Dicranum groenlandicum

Bridel

Muscol. Recent., suppl. 4: 68. 1818,.

Treatment appears in FNA Volume 27. Treatment on page 416. Mentioned on page 399, 400.

Plants in dense tufts, light green, glossy. Stems 4.5–10 cm, tomentose 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 ovatelanceolate 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-stratose 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.


Phenology: Capsules mature in summer.
Habitat: Arctic or alpine tundra, soil, humus or rocks, sometimes in bogs and fens
Elevation: 10-3800 m

Distribution

Greenland, Alta., B.C., Man., Nfld. and Labr. (Nfld.), N.W.T., Nunavut, Ont., Que., Yukon, Alaska, Colo., N.Y., Europe, Asia

Discussion

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.

Selected References

None.

Lower Taxa

None.

... more about "Dicranum groenlandicum"
persistent +  and deciduous +
differentiated +
Robert R. Ireland Jr. +
Bridel +
short to long +
differentiated +
ovatelanceolate +
microphyllous +
pseudomonoicous +, dioicous +, autoicous +  and sexual +
flagelliform +  and terete +
reproduction +  and asexual +
cucullate +
yellowish-brown +
cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
2-stratose +  and 1-stratose +
generally orange +  and brown +
specialized +
papillose +  and mammillose +
pseudomonoicous +, dioicous +  and sexual +
inflated +
enlarged +
well-differentiated +
subpercurrent +
1/10 +  and 1/6 +
toothed +
dioicous +  and sexual +
spreading +, erect-patent +  and erect-appressed +
smooth +  and rugose +
Greenland +, Alta. +, B.C. +, Man. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, Nunavut +, Ont. +, Que. +, Yukon +, Alaska +, Colo. +, N.Y. +, Europe +  and Asia +
reddish-brown +  and pitted-striolate +
10-3800 m +
Arctic or alpine tundra, soil, humus or rocks, sometimes in bogs and fens +
enlarged +
falcate-secund +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
papillose +, mammillose +, nonpitted +  and pitted +
3mm;4mm +
acute +  and obtuse +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +
arcuate +  and straight +
long-rostrate +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
nonpitted +  and pitted +
toothed +  and forked +
short-acuminate +, concave +  and ovate +
pitted-striolate +
16 +  and single +
papillose +  and striolate +
Capsules mature in summer. +
undifferentiated +
Muscol. Recent., suppl. +
red +  and brown +
smooth +  and papillose +
1 +  and 2 +
well-developed +
yellow;reddish yellow +
flexuose +  and straight +
0 +  and 6 +
elongate +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1/3 +  and 1/2 +
spherical +
4.5 cm45 mm <br />0.045 m <br /> (10 cm100 mm <br />0.1 m <br />) +
superficial +
Dicranum groenlandicum +
Dicranum +
species +
deciduous +
lanceolate +
female +  and male +