Pohlia wahlenbergii |
Pohlia cardotii |
|
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pale nodding-cap moss, pale pohlia, Wahlenberg's pohlia moss |
cardot's pohlia moss |
|
Habit | Plants small to very large, whitish or sometimes in large forms reddish, dull. | Plants medium-sized to large, green, sometimes red tinged, dull. |
Stems | 0.8–10 cm. |
0.4–2.5 cm. |
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. |
erect to ± spreading, ovate-lanceolate, 0.7–1.5 mm; margins strongly recurved, serrulate to serrate in distal 1/3; costa subpercurrent; distal medial laminal cells rhombic, 18–50 µm, walls thick, ± porose. |
Seta | orange-brown. |
orange-brown. |
Sexual condition | dioicous; perigonial leaves ovate; perichaetial leaves weakly differentiated, lanceolate. |
dioicous; perigonial leaves broadly short-ovate; perichaetial leaves weakly differentiated, elongate-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 0–20°, brown to stramineous, narrowly pyriform, neck 1/3 urn length; exothecial cells short-rectangular, walls sinuate; stomata superficial; annulus present; operculum bluntly to acutely conic; exostome teeth yellow to brown, narrowly triangular-acute; endostome hyaline, basal membrane scarcely exceeding capsule rim, segments narrow, weakly keeled, distinctly perforate, cilia absent to rudimentary. |
Spores | 15–21 µm, finely roughened. |
14–19 µm, finely roughened. |
Specialized | asexual reproduction absent. |
asexual reproduction absent. |
Pohlia wahlenbergii |
Pohlia cardotii |
|
Phenology | Capsules mature spring (Apr–Jun). | Capsules mature summer (Jun–Aug). |
Habitat | Disturbed clay or rarely sandy soil, path banks, along streams | Soil in mesic alpine and subalpine zones |
Elevation | low to high elevations | high elevations |
Distribution |
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
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AK; WA; BC; 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 cardotii is a rare alpine species characterized by dull green, relatively broad leaves with wide costae and recurved margins. The distal medial laminal cells of P. cardotii have more or less porose walls. The sporophytes are erect, with irregular exostome teeth, a low endostomial basal membrane, and narrow, slightly keeled, broadly perforate segments. This species sometimes forms deep turfs in moist alpine sites. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 28, p. 212. | FNA vol. 28, p. 202. |
Parent taxa | Mielichhoferiaceae > Pohlia | Mielichhoferiaceae > Pohlia |
Sibling taxa | ||
Synonyms | Hypnum wahlenbergii, Mniobryum wahlenbergii | Webera cardotii |
Name authority | (F. Weber & D. Mohr) A. L. Andrews: in A. J. Grout, Moss Fl. N. Amer. 2. 203. (1935) | (Renauld) Brotherus: in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 218[I,3]: 547. (1903) |
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