Sematophyllum demissum

(Wilson) Mitten

J. Linn. Soc., Bot. 8: 5. 1864.

Endemic
Basionym: Hypnum demissum Wilson in J. E. Smith et al., Engl. Bot., suppl. 2: plate 2740. 1832
Synonyms: H. carolinianum Müller Hal. Sematophyllum carolinianum (Müller Hal.) E. Britton
Treatment appears in FNA Volume 28. Treatment on page 574.
Revision as of 06:53, 30 July 2020 by imported>Volume Importer
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Plants small to medium-sized, green to yellow-green, glossy. Stems 0.5–2.5 cm, branches sometimes ascending. Leaves straight or occasionally homomallous, oblong-ovate, tapering gradually to apex, 1–1.2 mm; margins reflexed proximally; apex acute; alar cells enlarged, inflated, yellow, in 1 row, supra-alar cells few, quadrate to short; laminal cells rhombic to flexuose. Specialized asexual reproduction absent. Seta 0.8–1.2 cm. Capsule inclined to horizontal, 1 mm.


Phenology: Capsules mature summer.
Habitat: Wet siliceous rock near streams
Elevation: low to moderate elevations

Distribution

V28 896-distribution-map.gif

N.S., Ala., Ark., Conn., Fla., Ga., Iowa, Kans., La., Mich., Mo., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn.

Discussion

Sematophyllum demissum resembles Hageniella micans in many respects, but H. micans is distinguished by its strong double costa and toothed acumen. Also, exothecial cells of Sematophyllum are collenchymatous; those of Hageniella are not.

Selected References

None.

Lower Taxa

None.
... more about "Sematophyllum demissum"
Wilfred B. Schofield† +
(Wilson) Mitten +
Hypnum demissum +
cucullate +
inclined +  and horizontal +
short-cylindric +
1 cm10 mm <br />0.01 m <br /> (?) +
specialized +
autoicous +, dioicous +, synoicous +  and sexual +
quadrate +  and inflated +
enlarged +
differentiated +
N.S. +, Ala. +, Ark. +, Conn. +, Fla. +, Ga. +, Iowa +, Kans. +, La. +, Mich. +, Mo. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +  and Tenn. +
low to moderate elevations +
Wet siliceous rock near streams +
papillose +  and smooth +
falcate-secund +
occasionally +  and straight +
erect-spreading +
tapering;oblong-ovate +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
small;large +
Capsules mature summer. +
J. Linn. Soc., Bot. +
light-brown +, red +  and reddish-brown +
elongate +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
falcate-secund +
widespreading +  and erect-spreading +
tapering;lanceolate;broadly ovate +
branched +  and not complanate-foliate +
redbrown +  and reddish green +
arching +, erect +, sometimes +  and reclining +
0.5 cm5 mm <br />0.005 m <br /> (?) +  and 2.5 cm25 mm <br />0.025 m <br /> (?) +
H. carolinianum +  and Sematophyllum carolinianum +
Sematophyllum demissum +
Sematophyllum +
species +
green;yellow-green +
small +  and medium-sized +