Polytrichastrum sexangulare var. sexangulare

Treatment appears in FNA Volume 27. Treatment on page 129.

Plants small to medium, in loose tufts. Stems with cortical cells thin-walled. Leaves loosely to densely imbricate, erect-incurved at the tips, often ± secund, obtusely cucullate; sheath broadly elliptic, contracted to the blade; marginal lamina 2–6 cells wide, slightly broader and inflexed in the distal part of blade; perichaetial leaves similar to the foliage leaves. Seta straight. Capsule (4–) 5–6-angled to terete; short-cylindric to ovoid to subglobose; peristome teeth 50–64, slender, of uniform size.


Habitat: Damp gravelly soil and rocks, snowbed communities and beside snow-melt streams
Elevation: moderate to high elevations

Distribution

V27 154-distribution-map.gif

Greenland, Alta., B.C., Nfld. and Labr., N.W.T., Nunavut, Que., Yukon, Alaska, Mont., Utah, Wash., Wyo., Europe, Asia (Japan), Asia (Russia in s Siberia), Atlantic Islands (Iceland)

Discussion

In Nunavut, var. sexangulare is known from Baffin Island. Even when sterile, it can usually be recognized by secund, tubulose leaves with an obtusely cucullate apex. Polytrichastrum alpinum var. septentrionale is similar, but has papillose lamellae, and the leaf apex is not cucullate.

Selected References

None.

Lower Taxa

None.

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

prominent +
Gary L. Smith Merrill +
(Bridel) G. L. Smith +
toothed +
differentiated +
Polytrichum sexangulare +
distinct +
tubular +  and lanceolate +
broadened +
thin-walled +
not pitted +  and papillose +
monoicous +, dioicous +, sexual +  and vegetative +
sparsely ciliate;smooth +
cucullate +
erect;horizontal +
short-cylindric +  and ovoid +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
excurrent +  and percurrent +
prolonged +
mucronate +  and cucullate +
undifferentiated +
Greenland +, Alta. +, B.C. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Que. +, Yukon +, Alaska +, Mont. +, Utah +, Wash. +, Wyo. +, Europe +, Asia (Japan) +, Asia (Russia in s Siberia) +  and Atlantic Islands (Iceland) +
moderate to high elevations +
scabrous +, mammillose +  and smooth +
Damp gravelly soil and rocks, snowbed communities and beside snow-melt streams +
cylindric +  and tapering +
photosynthetic +
5 +  and 8 +
serrate +, crenulate +  and serrulate +
cucullate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
1(-3)-stratose +
papillose +  and smooth +
crenulate +  and serrulate +
shape +  and size +
polygamous +, dioicous +  and sexual +
narrowly ovate;pyriform +
sharply toothed +  and entire +
interwoven +
toothlike +
Mem. New York Bot. Gard. +
underground +
undifferentiated +
straight +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
hyaline-margined +
elongate-rectangular +
tapering +
differentiated +
larger +  and minute +
secund +  and simple +
erect-spreading +, decumbent +  and erect +
cucullate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Polytrichastrum sexangulare var. sexangulare +
Polytrichastrum sexangulare +
variety +
unjointed +
triangular +
smaller +  and slender +
dark green +  and reddish-brown +
small +  and medium +