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FNA | Family List | FNA Vol. 27 | Grimmiaceae | Schistidium

16. Schistidium grandirete H. H. Blom, Bryophyt. Biblioth. 49: 50, fig. 7. 1996.

Plants in open, occasionally compact tufts, yellow-brown or dull red, often with yellowish or olivaceous tones. Stems 1.2-7 cm, central strand weak or absent. Leaves erect or slightly curved when dry, ovate-lanceolate, occa-sionally linear-lanceolate, keeled distally, 1.7-2.6 mm, 1-stratose; margins usually recurved to apex, smooth or weakly toothed, 2-stratose or 1-stratose in spots; apices acute; costa percurrent or short-excurrent as a smooth or weakly denticulate, occasionally decurrent awn, abaxial surface sometimes papillose; basal marginal cells short-rectangular or quadrate; distal cells mostly short-rectangular, 11-14 µm wide, strongly sinuose. Sexual condition autoicous. Capsule orange- or red-brown, short-cylindric or cupulate, 0.7-1.1 mm; exothecial cells usually isodiametric, quadrate or irregularly angular, usually mixed with a few elongate cells, thin-walled, trigonous; stomata present or absent; peristome patent to squarrose-recurved, often twisted, 330-530 µm, bright red, papillose, usually strongly perforated. Spores 15-21 µm, granulose or verruculose.

Capsules mature late spring to early summer. Rocks and on moist mineral soil; low to moderate elevations (0-600 m); Greenland; Nfld. and Labr. (Nfld.), N.W.T., Nunavut, Que.; Eurasia.

Schistidium grandirete is an arctic species characterized by a distinctive orange-brown or dull red color and large laminal cells. Differences between S. grandirete and the similar arctic species 18. S. holmenianum are discussed thereunder.


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