Comments
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Dicranum groenlandicum is sometimes not very distinct, often being difficult to separate from its nearest relative, 19. D. elongatum. For distinctions see the discussion under that species.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Plants medium- to large-sized, 3–12 (–15) cm high, yellowish green or brownish green, shiny, in dense tufts. Stems erect, simple or branched, densely tomentose below the middle. Leaves erect, stiff, appressed when dry, erect-spreading when moist, narrowly to ovate-lanceolate, ca. 3.0 mm × 0.6–0.8 mm, gradually to rather quickly narrowed to a subtubulose acumen; margins plane below, slightly involute above, unistratose, nearly entire throughout; costa slender, occupying ca. 1/10 – 1/8 the leaf base width, smooth at back above, percurrent; upper cells rounded rhomboidal, thick-walled, somewhat porose; basal cells elongate, thick-walled, strongly porose; alar cells rounded quadrate, inflated, unistratose, golden brown. Dioicous. Setae slender, ca. 1.5 cm long, yellowish when young, brownish when old; capsules erect or slightly curved when dry, short-cylindric; opercula long-rostrate; annuli in 1–2 rows of large cells; peristome teeth divided to the middle, pale and smooth at tips, vertically striolate below, orange brown. Spores 20–24 µm in diameter, faintly papillose.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Plants in dense tufts, light green, glossy. Stems 4.5-10 cm, tomen-tose throughout with brown to red rhizoids. Leaves erect-spreading, erect-appressed when dry, smooth, (2.5-)3-4(-6.5) × 0.3-0.5 mm, from an ovate-lanceolate base to a tubulose subula, narrowly obtuse at apex, rarely acute, sometimes apical leaves of stems julaceous; margins entire; laminae 1-stratose, occasional 2-stratose regions near costa in proximal part of leaf; costa subpercurrent to percurrent, 1/10-1/6 the width of the leaves at base, smooth, abaxial ridges absent, with a row of guide cells, two well developed and thick stereid bands (5-6 cells thick), adaxial epidermal layer of cells not differentiated, the abaxial layer usually with a few cells enlarged; cell walls between lamina cells slightly bulging; leaf cells smooth; alar cells 1- or 2-stratose, well-differentiated, not extending to costa; proximal laminal cells elongate-sinuose, strongly pitted, (36-)54-65(-98) × (2-)5-6(-9) µm; distal laminal cells (11-)17-26(-42) × (2-)5-6(-12) µm. Sexual condition dioicous; male plants as large as females; interior perichaetial leaves abruptly short-acuminate, convolute-sheathing. Seta 1.5-2 cm, solitary, yellow to reddish yellow. Capsule 1.5-2 mm, nearly straight and erect to slightly arcuate, ± striate when dry, yellowish brown; operculum 1-1.7 mm. Spores 14-19 µm.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
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Distribution: China, Japan, Russia, Europe, and North America.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
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Habitat: on wet soil and rocks or mixed with peat mosses.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Synonym
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Dicranum elongatum Schleich. ex Schwaegr. ssp. groenlandicum (Brid.) Moenk., Laubm. Eur. 210. 1927.
Dicranum elongatum var. sphagni T. Jens., Vidensk. Meddel. Dansk Naturhist. Foren. Kjobenhavn 1858(1–4): 58. 1858.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA