Rhytidium (Sullivant in A. Gray) Kindberg, 1882.

Rhytidium is a monotypic genus not yet found in California. It has a strangely discontinuous range throughout the world with the nearest locality being northwest Oregon. It is immediately recognizable in the field as a large pinnate moss mostly growing in erect plumes. Unlike other feather mosses (Rhytidiadelphus, Hylocomium) it has a strong single costa and the leaf laminae are obviously undulate whether wet or dry.
see key to Hylocomium Etc.

Species included:
Rhytidium rugosum (Hedwig) Kindberg, not known from CA