Orthotrichum laevigatum

J. E. Zetterstedt

Öfvers. Kongl. Vetensk.-Akad. Förh. 19: 363. 1862. 1862

Synonyms: Orthotrichum hainesiae Austin O. kingianum Lesquereux O. laevigatum var. kingianum (Lesquereux) Grout O. lonchothecium Austin O. macounii Austin O. macounii var. lonchothecium (Macoun & Kindberg) Grout O. raui Venturi O. roellii O. roellii subsp. schlotthaueri (Venturi) Kindberg O. roellii subsp. stenocarpum (Venturi) Kindberg O. schlotthaueri O. speciosum var. brevicaule Lesquereux O. speciosum var. hainesiae (Austin) Paris O. speciosum subsp. laevigatum (J. E. Zetterstedt) J. J. Amann O. speciosum var. polyanthum Lesquereux O. speciosum var. polycarpum Lesquereux & James O. speciosum var. raui (Austin) Lesquereux & James
Treatment appears in FNA Volume 28. Treatment on page 57. Mentioned on page 46, 56.

Plants (0.5–)2(–4.3) cm, light green to olive green. Stem leaves stiff, erect-appressed, slightly secund when dry, oblong-lanceolate, lanceolate, or ovate-lanceolate, 2–4.3 mm; margins revolute from base to near apex, entire; apex obtuse, bluntly or narrowly acute, or gradually acuminate; basal laminal cells rectangular to elongate, grading to elliptic-quadrate, walls thick, nodose; distal cells 8–12 µm, 1-stratose, papillae 1–3 per cell, conic or 2-fid, low. Specialized asexual reproduction absent. Sexual condition gonioautoicous. Seta 1.5–4 mm. Capsule fully exserted, cylindric, 1.4–2.6 mm, smooth or sometimes slightly plicate distally; exothecial cells homogeneous; stomata superficial; peristome double; prostome absent or rudimentary; exostome teeth 16, erect, papillose; endostome segments 8, occasionally rudimentary, usually absent in open capsules, of 1 row of cells, smooth. Calyptra conic-oblong, smooth, sparsely hairy, hairs finely papillose. Spores 10–15 µm.

Habitat: Non-calcareous boulders in mesic, open coniferous forests, base of deciduous trees
Elevation: moderate to high elevations (500-3000 m)


V28 76-distribution-map.gif

Alta., B.C., Man., N.W.T., Sask., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., Oreg., S.Dak., Utah, Wash., Wyo., Europe, e Asia (Japan).


Orthotrichum laevigatum is part of a complex group of intergrading taxa that generally are characterized by exserted, cylindric capsules with 16 erect or reflexed exostome teeth and a poorly developed endostome. Gametophytically, robust plants have stiff, erect leaves and large, blunt papillae. This complex is treated here as three species: O. holzingeri, a distinct, highly specialized species of seasonally wet rock with smooth exostome teeth, smooth laminal cells, smooth calyptra, and slightly ribbed capsule as distinguishing features; O. laevigatum, distinguished by smooth capsule and erect, papillose exostome teeth; and O. pylaisii, distinguished by slightly 8-ribbed capsule and reflexed-recurved exostome teeth.

Selected References


Lower Taxa


... more about "Orthotrichum laevigatum"
Dale H. Vitt +
J. E. Zetterstedt +
Alta. +, B.C. +, Man. +, N.W.T. +, Sask. +, Yukon +, Alaska +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wyo. +, Europe +  and e Asia (Japan). +
moderate to high elevations (500-3000 m) +
Non-calcareous boulders in mesic, open coniferous forests, base of deciduous trees +
Öfvers. Kongl. Vetensk.-Akad. Förh. +
Illustrated +
Orthotrichum hainesiae +, O. kingianum +, O. laevigatum var. kingianum +, O. lonchothecium +, O. macounii +, O. macounii var. lonchothecium +, O. raui +, O. roellii +, O. roellii subsp. schlotthaueri +, O. roellii subsp. stenocarpum +, O. schlotthaueri +, O. speciosum var. brevicaule +, O. speciosum var. hainesiae +, O. speciosum subsp. laevigatum +, O. speciosum var. polyanthum +, O. speciosum var. polycarpum +  and O. speciosum var. raui +
Orthotrichum laevigatum +
Orthotrichum +
species +