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Moss China | Family List | Moss China V. 2 | Pottiaceae

12. Gymnostomum Nees & Hornsch., Bryologia Germanica. 1:153. 1823.


Plants perennial, small to rather large, in dense tufts, growth by annual renovation at the stem apices. Stems erect, simple, rarely branched; central strand present, weak. Leaves contorted when dry, erect-spreading when moist, oblong-elliptically lanceolate to narrowly lanceolate; margins plane, entire; costa stout, usually ending below the apex; upper leaf cells small, rounded quadrate to rounded hexagonal, densely papillose; basal cells irregularly rectangular, smooth, hyaline or pale yellowish. Dioicous. Perichaetial leaves somewhat sheathing at the base. Setae straight, slender; capsules erect, oblong-ovoid; peristome teeth absent; opercula conic-rostrate, with a long beak, deciduous or persistent with columella. Calyptrae cucullate. Spores yellowish brown, smooth or densely papillose.

1 Plants less than 10 mm high, blackish yellow-green; leaves oblong-elliptic to nearly ligulate   2 Gymnostomum calcareum
+ Plants 20-60 mm high, bright green; leaves lanceolate to ovate-lanceolate   (2)
2 (1) Leaf bases oblong; leaf cells moderately thick-walled, pluripapillose   1 Gymnostomum aeruginosum
+ Leaf bases ovate; leaf cells strongly thick-walled, smooth   3 Gymnostomum laxirete

Lower Taxa


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