Orthotrichum affine |
Orthotrichum pellucidum |
|
---|---|---|
orthotrichum moss, wood bristle-moss |
xerophytic limestone moss |
|
Habit | Plants to 3 cm. | Plants to 2.5 cm, appearing glaucous. |
Stem | leaves erect-appressed and straight when dry, ligulate, elongate- to ovate-lanceolate, 2–4 mm; margins recurved-revolute to just below apex, entire; apex acute; basal laminal cells long-rectangular to elongate, walls thick, nodose; distal cells 9–13 µm, 1-stratose, papillae 2 or 3 per cell, 2-fid, low. |
leaves stiff, closely erect-appressed, incurved when dry, oblong-lanceolate or lanceolate, 2–2.7 mm; margins recurved proximally, reflexed distally, entire; apex blunt or obtuse; basal laminal cells short-rectangular to quadrate, grading to subquadrate at margin, walls thin, not nodose; distal cells 6–11 µm, 1-stratose, papillae 1–3 per cell, conic or 2-fid, large. |
Seta | 1–2.2 mm. |
1–1.5 mm. |
Sexual condition | gonioautoicous. |
gonioautoicous. |
Capsule | 1/2 emergent to short-exserted, long-cylindric when mature, cylindric and constricted along entire length when old and dry, 1.6–2.5 mm, strongly 8-ribbed 2/3 capsule length; stomata superficial; peristome double; prostome absent; exostome teeth 8, erect when mature, reflexed to reflexed-recurved when old, coarsely and obscurely papillose or sometimes papillose-reticulate, deeply perforate, cancellate; endostome segments 8, rarely 16, well developed, usually present when capsule is old and dry, narrow, of 2 rows of cells, papillose. |
1/2 emergent to short-exserted, oblong-ovate to ovate when mature, oblong to short-oblong when old and dry, 1.2–1.9 mm, strongly 8-ribbed entire length, rarely 16-ribbed with 8 short intermediate ribs, constricted below mouth when dry; stomata immersed; peristome single; prostome rudimentary; exostome teeth usually 16 when mature, irregularly split, often absent when capsule is old, erect or spreading, papillose-striate to coarsely reticulate-papillose; endostome segments absent. |
Calyptra | conic-oblong, smooth, hairs few, papillose. |
oblong, smooth, hairy, hairs papillose. |
Spores | 15–18 µm. |
10–15 µm. |
Specialized | asexual reproduction absent. |
asexual reproduction absent. |
Orthotrichum affine |
Orthotrichum pellucidum |
|
Habitat | Deciduous trees, shaded rock, shaded forests near stream beds, canyons, mountains | Calcareous or siliceous boulders, cliff faces in xeric areas, direct sunlight |
Elevation | low to high elevations (0-3000 m) (low to high elevations (0-9800 ft)) | moderate to high elevations (500- 3000 m) (moderate to high elevations (1600- 9800 ft)) |
Distribution |
CA; CO; ID; MT; OR; UT; WA; AB; BC; Europe; Asia; n Africa
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; SD; UT; WY; AB; BC; MB; NT; NU; YT; Greenland; n Europe |
Discussion | Orthotrichum affine, a species confined to western North America in the flora area, is best recognized by: superficial stomata; cylindric, strongly ribbed, almost exserted capsules; a well-developed but not stout endostome; and a calyptra that is only sparsely hairy. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Orthotrichum pellucidum is distinguished by its blunt, lanceolate-oblong leaves that always appear glaucous because of the large 2-fid papillae of the distal laminal cells. When the plants are fertile, which is usually the case, the short-exserted, oblong-ovate, 8-ribbed capsules identify O. pellucidum. The capsule has stomata in the proximal to mid capsule, more or less covered by projecting subsidiary cells. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 28, p. 50. | FNA vol. 28, p. 62. |
Parent taxa | Orthotrichaceae > Orthotrichum | Orthotrichaceae > Orthotrichum |
Sibling taxa | ||
Synonyms | O. cupulatum var. jamesianum, O. jamesianum | |
Name authority | Schrader ex Bridel: Muscol. Recent. 2(2): 22. (1801) | Lindberg: Öfvers. Kongl. Vetensk.-Akad. Förh. 23: 549. (1867) |
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