Pohlia cruda
Pohlia filum
opal pohlia, opal thread-moss, pohlia moss
fat-bud pohlia, fat-bud thread-moss, pohlia moss
0.5–2.5 cm.
0.5–4 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, lanceolate, 0.6–1.2 mm;
margins serrulate to serrate in distal 1/3;
costa subpercurrent;
distal medial laminal cells rhombic to rhomboidal, 35–95 µm, walls 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 ovate;
perichaetial leaves scarcely differentiated, 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 95–180°, brown to stramineous, pyriform, neck 1/3 urn length;
exothecial cells short-rectangular, walls sinuate;
stomata superficial;
annulus present;
operculum convex-conic;
exostome teeth yellow-brown, narrowly triangular-acute;
endostome hyaline, basal membrane 1/2 exostome length, segments distinctly keeled, broadly perforate, cilia short to rudimentary.
18–26 µm, ± coarsely papillose.
16–23 µm, finely roughened.
asexual reproduction absent.
asexual reproduction usually present when sterile;
axillary gemmae 1 (or 2), bulbiform, oblong or elliptic to subglobose, green to yellow, black when old, leaf primordia restricted to apex or rarely 1 or 2 proximally, laminate, small, stiff.
Pohlia cruda
Pohlia filum
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 filum is an easily recognized species characterized by erect, somewhat glossy leaves, and ovoid gemmae that normally arise singly in the leaf axils. The gemmae have a few small, triangular, rather stiff leaf primordia at the apex, rarely with one or two primordia proximal on the gemma body. The gemmae of P. drummondii are more elongate-cylindric and branchlike, with larger, flexuose, often green leaf primordia at the apex and also frequently more proximally on the gemma body.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
BC
CalFlora
Flora NW
MD Biodiversity
MI Flora
MN Wildflowers
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
