
Loose, dark green, turfs 20-150 mm tall, attached to the substratum by rhizoids at the base of the shoots.
Similar Species:
From species of Pogonatum, Polytrichium alpinum differs conspicuously in the time of maturation of the sporangia, in spring and summer instead of autumn. From other Polytrichum species, the sporangium that lacks angles, and the lack of a conspicuous bulge at the apex of the seta where it joins the sporangium, are usually diagnostic.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: Some Common Mosses of BC
Synonyms and Alternate Names:
Pogonatum alpinum (Hedw.) Röhl.
Pogonatum alpinum var. arcticum (Sw. ex Brid.) Brid.
Pogonatum alpinum var. brevifolium (R. Br.) Brid.
Pogonatum alpinum var. campanulatum (Hornsch.) Bruch & Schimp.
Pogonatum alpinum var. macounii (Kindb.) Cardot & Thér.
Pogonatum alpinum var. septentrionale (Sw.) Brid.
Pogonatum alpinum var. sylvaticum (Menz.) Lindb.
Pogonatum macounii (Kindb.) Kindb. & Macoun
Polytrichastrum alpinum var. septentrionale (Sw.) G.L. Sm.
Polytrichum alpinum Hedw.
Polytrichum alpinum var. alpinum
Polytrichum alpinum var. brevifolium (R. Br.) Müll. Hal.
Polytrichum alpinum var. campanulatum (Hornsch.) Müll. Hal.
Polytrichum alpinum var. macounii (Kindb.) K. Saito
Polytrichum alpinum var. septentrionale (Sw.) Lindb.
Polytrichum alpinum var. sylvaticum (Menz.) Lindb.
Polytrichum arcticum Sw. ex Brid.
Polytrichum norvegicum Hedw.