Schistidium maritimum

Plants in tufts, olivaceous, often brownish. Stems 0.8–5 cm, central strand absent. Leaves usually curved, sometimes erect, often somewhat contorted when dry, ovate-lanceolate to linear-lanceolate, keeled, (1.2–)1.5–2.6(–4) mm, usually 2-stratose distally; margins usually plane distally, recurved proximally, smooth or papillose, 2-stratose or 3-stratose, rarely 4-stratose distally; apices acute or blunt, sometimes ending in a short, fleshy, multistratose apiculus; costa percurrent, rarely excurrent as a short denticulate awn, with guide cells and one or two stereid bands, abaxial surface usually slightly papillose; basal marginal cells quadrate or short-rectangular, often trigonous; distal laminal cells isodiametric, rounded or angular, sometimes short-rectangular, 7–11 µm wide, smooth or weakly papillose, sometimes weakly bulging-mammillose, straight or slightly sinuose. Sexual condition autoicous. Capsule dark reddish brown or dark brown, ovoid, cupulate, or campanulate, 0.6–1.3 mm; exothecial cells usually angular, isodiametric, occasionally elongate, thick-walled; stomata present; peristome patent to revolute, 200–500 µm, red, papillose, often strongly perforated. Spores 15–30 µm, granulose.

Phenology: Capsules mature late spring to early summer.
Habitat: Rocks within or near the spray zone along coasts
Elevation: low elevations (0-20 m)

Greenland, B.C., N.B., Nfld. and Labr. (Nfld.), N.S., P.E.I., Que., Alaska, Calif., Maine, Mass., Oreg., Wash., Eurasia.

Discussion

Schistidium maritimum is one of the easiest species of the genus to identify. Its usually 2-stratose distal laminae, well developed stereid bands, usually small and often campanulate capsules, and coastal habitat are distinctive. Subspecies piliferum, characterized by the presence of awns and a single stereid layer, is not recognized here; further study is needed.

Selected References

None.

Lower Taxa