Conostomum tetragonum

(Hedwig) Lindberg

Öfvers. Kongl. Vetensk.-Akad. Förh. 20: 392. 1863.

Illustrated
Basionym: Mnium tetragonum Hedwig Sp. Musc. Frond., 73. 1801
Synonyms: Conostomum boreale Swartz
Treatment appears in FNA Volume 28. Treatment on page 98. Mentioned on page 99, 198.

Stems brown. Leaves stiffly erect, keeled, 1–1.5 mm; alar cells undifferentiated; basal laminal cells rectangular; distal cells 24–30 × 7–8 µm. Perigonia large, paraphyses subclavate. Perichaetial leaves subulate, base ovate, 2–2.5 mm. Seta yellowish red to brown, 0.8–2.5 cm. Capsule ovoid, slightly asymmetric, 2–2.5 mm, neck short, swollen; operculum obliquely rostrate, beak stout; exostome teeth with border narrow, yellow, connate teeth forming perforated cone. Spores 41–52 µm.


Phenology: Capsules mature Jun–Aug.
Habitat: Thin soil, cliff ledges, among boulders, waterlogged soil of late season snow melt
Elevation: low to high elevations (0-2200 m)

Distribution

V28 151-distribution-map.gif

Greenland, Alta., B.C., N.B., Nfld. and Labr., N.W.T., Nunavut, Que., Yukon, Alaska, Colo., Maine, Mont., N.H., N.Y., Oreg., Wash., Europe, c, n Asia

Discussion

Conostomum tetragonum is easily recognized by its glaucous, stiffly erect leaves in five rows and apically connate peristome teeth. Philonotis seriata (known only from Greenland in the flora area), shares a pentastichous leaf arrangement with C. tetragonum, but the laminal cells of P. seriata are prorulose at the proximal ends and the peristome teeth are free.

Selected References

None.

Lower Taxa

None.
... more about "Conostomum tetragonum"
mammillose-toothed +
Blunt (?) +  and Acuminate (?) +
Dana G. Griffin III +
(Hedwig) Lindberg +
enlarged +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Mnium tetragonum +
cucullate +
erect +  and inclined +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
undifferentiated +
appendiculate +
percurrent;excurrent +
subpercurrent +
mammillose +  and smooth +
rectangular;short-rhomboidal +
Greenland +, Alta. +, B.C. +, N.B. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Que. +, Yukon +, Alaska +, Colo. +, Maine +, Mont. +, N.H. +, N.Y. +, Oreg. +, Wash. +, Europe +, c +  and n Asia +
low to high elevations (0-2200 m) +
linear-lanceolate +
Thin soil, cliff ledges, among boulders, waterlogged soil of late season snow melt +
smooth +, papillose +  and mammillose +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not small +
swollen +
subclavate +
gemmiform +  and cupulate +
Capsules mature Jun–Aug. +
Öfvers. Kongl. Vetensk.-Akad. Förh. +
distinct +
yellowish red;brown +
flexuose +
elongate +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Illustrated +
spheric;reniform +
pentagonal +  and 2-fid +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Conostomum boreale +
Conostomum tetragonum +
Conostomum +
species +
intermediate +
specialized +
dioicous +, sexual +  and asexual +
enlarged +
differentiated +