Brachythecium coruscum

I. Hagen

Kongel. Norske Vidensk. Selsk. Skr. (Trondheim) 1908(3): 3. 1908.

Synonyms: Brachythecium albicans var. groenlandicum C. E. O. Jensen B. groenlandicum
Treatment appears in FNA Volume 28. Treatment on page 424. Mentioned on page 416, 423, 425.

Plants medium-sized to large, in loose to fairly dense mats, pale stramineous, pale-yellow, rich golden, or light-brown. Stems to 7 cm, creeping, ascending to upright, terete-foliate, irregularly pinnate, branches to 7 mm, straight to slightly flexuose, terete-foliate. Stem-leaves appressed, straight or slightly falcate, closely to more rarely loosely imbricate, ovate, broadest at 1/7–1/5 leaf length, concave, plicate, 1.5–2.4 × 0.5–1 mm; base slightly narrowed, narrowly short-decurrent; margins plane or often recurved almost throughout, entire to slightly serrulate, usually more serrulate in acumen; apex gradually tapered, short to moderately acuminate; costa to 40–70% leaf length, strong proximally, gradually tapering distally, often very weak near end, terminal spine absent; decurrency cells short-rectangular; alar cells subquadrate to short-rectangular, small, 12–20 × 10–13 µm, walls moderately thick, region extensive, of 6–15 × 6–10 cells; laminal cells elongate or rarely short-rhombic throughout, 30–80 × 6–8 µm; basal-cells to 8 (–10) µm wide, region in 2 or 3 rows. Branch leaves smaller, narrower. Sexual condition dioicous. Sporophytes unknown.


Habitat: Soil, rock, Arctic and alpine environments
Elevation: low to high elevations (0-3300 m)

Distribution

V28 657-distribution-map.gif

Greenland, Alta., B.C., Yukon, Alaska, n Eurasia

Discussion

Brachythecium coruscum is quite common in Greenland, Alaska, and Arctic Canada. The species is similar to B. albicans, from which it differs principally in short leaf decurrencies that rarely come off with detached leaves and shorter laminal cells, in many leaves only few cells being longer than 50 µm. Plants of B. coruscum are usually more enriched with yellow than B. albicans, which is much paler and whitish to stramineous. The leaf acumina are erectopatent to patent, often falcate-secund, and the alar regions are square to elongate.

Selected References

None.

Lower Taxa

None.

"long" is not a number."broad" is not a number.

... more about "Brachythecium coruscum"
separating +  and not separating +
dioicous +, autoicous +  and sexual +
Michael S. Ignatov +
I. Hagen +
0um +  and 8um +
short-decurrent +
rounded +  and narrowed +
narrowed +
short to long +
terete-foliate +
straight;slightly flexuose +
dioicous +  and sexual +
cucullate +
straight +  and curved +
pendent +, horizontal +  and inclined +
cylindric;elongate;cylindric;elongate;ovate +
specialized +
synoicous +, dioicous +, autoicous +, sexual +  and asexual +
subquadrate +  and short-rectangular +
differentiated +
10um +  and 13um +
3 (?) +  and 2 (?) +
discernible +
short-rectangular +
Greenland +, Alta. +, B.C. +, Yukon +, Alaska +  and n Eurasia +
low to high elevations (0-3300 m) +
not adherent +
Soil, rock, Arctic and alpine environments +
6um (?) +  and 8um (?) +
weak +  and strong +
tapering +
moderate to somewhat +
serrulate +, entire +  and slightly serrulate +
short-rostrate +  and conic +
perfect +  and xerocastique +
hygrocastique +
not plicate +  and crumpled +
Kongel. Norske Vidensk. Selsk. Skr. (Trondheim) +
pellucid +, opaque +  and otherwise +
not +  and conspicuous +
extensive +
darker +  and redbrown +
spaced;imbricate;or;falcate-secund +
1.5mm;2.4mm +
patent +, spreading +  and erect +
concave +  and falcate +
terete-foliate +
not reddish +
ascending +  and upright +
0 cm0 mm <br />0 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Brachythecium albicans var. groenlandicum +  and B. groenlandicum +
Brachythecium coruscum +
Brachythecium +
species +
incrassate +
light-brown +, golden +, rich +, pale-yellow +  and pale stramineous +
medium-sized;large +