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Published In: Öfversigt af Förhandlingar: Kongl. Svenska Vetenskaps-Akademien 19(10): 606. 1862[1863]. (Öfvers. Förh. Kongl. Svenska Vetensk.-Akad.) Name publication detail

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Acceptance : Accepted
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In the absence of sporophytes, Plagiobryum zieri is likely to be confused with Bryum argenteum. In both species the leaves are erect-imbricate and their plants have a silvery appearance because the upper leaf cells lack chlorophyll above. Bryum argenteum is smaller than P. zieri in both plant and leaf size, and further differs in having more stiffly erect leaves, smaller (30–60 x 12–16 μm), more firm-walled leaf cells, and a costa ends below the apex.

Illustrations: Hedwig (1801, Pl. 44 1–5); Bruch and Schimper (1839, Pl. 341); Dixon and Jameson (1896, Pl. 42 J); Brotherus (1923 Fig. 46 E–G); Grout (1935, Pl. 83A); Nyholm (1958, Fig. 106 A); Abramova et al. (1961, Pl. 153 1–5); Lawton (1971, Pl. 97 19–25); Gangulee (1974, Fig. 458); Smith (1978, Fig. 182 1–4); Crum and Anderson (1981, Fig. 246); Ireland (1982, Pl. 167); Shaw (1982, Figs. 1–12); Orbán and Vajda (1983, Pl. 55 359); Magill (1987, Fig. 101 1–11); Noguchi (1988, Fig. 195B); Nyholm (1993, Fig. 130); Sharp et al. (1994, Fig. 381); Jóhannsson (1995, Fig. 29). Figure 160.
Habitat: On limestone; 3500 m.
Distribution in Central America: GUATEMALA. Huehuetenango: Williams et al. 41092 (FH, MO).
World Range: Subarctic America, Western and Eastern Canada, Northwestern and Northeastern U.S.A.; Central America; Northern, Middle, East, Southwestern, and Southeastern  Europe; Siberia, Russian Far East, Middle Asia, China, Eastern Asia, Caucasus, Western Asia; Northern and Southern Africa; Indian Subcontinent.


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Plagiobryum zieri (Hedw.) Lindb., Öfvers. Förh. Kongl. Svenska Vetensk.-Akad. 19: 606. 1862 [1863]. Bryum zierii Hedw., Sp. Musc. Frond. 182. 1801. Protologue: Scotland. Ad aggeres humidos in alpibus Scotiae.

Plants small, tufted, simple or sparsely branched, often with slender innovations; stems to 3 mm high, red; rhizoids reddish orange to brownish, roughened. Leaves crowded, 1–2 mm long, erect to imbricate, turgid to julaceous, soft, ovate to broadly ovate-lanceolate, not or weakly decurrent; apices acute; margins plane to irregularly and loosely recurved, entire to serrulate above; costae ending in the apex to percurrent; cells lax, thin-walled, upper cells hexagonal to rhomboidal 50–80 x 20–30 μm, marginal cells longer and narrower, basal cells short-rectangular, 40–60 x 12–24 μm. Dioicous. Perichaetial leaves lanceolate, upper cells linear-rhomboidal to elongate, firm-walled. Setae short, stout, curved, 6 mm long, reddish brown. Capsules horizontal to pendent, 4 mm long, strongly asymmetric, narrowly clavate, with a long, well-developed neck as long or longer than urn; stomata superficial; opercula low-conic, apiculate, 0.8 μm long; annuli revoluble, of 2–3 rows of cells; exostome teeth slender, reddish brown, striate-papillose below, whitish hyaline, smooth above, endostome reduced, whitish yellow, basal membrane _ the height of the exostome, segments slender, narrowly perforate, cilia rudimentary. Spores 30–36 μm, ellipsoid, coarsely papillose.



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