Weissia brachycarpa

(Nees & Hornschuch) Juratzka

Laubm.-Fl. Oesterr.-Ung., 9. 1882,.

Basionym: Hymenostomum brachycarpum Nees & Hornschuch in C. G. D. Nees et al., Bryol. Germ. 1: 196, plate 12, fig. 3. 1823
Synonyms: Hymenostomum microstomum (Hedwig) R. Brown Hymenostomum microstomum var. brachycarpum (Nees & Hornschuch) Huebener
Treatment appears in FNA Volume 27. Treatment on page 515. Mentioned on page 513, 516, 517.

Leaves lanceolate to longlanceolate, base weakly differentiated to elliptic, shoulders weak or absent, distal laminal margins very broadly incurved to erect, apex broadly channeled, acute, mucro usually very strong, of 5–7 (–10) cells; costal adaxial stereid band smaller than the abaxial; distal laminal cells 8–12 µm wide. Sexual condition cladautoicous. Seta elongate, (0.2–) 0.28–0.4 cm. Capsule stegocarpic, ovoid, often slightly curved or bulging on one side, operculum differentiated, falling, peristome absent.


Phenology: Capsules mature spring.
Habitat: Soil, limestone rocks, grassy areas
Elevation: moderate elevations

Distribution

V27 740-distribution-map.gif

B.C., N.S., Ont., Ind., Mass., N.J., N.Y., N.C., Ohio, Tex., Eurasia, n Africa

Discussion

Weissia brachycarpa is a new name for the illegitimate combination Weissia microstoma (Hedwig) Müller Hal.

Weissia brachycarpa is easily distinguishable from related Weissia by the mostly plane (not tightly inrolled) distal leaf margins and usually a rather large mucro, composed of ca. 10 clear cells, but often only of 4–6 cells; other Weissia species have mucros of about six cells. Often the distal margins are sharply incurved (a sharp inflexion seen in section) and although the gametophyte has the appearance otherwise of Trichostomum crispulum, the largely plane (or broadly incurved) distal margins may be taken as a secondary character, perhaps a reduction. Weissia ludoviciana, likewise, has largely plane distal leaf margins, but inflexion may be evident in some specimens. In addition, the very long and narrow leaves of W. brachycarpa and W. ludoviciana are not duplicated in Trichostomum except in the T. tenuirostre complex. Weissia brachycarpa is cladautoicous, with perigonial buds borne in the axils of lower branches of robust fruiting plants. Weissia brachycarpa is related to W. rutilans of the Old World by the nearly identical gametophytes; the latter species differs in the rudimentary peristome teeth, and slightly larger spores. The nomenclature of W. brachycarpa is intricate; see discussions by M. O. Hill (1981) and T. J. Koponen et al. (1977).

Selected References

None.

Lower Taxa

None.
... more about "Weissia brachycarpa"
not differentiated +
long-excurrent +  and short-excurrent +
Acute (?) +  and Channeled (?) +
Richard H. Zander +
(Nees & Hornschuch) Juratzka +
crescent +
smaller +
rhomboid +  and rectangular +
papillose +  and smooth +
usually slightly wider +
rectangular;ovate +
differentiated +
Hymenostomum brachycarpum +
obovoid +
cucullate +
cleistocarpous +  and stegocarpous +
monoicous +, dioicous +  and sexual +
flat to bulging +
persistent +
5 (?) +  and 7 (?) +
elongate-rhomboid +  and elongate +
thicker +
tomentose +  and bare +
mucronate +
cladautoicous +  and sexual +
very broadly incurved +  and erect +
erect +  and incurved +
subquadrate;hexagonal +
B.C. +, N.S. +, Ont. +, Ind. +, Mass. +, N.J. +, N.Y. +, N.C. +, Ohio +, Tex. +, Eurasia +  and n Africa +
moderate elevations +
differentiated +
multicellular +
Soil, limestone rocks, grassy areas +
yellow +  and orange-red or red +
1 +  and 2 +
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 +
long-ligulate +
spiraled +  and contorted +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
lanceolate +
reduced +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
dentate +  and entire +
short-conic;short-rostrate +
differentiated +
photosynthetic +
2 +  and 6 +
dioicous +, monoicous +  and sexual +
spiculiform +  and 2-fid +
lateral +  and terminal +
lateral +  and terminal +
red +, orange +  and yellow +
oblong-truncate +  and long-triangular +
Capsules mature spring. +
Laubm.-Fl. Oesterr.-Ung., +
straight +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
elongate +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2 +  and 1 +
yellow +  and laminal +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Hymenostomum microstomum +  and Hymenostomum microstomum var. brachycarpum +
Weissia brachycarpa +
species +
elliptical;short-ovate or cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
semicircular +  and circular +
orange +  and yellow +
stemless +  and perigoniate +
brown;tan or yellow +
plant +  and cespitose +
occasionally smaller than the perichaetiate +