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BFNA Title: Plagiopus |
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Plagiopus –
Bartramiaceae 2. Plagiopus Brid., Bryol. Univ. 1: 596.
1826 * [Greek plagios, oblique, referrring
to curved seta + pus, foot] Plants in dense, dull olive green to brownish
tufts, radiculose below. Stems erect to ascending, forked, triangular
in cross section with a cortical layer of lax, thin-walled, hyaline cells;
central strand present. Leaves laxly erect or erect spreading and
somewhat curved when dry, erect spreading when moist, narrowly lanceolate,
acuminate, keeled above, not sheathing; margins revolute in distal half,
occasionally in distal 3/4, often 2-stratose and doubly serrate distally;
costa percurrent to short excurrent, prominent, rough on back; distal laminal
cells subquadrate or short-rectangular, thick-walled and faintly striated,
basal cells longer and thinner walled, especially toward costa. Specialized
asexual reproduction not known. Sexual condition synoicous;
perichaetial leaves scarcely distinct. Seta solitary, elongate, erect
or flexuose, smooth. Capsule suberect, subglobose, furrowed when dry,
small mouthed; annulus lacking; operculum small, low conic or convex; peristome
double, teeth reddish brown, smooth or minutely papillose, lanceolate with
intermediate thickenings on internal dorsal plates not paired with cross
walls on external dorsal plates; endostome yellowish to hyaline, basal
membrane well developed, segments broad, cilia short, rudimentary or lacking.
Spores ellipsoid, coarsely papillose. Species 1--2
(1 in the flora). Worldwide, except Antarctica. SELECTED REFERENCES Crum, H.A. and L.E. Anderson. 1981.
Mosses of Eastern North America. Vol. 1, p. 635, New York. Flowers, S. 1935. Plagiopus. In: A.J. Grout, ed., 1935.
Moss Flora of North America 2(3): 157. Newfane, Vermont. Ireland, R.R. 1982.
Moss Flora of the Maritime Provinces. National Museums of Canada, Natl. Mus.
Nat. Sciences, Publs. in Bot. 13. Ottawa. Lawton, E. 1971. Moss Flora of the
Pacific Northwest. Nichinan. Plagiopus is distinguished by its triangular
stems, striated leaf cells, and leaves appearing papillose in cross section. 1. Plagiopus oederianus
(Swartz) H. Crum &
L.E. Anderson, Mosses of E. No. Amer. 1: 636. 1981 Bartramia oederiana
Swartz (Schrader’s) J. Bot. 1800(2): 180. 1802 Plants small to moderately robust. Stems
2--10 cm. Leaves narrowly
lanceolate, acuminate, 2--3.5 mm; margins revolute nearly throughout; costa
serrulate on back above; distal laminal cells 9--22 × 7--8 µm, striate in longitudinal rows. Seta 7--18
mm. Spores ellipsoid, 20--26 µm. Capsules
mature June--Sept. Soil humus, seeps, rocks and crevices of cliffs, both
basic and acidic; 225--3900 m.; Greenland; Alta, B.C., N.B., Nfld., N.W.T.,
N.S., Nun., Ont., P.E.I., Que.; Alaska, Colo., Conn., Idaho, Iowa, Maine,
Mich., Minn., Mont., N.H., N.J., N.Y., Oreg., Pa., Vt., Va., Wash., Wis.; n
and c Europe, n and c Asia (China, Japan, Indonesia), Pacific Islands (Hawaii). |
