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FNA | Family List | FNA Vol. 27 | Dicranaceae | Arctoa

1. Arctoa anderssonii Wichura, Flora. 42: 432, plate 7, figs. 3-8. 1859.

Arctoa fulvella var. anderssonii (Wichura) Grout

Plants small, in compact, yellow-brown or green tufts. Stems (0.5-)1-2(-4) cm. Leaves erect spreading or falcate-secund, lanceolate, subulate, 2-3 mm; costa 30-55 µm wide at base, long-excurrent, rough near tip; distal laminal cells mostly quadrate (2-5:1), incrassate; basal laminal cells elongate, alar cells differentiated. Perichaetial leaves much larger than stem leaves. Seta short, 1-3 mm. Capsule immersed in perichaetial leaves, straight; peristome teeth spreading outward when dry. Spores 16-27 µm.

Capsules mature summer. Siliceous rock; high elevations; Greenland; Yukon; Europe.

A rare high-arctic species, Arctoa anderssonii was once considered a variety of A. fulvella, but is distinguished by a short seta, large perichaetial leaves, and straight, immersed capsule. It has a costa that is more shortly excurrent than that of A. fulvella but longer than that of A. hyperborea.


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