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

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

0.8–10 cm.


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.



Sexual condition


perigonial leaves ovate;

perichaetial leaves weakly differentiated, lanceolate.


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.


15–21 µm, finely roughened.


asexual reproduction absent.

Pohlia wahlenbergii

Phenology Capsules mature spring (Apr–Jun).
Habitat Disturbed clay or rarely sandy soil, path banks, along streams
Elevation low to high elevations
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]

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.)

Source FNA vol. 28, p. 212.
Parent taxa 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
Synonyms Hypnum wahlenbergii, Mniobryum wahlenbergii
Name authority (F. Weber & D. Mohr) A. L. Andrews: in A. J. Grout, Moss Fl. N. Amer. 2. 203. (1935)
Web links