Pohlia cruda
Pohlia ludwigii
opal pohlia, opal thread-moss, pohlia moss
ludwig's pohlia moss, ludwig's thread-moss
0.5–2.5 cm.
0.8–3.5 cm.
erect to ± spreading, lanceolate to elliptic, 0.8–2 mm;
margins serrulate to serrate in distal 1/3;
costa subpercurrent;
distal medial laminal cells linear-rhomboidal, vermicular, firm, 70–140 µm, walls thin.
erect to ± spreading, lanceolate to broadly lanceolate, 1.2–2.4 mm;
base long-decurrent;
margins serrulate to serrate in distal 1/3;
costa subpercurrent;
distal medial laminal cells rhombic to rhomboidal, 40–80 µm, walls firm to thin.
orange to orange-brown.
orange-brown.
paroicous, rarely dioicous;
perigonial leaves in dioicous plants linear- or long-lanceolate from ovate base;
perichaetial leaves strongly or rarely weakly differentiated, linear-lanceolate.
dioicous;
perigonial leaves broadly short-ovate;
perichaetial leaves scarcely differentiated, broadly lanceolate.
inclined 10–135°, stramineous to orange-brown, long- and slender-pyriform, neck 1/2 urn length;
exothecial cells elongate-rectangular, walls straight;
stomata superficial;
annulus present;
operculum conic;
exostome teeth yellow-brown to red-brown, acute-triangular;
endostome hyaline, basal membrane 1/2 exostome length, segments broadly keeled, broadly perforate, cilia short to long.
inclined 90–180°, brown to stramineous, broadly pyriform, neck 1/3 urn length;
exothecial cells short-rectangular, walls weakly to moderately sinuate;
stomata superficial;
annulus present;
operculum bluntly conic;
exostome teeth yellow to brown, triangular-acute;
endostome hyaline, basal membrane to 1/2 exostome length, segments tapered apically, distinctly keeled, broadly perforate, cilia short to long.
18–26 µm, ± coarsely papillose.
14–21 µm, finely roughened.
asexual reproduction absent.
asexual reproduction absent.
Pohlia cruda
Pohlia ludwigii
Pohlia cruda is distinguished by the glossy, pale green to whitish or bluish leaves that are narrowly elliptic to lanceolate; the laminal cells are long and narrowly linear-vermicular; the perichaetial leaves are strongly differentiated and linear-lanceolate; the sporophytes have necks about as long as the urn, with long-tapered exostome teeth, broadly keeled and perforate segments, and short to long cilia. Along with P. nutans, P. cruda is one of the most common North American species of the genus. Unlike P. nutans, P. cruda is restricted to northern and montane sites where it grows in rock crevices and on soil banks. The leaves of this species are sometimes slightly complanate. The gametophytes can be unisexual (dioicous) or bisexual (paroicous).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Pohlia ludwigii is a rare alpine species, often found in habitats similar to those of P. obtusifolia and characterized by strongly decurrent leaves that are often slightly cucullate apically. The older lower leaves generally have a pink to reddish tinge. The leaf apices are acute to bluntly acute; the endostome segments are papillose; and the perichaetial leaf costae are very strong at their bases. In late snowmelt areas, P. ludwigii can form deep cushions when sterile.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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