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Family: Hypnaceae
[Breidleria arcuata (Mol.) Loeske, moreHypnum arcuatum Lindb., Hypnum arcuatum var. americanum Ren. & Card., Hypnum arcuatum var. demissum Schimp., Hypnum arcuatum var. elatum Schimp., Hypnum lindbergii var. americanum (Ren. & Card.) E. Whiteh., Hypnum lindbergii var. demissum (Schimp.) Loeske, Hypnum lindbergii var. elatum (Schimp.) Williams, Hypnum patientiae Lindb. ex Milde, Hypnum patientiae var. americanum (Ren. & Card.) Ren. & Card., Hypnum patientiae var. demissum (Schimp.) Jaeg., Hypnum patientiae var. elatum (Schimp.) Jaeg.] |
Plants: small to large, golden green, yellow-green, or pale green. Stems: 1â5 cm, reddish brown to yellowish green, brown with age, suberect to creeping, irregularly to sparsely branched to somewhat pinnate, branches 0.2â2 cm; hyalodermis present, central strand well developed; pseudoparaphyllia foliose. Leaves: falcate-secund (sometimes weakly so), oblong-ovate, not or slightly rounded to insertion, tapering gradually to apex, 0.5â2 à 0.5â1 mm; base decurrent; margins plane, entire to bluntly serrate especially in apex; acumen slender or broad; costa double, short; alar cells abruptly enlarged, region well defined, in 2â4 rows along margins, outermost cell walls thinner; basal laminal cells wider, shorter than medial cells, yellowish, walls porose; medial cells 60â100 à 5â6 µm. Sexual: condition dioicous; inner perichaetial leaves oblong-lanceolate, margins serrulate at apex, apex attenuate, costa obscure. Seta: reddish, 2.5â4 cm. Capsule: inclined, pale brown, cylindric, 2â3 mm; annulus 2- or 3-seriate; operculum conic-convex; endostome cilia 2â4. Phenology: Capsules mature JunâAug. Habitat: Terrestrial, open sites, wet soil, humus, logs, sandy lake and river margins, swamp forests Elevation: low to high elevations (0-3000 m) Distribution: Greenland, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Ill., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Europe, Asia.
Discussion: Hypnum lindbergii is a species largely of temperate climates, most frequent in boreal and warm temperate regions, less frequent in the Arctic, occurring from sea level to alpine elevations; sporophytes are infrequently produced in spring and summer. Plants of H. lindbergii have few or no rhizoids; the supra-alar cells are shorter than the alar cells, in 1â3 rows; the capsules are furrowed when dry; and the endostome cilia are as long as the segments. The hyalodermis cortical cells, leaves usually curved to insertion, usually well-defined alar regions of swollen thin-walled cells, and often wide acute apex of many stem leaves usually separate this species from similar taxa. Hypnum pratense resembles H. lindbergii somewhat, but H. pratense tends to be very glossy, with stem leaves often complanate, and thin-walled alar cells absent.
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