Gyroweisia tenuis

(Schrader ex Hedwig) Schimper

Syn. Musc. Eur. ed. 2, 38. 1876,.

Basionym: Gymnostomum tenue Schrader ex Hedwig Sp. Musc. Frond., 37, plate 4, figs. 1–4. 1801
Treatment appears in FNA Volume 27. Treatment on page 524.

Plants scattered or very loosely cespitose. Stem to 0.4 cm, central strand absent. Leaves 0.25–1 (–1.4) mm, erect to incurved when dry, spreading when moist, base broadened in lower 1/3–1/2, long-rectangular; margins entire; costa ending 2–4 cells below the apex, cells of adaxial surface elongate and flat (not bulging), costa in section with 1 or 2 stereid bands or costa homogeneous; distal laminal cells quadrate, with 3–4 irregular to 2-fid papillae, walls thin and evenly thickened, lumens angular; basal-cells differentiated across leaf, filling the leaf base; medial cells hyaline to yellowish, smooth or weakly papillose above, 10–12 µm wide, 2–4: 1, walls thin. Specialized asexual reproduction commonly present in sterile material as gemmae in the axils of leaves, elongate, irregularly clavate, short-branching, or spindle-shaped, of mostly 4–10 cells. Sexual condition dioicous; perichaetial leaves strongly differentiated and sheathing the seta. Capsule lacking peristome, annulus revoluble, operculum short-conic.


Habitat: Thin soil and in rock crevices, sandstone, calcareous rock
Elevation: low to moderate elevations (70-1000 m)

Distribution

V27 753-distribution-map.gif

Greenland, N.W.T., N.S., Ont., Alaska, Iowa, Mich., Nebr., Europe, Asia (China), Asia (Middle East), n Africa

Discussion

Gyroweisia tenuis is similar to and often confused with Gymnostomum aeruginosum but the latter has elongate leaves that are commonly acute (occasionally apiculate by a single cell), with quadrate to rectangular (but bulging) cells on the adaxial surface of the costa, gemmae are absent, the perichaetial leaves are little differentiated from the cauline or sheathing the seta only in lower 1/3 of leaf, the annulus is vesiculose but persistent, and the operculum is long-conic. Specimens from the upper Great Lakes region are generally fruiting and have very short stems. A comparatively long-stemmed specimen lacking sporophytes from Nebraska (Brown County, Churchill 12286, BC, DUKE, MO) has the characteristic narrowly rectangular cauline leaves and immature but strongly differentiated perichaetial leaves of Gyroweisia tenuis, and several-celled ovoid or spindle-shaped gemmae arising from axils of terminal leaves of sterile axes. It is distinguished from Gymnostomum calcareum by the present of gemmae, and from Gymnostomum viridulum by the narrowly rectangular leaves.

Selected References

None.

Lower Taxa

None.
... more about "Gyroweisia tenuis"
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
Richard H. Zander +
(Schrader ex Hedwig) Schimper +
short-branching +
spindle--shaped +, clavate +  and elongate +
papillose +  and smooth +
usually slightly wider +
long-rectangular +
differentiated +
broadened +
Gymnostomum tenue +
obovoid +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
cucullate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
cleistocarpous +  and stegocarpous +
ovate;short-cylindric +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
brown +  and green +
dioicous +  and sexual +
superficially flat +  and convex +
thin;evenly thickened +
4 (?) +  and 10 (?) +
elongate +
tomentose +  and bare +
homogeneous +
rectangular;quadrate +
Greenland +, N.W.T. +, N.S. +, Ont. +, Alaska +, Iowa +, Mich. +, Nebr. +, Europe +, Asia (China) +, Asia (Middle East) +  and n Africa +
low to moderate elevations (70-1000 m) +
differentiated +
shortly rectangular +  and rhomboid +
multicellular +
Thin soil and in rock crevices, sandstone, calcareous rock +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
yellow +  and orange-red or red +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
concave;keeled;channeled;ovoid;lanceolate or lingulate +
rectangular to long-ovate +  and ligulate +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
usually broadly lanceolate +  and narrowly elliptical +
reduced +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
papillose +  and smooth +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
short-conic +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
photosynthetic +
simple +  and hollow +
3 +  and 4 +
lateral +  and terminal +
lateral +  and terminal +
red +, orange +  and yellow +
consisting of 16 mostly 2 times cleft spiculose striate or papillose lanceolate teeth , , , , +  and rudimentary +
Syn. Musc. Eur. ed. +
straight +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
yellowbrown +
elongate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
2 +  and 1 +
orange +, yellow +, laminal +  and light-brown +
rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Gyroweisia tenuis +
Gyroweisia +
species +
ovoid;cylindric +
red +  and yellow +
specialized +
dioicous +  and sexual +
stemless +  and perigoniate +
plant +  and cespitose +
occasionally smaller than the perichaetiate +