The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

pale nodding-cap moss, pale pohlia, Wahlenberg's pohlia moss

pohlia moss

Habit Plants small to very large, whitish or sometimes in large forms reddish, dull. Plants small, green to reddish, very glossy.
Stems

0.8–10 cm.

0.5–1.5 cm, cherry red.

Leaves

laxly spreading to more stiffly erect, lanceolate to ovate-lanceolate, 0.6–1.2 mm;

margins weakly to strongly serrulate in distal 1/3;

costa ending well before apex;

distal medial laminal cells laxly and broadly hexagonal to rhomboidal, 65–110 µm, walls thin.

stiffly erect and ± imbricate to erect-spreading, lanceolate, 0.6–1.3 mm;

base not or scarcely decurrent;

margins weakly serrulate in distal 1/3;

costa ending well before apex;

distal medial laminal cells broadly rhomboidal, 65–110 µm, walls thin.

Seta

orange-brown.

orange-brown.

Sexual condition

dioicous;

perigonial leaves ovate;

perichaetial leaves weakly differentiated, lanceolate.

dioicous;

perigonial leaves to 3 mm;

perichaetial leaves somewhat differentiated, lanceolate.

Capsule

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 immersed;

annulus absent;

operculum short- to long-conic;

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

endostome hyaline to yellow, basal membrane 1/2 exostome length or slightly longer, segments tapered apically, distinctly keeled, broadly perforate, cilia long, nodulose.

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 immersed;

annulus absent;

operculum short- to long-conic;

exostome teeth yellow to light brown, triangular-acute;

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

Spores

15–21 µm, finely roughened.

15–21 µm, finely roughened.

Specialized

asexual reproduction absent.

asexual reproduction absent.

Pohlia wahlenbergii

Pohlia vexans

Phenology Capsules mature spring (Apr–Jun). Capsules mature spring (Apr–Jun).
Habitat Disturbed clay or rarely sandy soil, path banks, along streams Disturbed clay or rarely sandy soil, path banks, along streams
Elevation low to high elevations low to moderate elevations
Distribution
from FNA
AK; AR; AZ; CA; CO; CT; DC; IA; ID; IL; KS; KY; LA; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; SD; TN; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; YT; Mexico; Central America; South America; Greenland; Eurasia; Antarctica
[WildflowerSearch map]
from FNA
AK; MT; WA; AB; BC; MB; NT; Europe
Discussion

Pohlia wahlenbergii is one of the most geographically widespread and common species of the genus. The leaves are pale whitish, decurrent, and have lax, thin-walled cells. The species varies greatly in size from very slender delicate plants in suboptimal habitats to large and deep cushions in cold high altitude and latitude sites. Large plants of P. wahlenbergii typically have red stems and sometimes reddish pigmentation to the leaves as well. Some authors refer large expressions to var. glaciale (or P. glaciale), but gradation in size and pigmentation is completely continuous, and different collectors draw the line between the typical variety and var. glaciale at different points. The exothecial cell walls in capsules of this species are somewhat collenchymatous.

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

Pohlia vexans is a slender species characterized by abundant, elongate sterile shoots with erect, rather glossy leaves. The exostome teeth are pale brown. The species is common on moist calcareous clays in cold continental regions of northwestern North America.

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

Source FNA vol. 28, p. 212. FNA vol. 28, p. 212.
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. 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. andalusica, P. andrewsii, P. annotina, P. atropurpurea, 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. wahlenbergii
Synonyms Hypnum wahlenbergii, Mniobryum wahlenbergii Mniobryum vexans
Name authority (F. Weber & D. Mohr) A. L. Andrews: in A. J. Grout, Moss Fl. N. Amer. 2. 203. (1935) (Limpricht) H. Lindberg: Acta Soc. Fauna Fl. Fenn. 16(5): 20. (1899)
Web links