Dicranum tauricum

Sapjegin

Bot. Jahrb. Syst. 46: 10. 1911,.

Synonyms: Dicranum strictum D. Mohr
Treatment appears in FNA Volume 27. Treatment on page 418. Mentioned on page 398, 399, 417, 420.

Plants in dense tufts, light green to yellowish green, glossy. Stems 0.5–3 cm, tomentose below with whitish or reddish-brown rhizoids. Leaves straight, erect-spreading, little changed when dry, smooth, 4–6 × 0.2–0.4 mm, most of the leaf tips deciduous and absent, lanceolate, concave proximally, tubulose distally, apex acute; margins entire or serrulate at apex; laminae 1-stratose or with 2-stratose regions near apex; costa long-excurrent, 1/6–1/4 the width of the leaves at base, abaxial ridges absent; leaf cells smooth, with a row of guide cells, no stereid bands, 1 or 2 rows of cells above and below guide cells with slightly thickened walls and large lumens, the adaxial and abaxial epidermal layers of cells not differentiated; cell-walls between lamina cells not bulging; alar cells 1-stratose, differentiated, not extending to costa; proximal laminal cells rectangular to linear, with a few pits, (46–) 60–105 (–120) × (4–) 6–16 (–22) µm; distal laminal cells quadrate, rounded or short-rectangular, not pitted, (12–) 17–25 (–32) × (8–) 10–11 (–12) µm. Sexual condition dioicous; male plants as large as females; interior perichaetial leaves gradually narrowed to a subulate apex, convolute-sheathing. Seta 1.5–2.5 cm, solitary, yellow to light-brown. Capsule 1.4–2.5 mm, straight and erect, smooth, often irregularly wrinkled when dry, yellow to light-brown; operculum 1–1.8 mm. Spores 10–18 µm.


Phenology: Capsules mature in summer.
Habitat: Frequently on rotten logs, stumps, or tree bases in woodlands, sometimes on humus or humus over rock
Elevation: 150-2200 m

Distribution

V27 594-distribution-map.gif

Alta., B.C., N.W.T., Sask., Alaska, Calif., Colo., Idaho, Mont., Nebr., Oreg., S.Dak., Utah, Wash., Wyo., Europe

Discussion

Dicranum tauricum has been reported from Utah by S. Flowers (1973). It is a western North American species, occurring on trees and rotten wood. It is recognized as glossy plants with broken off leaf tips and straight, erect capsules. It can be confused with D. fragilifolium, which also has broken off leaf tips and whose range overlaps with D. tauricum. For distinctions see discussion under 21. D. fragilifolium.

Selected References

None.

Lower Taxa

None.

... more about "Dicranum tauricum"
persistent +  and deciduous +
differentiated +
Robert R. Ireland Jr. +
Sapjegin +
short to long +
2 +  and 1 +
differentiated +
microphyllous +
pseudomonoicous +, dioicous +, autoicous +  and sexual +
flagelliform +  and terete +
reproduction +  and asexual +
cucullate +
yellow +  and light-brown +
cylindric +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
generally orange +  and brown +
specialized +
papillose +  and mammillose +
pseudomonoicous +, dioicous +  and sexual +
inflated +
differentiated +
long-excurrent +
1/6 +  and 1/4 +
toothed +
dioicous +  and sexual +
spreading +, erect-patent +  and erect-appressed +
smooth +  and rugose +
Alta. +, B.C. +, N.W.T. +, Sask. +, Alaska +, Calif. +, Colo. +, Idaho +, Mont. +, Nebr. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wyo. +  and Europe +
reddish-brown +  and pitted-striolate +
150-2200 m +
Frequently on rotten logs, stumps, or tree bases in woodlands, sometimes on humus or humus over rock +
with 2-stratose regions +  and 1-stratose +
enlarged +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
falcate-secund +
papillose +, mammillose +, nonpitted +  and pitted +
straight +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
serrulate +  and entire +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
arcuate +  and straight +
long-rostrate +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 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. +
6um;16um +
undifferentiated +
rectangular +  and linear +
Bot. Jahrb. Syst. +
reddish-brown +  and whitish +
smooth +  and papillose +
1 +  and 2 +
well-developed +
1 (?) +  and 3 (?) +
yellow;light-brown +
flexuose +  and straight +
0 +  and 6 +
elongate +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1/3 +  and 1/2 +
spherical +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
superficial +
Dicranum strictum +
Dicranum tauricum +
Dicranum +
species +
deciduous +
lanceolate +
light green +  and yellowish green +
female +  and male +