Difference between revisions of "Distichium hagenii"
Rev. Bryol. 23: 36, plate 1, figs. 2, 3. 1896,.
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Revision as of 21:54, 16 December 2019
Stems to ca. 2 cm, occasionally longer. Sexual condition paroicous or synoicous. Seta to 2 cm, straight to somewhat flexuose, smooth, red or reddish brown, occasionally yellowish brown. Capsule brown, 1–1.5 mm, inclined, ovoid to oblong-ovoid, becoming ± wrinkled when dry; operculum to 0.3 mm; peristome teeth 16, united below by a pale yellow or hyaline membrane, the teeth in 8 groups of 2, irregularly split and perforated, smooth or very finely papillose. Spores finely papillose to roughened, 30–45 µm.
Phenology: Capsules mature late summer–fall.
Habitat: Usually calcareous soil, often in frost cushions
Elevation: low to high elevations
Distribution
Greenland, N.W.T., Nunavut, Alaska, n and Arctic Europe, e Asia (China, Mongolia), Arctic Asia (Siberia).
Discussion
Distichium hagenii is a primarily high Arctic or high elevation species, morphologically close to D. inclinatum and sometimes considered as synonymous with that species. The primary difference is in the peristome. The 16 peristome teeth of D. hagenii are grouped in eight pairs united by a pale yellowish basal membrane, each tooth irregularly split and perforate. A report of the species from Newfoundland is referable to D. inclinatum (redetermined by G. R. Brassard according to H. A. Crum and L. E. Anderson 1981). In the southern part of the European range, it grows on sandy or loam soil close to the sea.
Selected References
None.