Orthothecium W. P. Schimper in Bruch & W. P. Schimper, 1852.

Orthothecium chryseum is a plant primarily found in bogs and fens. No other local ecostate and pleurocarpous moss is so strongly plicate. It has not yet been found in California but should be looked for in rich fens.
see key to Hypnum Etc.

Species included:
Orthothecium chryseum (Schwägrichen in Schultes) W. P. Schimper in Bruch & W. P. Schimper, not known from CA