Pohlia cruda |
Pohlia columbica |
|
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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 small to medium-sized, green to reddish, dull. |
Stems | 0.5–2.5 cm. |
0.4–1.5 cm, green to pale orange or pink. |
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, narrowly lanceolate to lanceolate, 1.2–2.5 mm; base not or scarcely decurrent; margins serrate in distal 1/3; costa subpercurrent; distal medial laminal cells linear-hexagonal, 85–150 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 ± differentiated, lanceolate to linear-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 145–180°, brown to 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 yellow-brown, triangular-acute; endostome hyaline, basal membrane 1/2 exostome length or slightly longer, segments tapered apically, distinctly keeled, broadly perforate, cilia long and nodulose, or short. |
Spores | 18–26 µm, ± coarsely papillose. |
13–18 µm, finely roughened. |
Specialized | asexual reproduction absent. |
asexual reproduction absent. |
Pohlia cruda |
Pohlia columbica |
|
Phenology | Capsules mature summer (Jun–Aug). | Capsules mature spring (May–Jul). |
Habitat | Soil banks, rock crevices, under roots, tundra soil and paths | Disturbed soil, along streams |
Elevation | moderate to high elevations | low elevations |
Distribution |
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
|
AK; WA; BC |
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 columbica is a very rare and poorly known species characterized by dull reddish plants, variably long-acuminate perigonial leaves, pale yellow-brown exostome teeth, and immersed stomata. The exothecial cell walls of capsules of this species are somewhat collenchymatous; the perichaetial leaves are 3 mm long. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 28, p. 198. | FNA vol. 28, p. 209. |
Parent taxa | Mielichhoferiaceae > Pohlia | Mielichhoferiaceae > Pohlia |
Sibling taxa | ||
Synonyms | Mnium crudum | Webera columbica |
Name authority | (Hedwig) Lindberg: Musc. Scand., 18. (1879) | (Kindberg) A. L. Andrews: in A. J. Grout, Moss Fl. N. Amer. 2: 202. (1935) |
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