Cynodontium schisti

(F. Weber & D. Mohr) Lindberg

Öfvers. Kongl. Vetensk.-Akad. Förh. 21: 230. 1864,.

Basionym: Grimmia schisti F. Weber & D. Mohr Index Mus. Pl. Crypt., [2]. 1803
Synonyms: Cnestrum schisti (Wahlenberg) I. Hagen
Treatment appears in FNA Volume 27. Treatment on page 381. Mentioned on page 377, 378, 380.

Stems 0.4–0.8 (–1) cm. Leaves 1.5–1.8 (–2) mm, ovatelanceolate to linear-lanceolate, acute, sharply pointed at the apex; margins flat or partially narrowly recurved, 2-stratose; distal laminal cells strongly mammillose-papillose on both surfaces, thin-walled, rounded to quadrate to irregular, 8–9 µm wide. Perigonium stalked. Seta 0.2–0.3 (–0.4) cm, straight, wet or dry. Capsule straight and erect, striate, not strumose; annulus weakly developed.


Phenology: Capsules mature spring.
Habitat: Rock crevices, soil over rock
Elevation: moderate elevations

Distribution

V27 540-distribution-map.gif

Greenland, Alta., B.C., Nfld. and Labr. (Nfld.), Nunavut, Ont., Que., Sask., Yukon, Alaska, Colo., Maine, Mich., Mont., N.C., S.Dak., Wis., Wyo., Eurasia

Discussion

Cynodontium schisti is distinctive in having undivided peristome teeth that may be perforated. Cynodontium alpestre and C. glaucescens are reported also with poorly divided teeth, commonly divided in the distal 1/4 or to near the middle, whereas all other species of the genus have teeth typically divided to the middle or reaching to nearly the base. If the division of the peristome is part of a transformation series involving Cynodontium and the segregate Cnestrum, then Cynodontium schisti would represent the end-member, with peristome undivided. The operculum is only obliquely conical, rather than the long-rostrate operculum typical of Cynodontium. The cell lumen shape in leaf cross sections is more regularly quadrate rather than distorted-mammillose, and the cells generally have the low, rounded papillae of papillose mosses such as those of the Pottiaceae. The presence of similar quadrate (nonmammillose) lumina in section in C. alpestre and C. glaucescens should be looked for.

Selected References

None.

Lower Taxa

None.
... more about "Cynodontium schisti"
reddish-brown +
persistent +  and deciduous +
large +  and small +
not deciduous +
Patricia M. Eckel +
(F. Weber & D. Mohr) Lindberg +
short to long +
rectangular +  and elongate +
Grimmia schisti +
microphyllous +
pseudomonoicous +, dioicous +, autoicous +  and sexual +
reproduction +  and asexual +
cucullate +
deeply furrowed +  and sulcate +
longitudinally broadly +  and smooth +
not strumose +
differentiated +
deciduous +
papillose +  and mammillose +
differentiated +
percurrent;excurrent +
toothed +
serrulate +  and entire +
mammillose-papillose +
Greenland +, Alta. +, B.C. +, Nfld. and Labr. (Nfld.) +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Maine +, Mich. +, Mont. +, N.C. +, S.Dak. +, Wis. +, Wyo. +  and Eurasia +
moderate elevations +
Rock crevices, soil over rock +
falcate-secund +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pointed +, acute +, ovatelanceolate +  and linear-lanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
erect-flexuose +
acuminate +, keeled +  and tubulose +
cladautoicous +, autoicous +, sexual +  and asexual +
rostrate +  and long-rostrate +
nonpitted +  and pitted +
toothed +  and forked +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
acute +  and rounded-obtuse +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
nearly +, 0 +  and 2/3 +
papillose +  and striolate +
Capsules mature spring. +
undifferentiated +
Öfvers. Kongl. Vetensk.-Akad. Förh. +
hyaline +  and reddish +
roughened +  and smooth +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
dry +  and wet +
straight +
curved-cygneous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spheric +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
superficial +
Cnestrum schisti +
Cynodontium schisti +
Cynodontium +
species +
deciduous +
papillose +
lanceolate +
yellowish green sometimes brownish +  and dark +