Ptychomitrium incurvum

(Schwägrichen) Spruce

Ann. Mag. Nat. Hist., ser. 2, 3: 487. 1849,.

Basionyms: Weissia incurva Schwägrichen Sp. Musc. Frond. Suppl. 2(1,1): 51. 116. 1823
Treatment appears in FNA Volume 27. Treatment on page 309. Mentioned on page 308.

Plants small, cespitose, glossy, dark green. Stems erect, to 0.5 cm. Leaves crispate when dry, oblong-lanceolate, 2 mm; margins entire distally, erect proximally; apex cucullate to subcucullate. Specialized asexual reproduction rare, short-uniseriate or branched gemmae, several cells long, on branched axillary filaments. Seta 1 per perichaetium, 2–3 mm. Capsule ovoid, 0.75–1 mm, smooth or wrinkled when dry; peristome teeth perforate but mostly not divided, densely papillose. Calyptra lobes about one third length of calyptra.


Phenology: Capsules mature Sep–Jun.
Habitat: Acidic and calcareous rocks, soil, very rarely tree bark, open forests
Elevation: low to moderate elevations (0-1400 m)

Distribution

V27 423-distribution-map.gif

Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va., South America (Ecuador), Europe

Discussion

The small dark green plants of Ptychomitrium incurvum are unmistakable growing on rock, with their glossy leaves tightly crispate when dry. The leaves are shorter than in P. sinense and are straight when wet, not somewhat falcate at the tips as is common in P. sinense. Sporophytes are very common in this moss and the old sporophytes persist for a long time. Sterile colonies of P. incurvum can be very reminiscent of Weissia controversa, but Ptychomitrium is more glossy; its leaves have smooth cells and without the strongly involute margins of Weissia.

Selected References

None.

Lower Taxa

None.

"broad" is not a number.

... more about "Ptychomitrium incurvum"
specialized +
William D. Reese† +
(Schwägrichen) Spruce +
Weissia incurva +
plicate +, smooth +  and naked +
lobed +  and mitrate +
ribbed +  and symmetric +
wrinkled;smooth +
0.075 cm0.75 mm <br />7.5e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Mich. +, Miss. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +, South America (Ecuador) +  and Europe +
low to moderate elevations (0-1400 m) +
branched +  and short-uniseriate +
Acidic and calcareous rocks, soil, very rarely tree bark, open forests +
oblong-lanceolate;crispate +
2 cm20 mm <br />0.02 m <br /> (?) +
2-stratose +  and 1-stratose +
papillose +  and smooth +
autoicous +  and sexual +
Capsules mature Sep–Jun. +
Ann. Mag. Nat. Hist., ser. +
reddish-brown +
inconspicuous +
straight +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spheric +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Ptychomitrium incurvum +
Ptychomitrium +
species +
papillose +  and smooth +
divided +
slender +
plant +  and cespitose +