Polytrichum juniperinum

Hedwig

Sp. Musc. Frond., 89, plate 18, figs. 6–10. 1801,.

Synonyms: Polytrichum alpestre Hoppe Polytrichum juniperinum var. alpestre (Hoppe) Röhling Polytrichum juniperinum var. waghornei Kindberg
Treatment appears in FNA Volume 27. Treatment on page 138. Mentioned on page 37, 38, 92, 135, 139, 140.

Plants small to medium to fairly robust, gray-green to bluish green to reddish-brown with age, in loose tufts, often forming extensive patches. Stems (1–) 4–5 (–10) cm, simple, brownish tomentose only near the base. Leaves 3–6 (–8) mm, densely imbricate, ± erect and almost straight when dry, erect-spreading to widely spreading when moist; sheath oblong-rectangular, yellowish, tapering to the blade; blade slender, bluish green and nitid, rather flat, with sharply infolded margins; marginal lamina 5–7 cells wide, 1-stratose, entire or minutely crenulate, membranous and transparent, enclosing the lamellae and overlapping towards the apex; costa usually somewhat toothed distally, excurrent, forming a subulate, toothed awn, the awn reddish-brown throughout or slightly decolorate at tip; lamellae bluntly crenate in profile, 6–8 cells high, the marginal cells in cross-section ovate to pyriform, thick-walled, ending in a distinct knob, smooth or rarely faintly papillose, the marginal cells of lateral lamellae (enclosed by the overlapping margins) ovoid and less strongly thickened; sheath cells 70–100 × 6–10 µm, narrowly rectangular (4–6:1), narrower toward the margin; cells of the broad marginal lamina transversely elongate, very thick-walled. Sexual condition dioicous; perigonial rosettes yellowish to reddish green; perichaetial leaves longer than the foliage leaves, long-sheathing, the blade almost obsolete, ending in a slender yellowish or hyaline awn. Seta (1–) 3–5 cm, stout, yellowish to reddish-brown. Capsule 2.5–5 mm, rectangular, longer than wide (1.5–2:1), reddish-brown to dark-brown, glaucous when fresh, suberect, becoming horizontal when mature, sharply 4-angled and prismatic; peristome 200–240 µm, divided to 0.6–0.8, the teeth 64, keeled at back. Calyptra whitish to light-brown, covering the capsule. Spores 6–10 (–12) µm.


Habitat: Exposed, well-drained, mostly acid soils in old fields and open woods, in openings following forest fire, on trailside banks and road cuts, on thin shallow soil overlying rocks, blowdowns and open ridge tops near timberline, only rarely in moist or wet situations
Elevation: low to high elevations

Distribution

V27 169-distribution-map.gif

Greenland, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Yukon, Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Del., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Mexico, West Indies, Central America, s South America, Europe, n, c Asia, Atlantic Islands (Macaronesia), Pacific Islands (New Zealand), Australia, Antarctica

Discussion

Polytrichum juniperinum occurs on a variety of substrates, but primarily in dryer situations than P. commune or P. strictum. It often forms extensive pure stands of a distinctive pale bluish green color from the reflection of light off the thin, membranous margins of the leaves. The narrow leaf blades are widely spreading and have short, reddish awns. Polytrichum juniperinum is common and generally distributed throughout continental North America. In the high Arctic, however, the species is rare and many older reports of it actually pertain to 5. P. hyperboreum (D. G. Long 1985).

Selected References

None.

Lower Taxa

None.

"wide" is not a number."broader" is not a number."um" is not declared as a valid unit of measurement for this property. "um" is not declared as a valid unit of measurement for this property.

... more about "Polytrichum juniperinum"
gray-green;bluish green +
extensive +
prominent +
Gary L. Smith Merrill +
Hedwig +
hyaline +, yellowish +, slender +, decolorate +  and reddish-brown +
toothed +  and subulate +
bluish green +
weakly-developed +
abrupt +, crisped +  and undulate +
slender +
broadened +
overlapping +
thick-walled +  and 1-stratose +
overlapping +
transparent +
dioicous +  and sexual +
membranous +
sparsely ciliate;smooth +
whitish;light-brown +
cucullate +
reddish-brown +  and dark-brown +
longer +  and longer than wide +
horizontal;suberect +
divided +, rectangular +, prismatic +  and 4-angled +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
prolonged +
toothed +
undifferentiated +
ovate;pyriform +
Greenland +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Yukon +, Ala. +, Alaska +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +, Mexico +, West Indies +, Central America +, s South America +, Europe +, n +, c Asia +, Atlantic Islands (Macaronesia) +, Pacific Islands (New Zealand) +, Australia +  and Antarctica +
low to high elevations +
bulging-mammillose +
scabrous +, mammillose +  and smooth +
Exposed, well-drained, mostly acid soils iExposed, well-drained, mostly acid soils in old fields and open woods, in openings following forest fire, on trailside banks and road cuts, on thin shallow soil overlying rocks, blowdowns and open ridge tops near timberline, only rarely in moist or wet situationsne, only rarely in moist or wet situations +
distinct +
closely-spaced +
photosynthetic +
6 +  and 8 +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
straight +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
1(-3)-stratose +
cuticular-papillose +  and smooth +
infolded +
shape +  and size +
papillose +  and smooth +
dioicous +  and sexual +
inflexed +  and erect +
toothed +  and plane +
gray-green;bluish green +
extensive +
pigmented +  and pale +
single +  and 64 +
slit-like +  and circular +
Sp. Musc. Frond., +
underground +
differentiated +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
yellowish +  and reddish-brown +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
hyaline-margined +
rectangular +
tapering;oblong-rectangular +
differentiated +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Polytrichum alpestre +, Polytrichum juniperinum var. alpestre +  and Polytrichum juniperinum var. waghornei +
Polytrichum juniperinum +
Polytrichum +
species +
unjointed +
loose +  and compact +
small +  and medium +