Brachelyma

Schimper ex Cardot

Mém. Soc. Sci. Nat. Math. Cherbourg 28: 37, 130. 1892.

Endemic
Etymology: Greek brachys, short, and elyma, veil, alluding to diminutive calyptra
Treatment appears in FNA Volume 28. Treatment on page 490. Mentioned on page 489, 655.
 TaxonIllustrator 
FontBrachelymaSubulatum.jpegBrachelyma subulatumPatricia M. Eckel

Plants small to medium-sized, dull. Stems prostrate or pendent; rhizoids from clusters of initials abaxial to leaf insertions, not or weakly branched; axillary hairs 240–360 µm. Leaves distant proximally, crowded distally, oblong-lanceolate to lanceolate, keeled, conduplicate; margins sometimes narrowly reflexed, entire or serrulate proximally, serrulate to serrate at apex; apex obtuse to acute; costa subpercurrent to percurrent; alar cells quadrate or rectangular, slightly enlarged, walls firm; medial laminal cells rhomboidal, linear-rhomboidal, or elongate. Perigonia lateral in leaf-axils. Perichaetia with leaves elongate, sheathing setae. Seta 0.7–1.5 mm. Capsule immersed, oblong-cylindric to oval; annulus massive; operculum long-conic or occasionally obliquely rostrate; endostome trellis imperfect. Calyptra cucullate, covering only operculum. Spores 13–18 µm.

Distribution

c, se United States

Discussion

Species 1.

Brachelyma is semi-aquatic; as with many semi-aquatic mosses, the plants can be slender to almost robust. Distinctive features include long, narrow, keeled-conduplicate, sometimes obscurely bordered leaves; strong, single costae; firm-walled, non-bulging alar cells; serrate to serrulate distal leaf margins; often rhomboidal distal laminal cells; long, sheathing perichaetial leaves, and short setae with completely immersed capsules. Curiously, the surface cells of the setae are quadrate to oblate; the result of simple cell elongation in these cells would give the Brachelyma setae the same length as the Dichelyma setae, as well as immersed or exserted capsules.

Selected References

None.

... more about "Brachelyma"
obtuse;acute +
Bruce Allen +
Schimper ex Cardot +
decurrent +
cucullate +
oblong-cylindric +  and oval +
rectangular +  and quadrate +
enlarged +
subpercurrent +
c +  and se United States +
red;brownish orange +
Greek brachys, short, and elyma, veil, alluding to diminutive calyptra +
spiculose-papillose +, papillose +  and smooth +
crowded +  and distant +
elongate +, keeled +, oblong-lanceolate +  and lanceolate +
serrulate +  and serrate +
dioicous +  and sexual +
elongate;linear-rhomboidal;elongate;linear-rhomboidal;rhomboidal +
rostrate +  and long-conic +
Mém. Soc. Sci. Nat. Math. Cherbourg +
trailing +, pendent +  and prostrate +
elongate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
large +  and small +
pendent +  and prostrate +
Brachelyma +
Fontinalaceae +
small;medium-sized +