Acaulon triquetrum

(Spruce) Müller Hal.

Bot. Zeitung (Berlin) 5: 100. 1847,.

Basionyms: Phascum triquetrum Spruce London J. Bot. 4: 189. 1845
Treatment appears in FNA Volume 27. Treatment on page 638. Mentioned on page 639.

Plants three-angled, about 1 mm. Stem-leaves cuspidate, keeled; laminal cells, 13–18 µm wide, 1–3: 1, smooth. Seta as long as the diameter of the capsule. Spores 25–30 (–40) µm, finely papillose.


Phenology: Capsules mature late autumn-spring.
Habitat: Soil, sand, clay, old fields, pastures, roadside banks, temporarily moist areas
Elevation: low to moderate elevations

Distribution

V27 940-distribution-map.gif

Ont., Sask., Calif., Ill., Iowa, Mass., N.J., Tex., Va., W.Va., Europe, Asia, n Africa, Australia

Discussion

Acaulon muticum var. rufescens has reflexed apices while A. triquetrum does not always have these, though illustrated as such by H. A. Crum and L. E. Anderson (1981). The exsiccat C. F. Austin, Musci Appalachiani 52 has a short seta and the plant is 1.2 mm, and is placed here with A. muticum var. rufescens.

Selected References

None.

Lower Taxa

None.

... more about "Acaulon triquetrum"
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.175 cm1.75 mm <br />0.00175 m <br />) +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
appressed +  and weakly spreading +
Acute (?) +  and Ovate (?) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Richard H. Zander +
(Spruce) Müller Hal. +
rounded +
papillose +  and smooth +
usually slightly wider +
not differentiated +
Phascum triquetrum +
obovoid +
lobed +  and mitrate +
cleistocarpous +
sexual +  and asexual +
vesiculose +  and thick-walled +
Few (?) +  and Several (?) +
elongate-rhomboid +  and elongate +
tomentose +  and bare +
dentate +, entire +  and serrulate +
roundedquadrate;rhomboid +
Ont. +, Sask. +, Calif. +, Ill. +, Iowa +, Mass. +, N.J. +, Tex. +, Va. +, W.Va. +, Europe +, Asia +, n Africa +  and Australia +
low to moderate elevations +
differentiated +
multicellular +
Soil, sand, clay, old fields, pastures, roadside banks, temporarily moist areas +
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 +
spathulate +  and ovate +
reduced +
dentate +  and entire +
short-conic;short-rostrate +
photosynthetic +
flattened +  and 2-fid +
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 +
Capsules mature late autumn-spring. +
1 (?) +, 3 (?) +  and 4 (?) +
not differentiated +
Bot. Zeitung (Berlin) +
straight +
elongate +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
2 +  and 1 +
red +  and laminal +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Acaulon triquetrum +
species +
ovoid;cylindric +
yellow distally and red +, orange +, red +  and yellow +
brown;reddish;yellowish-brown distally +
paroicous +, monoicous +  and dioicous +