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opal pohlia, opal thread-moss, pohlia moss

pohlia moss

Habit Plants medium-sized to large, green, whitish, or sometimes bluish tinged, shiny. Plants very small, green to reddish, shiny.
Stems

0.5–2.5 cm.

0.2–0.4 cm.

Leaves

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-spreading to spreading, lanceolate, 0.6–1.2 mm;

base not or scarcely decurrent;

margins weakly serrulate in distal 1/3;

costa ending well before apex;

distal medial laminal cells laxly and broadly rhomboidal, 65–110 × 10–12 µm, walls thin.

Seta

orange to orange-brown.

orange-brown.

Sexual condition

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 to 3 mm;

perichaetial leaves scarcely differentiated, lanceolate.

Capsule

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 ± 180°, brown to red-brown, sometimes stramineous, short-pyriform to urceolate, neck less than 1/3 urn length;

exothecial cells isodiametric, walls sinuate;

stomata superficial;

annulus absent;

operculum short- to long-conic;

exostome teeth dark brown to red-brown, triangular-acute;

endostome yellow to yellow-brown, basal membrane 1/2 exostome length, segments tapered apically, distinctly keeled, broadly perforate, cilia long, nodulose.

Spores

18–26 µm, ± coarsely papillose.

15–21 µm, finely roughened.

Specialized

asexual reproduction absent.

asexual reproduction absent.

Pohlia cruda

Pohlia atropurpurea

Phenology Capsules mature summer (Jun–Aug). Capsules mature spring (Apr–Jun).
Habitat Soil banks, rock crevices, under roots, tundra soil and paths Disturbed clay or rarely sandy soil, path banks, along streams
Elevation moderate to high elevations low elevations
Distribution
from FNA
AK; AZ; CA; CO; IA; ID; MA; MD; ME; MI; MN; MT; NC; NE; NJ; NM; NV; NY; OR; PA; SD; TN; UT; VA; VT; WA; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; QC; SK; YT; Mexico; South America; Australia; Greenland; Pacific Islands; Eurasia; Antarctica
[WildflowerSearch map]
from FNA
AK; CA; IA; ID; MN; NY; WA; BC; MB; NL; ON; YT; Europe
Discussion

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 atropurpurea has sporophytes similar to those of P. melanodon, with dark reddish brown exostome teeth, yellow endostomes, and immersed stomata. This uncommon northern species is very small and soft, generally consisting of unbranched gametophytes that do not form extensive cushions. As in P. melanodon, the laminal cells are lax and thin-walled. Genetic relationships between this species and P. melanodon need study; P. atropurpurea could be a northern form of that species. Medial laminal cells of the perichaetial leaves are narrower than the broadly lax cells of proximal stem leaves. The exothecial cell walls of capsules of this species are somewhat collenchymatous.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 28, p. 198. FNA vol. 28, p. 211.
Parent taxa Mielichhoferiaceae > Pohlia Mielichhoferiaceae > Pohlia
Sibling taxa
P. andalusica, P. andrewsii, P. annotina, P. atropurpurea, P. beringiensis, P. bolanderi, P. brevinervis, P. bulbifera, P. camptotrachela, P. cardotii, P. columbica, P. crudoides, P. drummondii, P. elongata, P. erecta, P. filum, P. flexuosa, P. lescuriana, P. longibracteata, P. longicolla, P. ludwigii, P. melanodon, P. nutans, P. obtusifolia, P. pacifica, P. proligera, P. rabunbaldensis, P. robertsonii, P. tundrae, P. vexans, P. wahlenbergii
P. andalusica, P. andrewsii, P. annotina, P. beringiensis, P. bolanderi, P. brevinervis, P. bulbifera, P. camptotrachela, P. cardotii, P. columbica, P. cruda, P. crudoides, P. drummondii, P. elongata, P. erecta, P. filum, P. flexuosa, P. lescuriana, P. longibracteata, P. longicolla, P. ludwigii, P. melanodon, P. nutans, P. obtusifolia, P. pacifica, P. proligera, P. rabunbaldensis, P. robertsonii, P. tundrae, P. vexans, P. wahlenbergii
Synonyms Mnium crudum Bryum pulchellum var. atropurpureum
Name authority (Hedwig) Lindberg: Musc. Scand., 18. (1879) (Wahlenberg) H. Lindberg: Acta Soc. Fauna Fl. Fenn. 16(5): 14. (1899)
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