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orthotrichum moss, rock bristle-moss

Habit Plants (1–)3–12.5 cm, light green to olive green. Plants to 3 cm, red-brown to black.
Stem

leaves stiff, erect-appressed when dry, narrowly lanceolate to ovate-lanceolate, 2–4.5 mm;

margins recurved to narrowly revolute to near apex, entire;

apex sharply to slenderly acute;

basal laminal cells elongate to rectangular, walls thick, ± nodose;

distal cells 6–13 µm, 1-stratose, papillae 1 or 2 per cell, conic and small, or 2-fid and low.

leaves erect-appressed when dry, oblong-lanceolate to ovate-lanceolate, 2.5–4 mm;

margins recurved-revolute to near apex, entire or sometimes irregularly serrulate near apex;

apex obtuse, cucullate;

basal laminal cells short-rectangular, walls thin, somewhat nodose;

distal cells to 20 µm, 1-stratose, smooth or papillae 1 or 2 per cell, conic, low.

Seta

to 1.8 mm.

to 1.5 mm.

Sexual condition

gonioautoicous.

gonioautoicous.

Capsule

immersed, emergent, or slightly exserted, usually 1/3 emergent, globose ovate, ovate-oblong, or short-oblong, 1.3–1.8 mm, slightly or distinctly 8-ribbed 1/2–2/3 length;

stomata superficial;

peristome single, rarely double;

prostome large, conspicuous, or rudimentary;

exostome teeth 16, erect or sometimes spreading-recurved when old, smooth, scattered-papillose, or coarsely papillose-granulate;

endostome segments absent, or rarely 8, rudimentary, of 1 row of cells, smooth or roughened.

immersed, oblong to oblong-ovate, 1.5–2 mm, strongly 8-ribbed entire length;

stomata immersed;

peristome double;

prostome sometimes present, low;

exostome teeth 8 splitting to 16, erect, loosely reflexed when old, densely papillose-striate;

endostome segments (8–)16, well developed, of 1 or 2 rows of cells, finely papillose.

Calyptra

oblong, smooth, hairy or rarely naked, hairs finely papillose.

conic-oblong, papillose, naked.

Spores

13–21 µm.

to 15 µm.

Specialized

asexual reproduction absent.

asexual reproduction absent.

Orthotrichum rupestre

Orthotrichum euryphyllum

Habitat Non-calcareous boulders and cliff faces in mesic areas of pine, spruce-fir, or aspen forests, base of trees, subalpine shade Calcareous springs in Artemisia scrub
Elevation low to high elevations (100-3000 m) (low to high elevations (300-9800 ft)) low to moderate elevations (0-500 m) (low to moderate elevations (0-1600 ft))
Distribution
from FNA
AK; AZ; CA; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; NT; NU; ON; YT; South America; e Africa; Pacific Islands (New Zealand); Atlantic Islands (Canary Islands); Greenland; n Africa; e Asia (Japan); Europe; Australia
[WildflowerSearch map]
from FNA
CA; OR; WA
Discussion

In typical form, Orthotrichum rupestre is characterized as much-branched plants in loose tufts with lanceolate leaves, apex narrowly and bluntly acute, basal cells elongate, thick-walled, and nodose, yellowish in older leaves, capsule oblong, emergent, 8-ribbed to mid capsule when old and dry, smooth or slightly 8-ribbed when mature, exostome of 16 erect teeth, coarsely papillose, and calyptra with abundant, spinulose, papillose hairs, some of which extend over the beak.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Plants of Orthotrichum euryphyllum are compact and red-brown with cucullate, entire leaf apices and distal laminal cells approaching 20 µm wide. In comparison, plants of O. rivulare are loose and blackish with flat, dentate leaf apices and distal laminal cells rarely wider than 13 µm. The leaf apices of O. euryphyllum are reflexed when dry; the stomata are found in the proximal portion of the capsule, covered by subsidiary cells.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 28, p. 65. FNA vol. 28, p. 54.
Parent taxa Orthotrichaceae > Orthotrichum Orthotrichaceae > Orthotrichum
Sibling taxa
O. affine, O. alpestre, O. anodon, O. anomalum, O. bartramii, O. bolanderi, O. consimile, O. cupulatum, O. diaphanum, O. elegans, O. euryphyllum, O. exiguum, O. fenestratum, O. flowersii, O. gymnostomum, O. hallii, O. holzingeri, O. keeverae, O. kellmanii, O. laevigatum, O. lescurii, O. lyellii, O. norrisii, O. obtusifolium, O. ohioense, O. pallens, O. parvulum, O. pellucidum, O. praemorsum, O. pulchellum, O. pumilum, O. pusillum, O. pycnophyllum, O. pylaisii, O. rivulare, O. shawii, O. shevockii, O. sordidum, O. speciosum, O. spjutii, O. stellatum, O. stramineum, O. strangulatum, O. striatum, O. tenellum, O. underwoodii
O. affine, O. alpestre, O. anodon, O. anomalum, O. bartramii, O. bolanderi, O. consimile, O. cupulatum, O. diaphanum, O. elegans, O. exiguum, O. fenestratum, O. flowersii, O. gymnostomum, O. hallii, O. holzingeri, O. keeverae, O. kellmanii, O. laevigatum, O. lescurii, O. lyellii, O. norrisii, O. obtusifolium, O. ohioense, O. pallens, O. parvulum, O. pellucidum, O. praemorsum, O. pulchellum, O. pumilum, O. pusillum, O. pycnophyllum, O. pylaisii, O. rivulare, O. rupestre, O. shawii, O. shevockii, O. sordidum, O. speciosum, O. spjutii, O. stellatum, O. stramineum, O. strangulatum, O. striatum, O. tenellum, O. underwoodii
Synonyms Dorcadion rupestre, O. bullatum, O. californicum, O. douglasii, O. macfaddenae, O. rupestre var. globosum, O. rupestre var. macfaddenae, O. texanum, O. texanum var. globosum O. epapillosum
Name authority Schleicher ex Schwagrichen: Sp. Musc. Frond. Suppl. 1(2): 27, plate 53 [top]. (1816) Venturi: Bot. Centralbl. 44: 417. (1890)
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