Pohlia cruda |
Pohlia atropurpurea |
|
---|---|---|
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 |
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
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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 | ||
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) |
Web links |