Rhytidiopsis Brotherus, 1908.

Rhytidiopsis is a monotypic genus endemic to western United States. So far it has been found only once in California. It grows on leaf litter in coniferous forests where it seems adapted to the compacting effects of a heavy winter snow cover. It appears in the field as a Rhytidiadelphus but the dense coating of paraphyllia on its stems and branches is obvious even with a hand-lens.
see key to Hylocomium Etc.

Species included:
Rhytidiopsis robusta (W. J. Hooker) Brotherus