Dicranum pallidisetum

(J. W. Bailey) Ireland

Bryologist 68: 446. 1965,.

Basionyms: Dicranum fuscescens forma pallidiseta J. W. Bailey in J. M. Holzinger, Musci Acroc. Bor.-Amer., no. 653. 1929
Treatment appears in FNA Volume 27. Treatment on page 413. Mentioned on page 400, 414.

Plants in loose tufts, dark green to yellowish green, dull to glossy. Stems 1–6 cm, tomentose with white or reddish-brown rhizoids. Leaves often secund, straight or nearly so, often crisped when dry, smooth, 4–8 × 0.5–1 mm, lanceolate, acute, tubulose to apex; margins entire below, serrulate ot serrate near apex; laminae 1-stratose or sometimes 2-stratose on distal margins; costa excurrent, 1/5–1/3 the width of the leaves at base, abaxially papillose or toothed from leaf middle to apex, abaxial ridges absent, with a row of guide cells, stereid bands often present and well-developed in proximal part of leaf, absent in distal 1/4–1/3 of leaf, cells above and below guide cells large and thin-walled; cell-walls between lamina cells not or slightly bulging; leaf cells smooth or often strongly papillose in distal half of leaf; alar cells 2-stratose, differentiated, often extending to costa, abaxial ridges absent; proximal laminal cells linear to rectangular, with or without pits, (26–) 58–95 (–130) × (10–) 12–14 (–16) µm; distal laminal cells quadrate, rounded, irregularly angled or short-rectangular, not pitted, (10–) 15–26 (–38) × (8–) 9–11 (–12) µm. Sexual condition dioicous; male plants as large as female plants; interior perichaetial leaves abruptly short-acuminate, convolute-sheathing. Seta 1–2.5 cm, solitary or sometimes 2, rarely 3, per perichaetium, yellow, rarely reddish yellow or brown with age. Capsule 1.5–3.5 mm, arcuate, inclined, often with a small struma, strongly furrowed when dry, contracted below mouth, yellow or yellowish-brown, rarely reddish yellow or brown with age; operculum 1.5–2.5 mm. Spores 14–20 µm.


Phenology: Capsules mature in summer.
Habitat: Humus or soil over rock, rarely rotting logs or decayed wood
Elevation: 500-2000 m

Distribution

V27 586-distribution-map.gif

Alta., B.C., Alaska, Idaho, Mont., Oreg., Wash.

Discussion

Dicranum pallidisetum has often been confused with D. fuscescens, being considered a form of it for many years (R. R. Ireland 1966). Unlike that species, which often occurs at low altitudes below 800 m, D. pallidisetum occurs predominately at high elevations, 800–2000 m, rarely being found as low as 500 m. It is distinguished from D. fuscescens by its tubulose leaves, usually 1-stratose or rarely 2-stratose on the margins, by its costa cross section that shows no stereid bands in the distal 1/3 of the leaf, and by its yellow or yellow-brown capsules that are sometimes 2–3 per perichaetium. In contrast, D. fuscescens has leaves keeled above, usually 2-stratose on both margins, rarely 1-stratose on one margin, stereid bands present throughout the leaf and dark brown to reddish brown capsules that are solitary or rarely 2 per perichaetium.

Selected References

None.

Lower Taxa

None.

... more about "Dicranum pallidisetum"
persistent +  and deciduous +
differentiated +
Robert R. Ireland Jr. +
(J. W. Bailey) Ireland +
short to long +
well-developed +
differentiated +
Dicranum fuscescens +
microphyllous +
pseudomonoicous +, dioicous +, autoicous +  and sexual +
flagelliform +  and terete +
reproduction +  and asexual +
cucullate +
brown +, reddish yellow +, yellowish-brown +  and yellow +
arcuate +  and straight +
cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
generally orange +  and brown +
specialized +
not pitted +
dioicous +  and sexual +
rounded +  and quadrate +
differentiated +
9um +  and 11um +
1/5 +  and 1/3 +
toothed +
papillose +
spreading +, erect-patent +  and erect-appressed +
smooth +  and rugose +
Alta. +, B.C. +, Alaska +, Idaho +, Mont. +, Oreg. +  and Wash. +
reddish-brown +  and pitted-striolate +
500-2000 m +
Humus or soil over rock, rarely rotting logs or decayed wood +
2-stratose +  and 1-stratose +
enlarged +
falcate-secund +
nearly +  and straight +
4mm;8mm +
acute +, lanceolate +  and crisped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
serrate +, serrulate +  and entire +
arcuate +  and straight +
long-rostrate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 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. +
not pitted +
dioicous +  and sexual +
rounded +  and quadrate +
9um;11um +
undifferentiated +
short-rectangular +, angled +, linear +  and rectangular +
reddish-brown +  and white +
smooth +  and papillose +
1 +  and 2 +
well-developed +
1 (?) +  and 3 (?) +
brown;reddish yellow;yellow +
flexuose +  and straight +
3 +  and 2 +
elongate +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1/3 +  and 1/2 +
spherical +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
superficial +
Dicranum pallidisetum +
Dicranum +
species +
deciduous +
lanceolate +
dark green +  and yellowish green +
dull +  and glossy +