Syntrichia obtusissima

(Müller Hal.) R. H. Zander

Bull. Buffalo Soc. Nat. Sci. 32: 269. 1993,.

Basionym: Barbula obtusissima Müller Hal. Syn. Musc. Frond. 1: 640. 1849
Synonyms: Tortula obtusissima (Müller Hal.) Mitten
Treatment appears in FNA Volume 27. Treatment on page 624. Mentioned on page 619, 625, 627.

Stems (5–) 10–20 mm. Leaves clasping at base, infolded, and twisted around the stem when dry, widespreading to squarrose when moist, lingulate to spatulate, 3–4 × 1–1.5 mm, keeled; margins revolute in the proximal 3/4–7/8, entire, often laxly undulate; apices emarginate to retuse, occasionally truncate or acute; costa excurrent into a toothed, hyaline awn (often brown at base) usually longer than the leaf, yellow or brown, often minutely papillose abaxially (but not serrate because of projecting cell ends); basal-cells abruptly differentiated, rectangular, 70–90 (–100) × 22–40 µm, often with yellow walls, narrowly rectangular at the margins; distal cells quadrate to polygonal, 15–23 µm, thin-walled, pellucid, bulging and bearing 4–7 papillae per cell. Specialized asexual reproduction absent. Sexual condition autoicous, although perigonia often lacking, apparently sometimes dioicous. Seta redbrown, 10–15 mm. Capsule yellowish or reddish-brown, 3–4.5 mm, straight or slightly curved, with an abrupt neck; operculum 1.5–2 mm, reddish-brown; peristome ca. 1.5 mm, the distal divisions twisted ca. 2 turns, yellow or red, the basal membrane white, 1/3 the total length. Spores 9–16 µm, papillose.


Habitat: Soil, rock, rarely the bases of trees
Elevation: moderate to high elevations

Distribution

V27 913-distribution-map.gif

Ariz., N.Mex., Tex., Mexico, South America (Bolivia), South America (Peru)

Discussion

Syntrichia obtusissima, with a distinctive Southwest and Mexican-Andean disjunction, has been much confused with S. ruralis, leading to many misidentified specimens in herbaria, but the large, pellucid leaf cells (about 15–23 µm) contrast with those of S. ruralis (about 8–12 µm), and the back of the costa lacks serrations from projecting cell ends. Furthermore, it has a clear central strand in the stem, and hydroids in the costa, neither of which is found in S. ruralis.

Selected References

None.

Lower Taxa

None.
... more about "Syntrichia obtusissima"
elongate +  and quadrate +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
apiculate +, emarginate +  and truncate +
Brent D. Mishler +
(Müller Hal.) R. H. Zander +
usually longer +
toothed +
reniform +  and rounded +
rectangular +
papillose +  and smooth +
usually slightly wider +
usually ovate;oblong +
Barbula obtusissima +
obovoid +
not differentiated +
brown +  and yellow +
acute +  and long-cucullate +
reddish-brown +  and yellowish +
curved +  and straight +
cleistocarpous +  and stegocarpous +
striolate +
cylindric +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
monoicous +, dioicous +  and sexual +
flat to bulging +
vesiculose +  and thick-walled +
Few (?) +  and Several (?) +
elongate-rhomboid +  and elongate +
tomentose +  and bare +
brown +  and yellow +
usually longer +
papillose +
sometimes slightly longer than wide +
sexual +  and asexual +
quadrate +  and polygonal +
large +  and small +
red +  and yellow +
Ariz. +, N.Mex. +, Tex. +, Mexico +, South America (Bolivia) +  and South America (Peru) +
moderate to high elevations +
differentiated +
multicellular +
Soil, rock, rarely the bases of trees +
yellow +  and orange-red or red +
strong +  and weak +
1 +  and 3 +
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 +
infolded +
reduced +
undulate +
pale +  and colored +
distinct +
reddish-brown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
photosynthetic +
compound +, simple +, hollow +  and solid +
4 +  and 7 +
flattened +  and 2-fid +
lateral +  and terminal +
blunt +, oblong-lingulate +  and ovate +
lateral +  and terminal +
1.5 cm15 mm <br />0.015 m <br /> (?) +
red +, orange +  and yellow +
consisting of 16 mostly 2 times cleft spiculose striate or papillose lanceolate teeth , , , , +  and rudimentary +
synoicous +, autoicous +, dioicous +  and sexual +
cylindric +  and spherical +
Bull. Buffalo Soc. Nat. Sci. +
straight +
elongate +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
2 +  and 1 +
brick-red +  and laminal +
3mm;4mm +
widespreading +  and squarrose +
keeled +, lingulate +  and spatulate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1mm +  and 1.5mm +
Tortula obtusissima +
Syntrichia obtusissima +
Syntrichia +
species +
ovoid;cylindric +
stemless +  and perigoniate +
green;yellow or redbrown +
small +  and large +