Species description:
Species name referring to the triangular leaves and the occasional three-rowed arrangement of the uppermost leaves of some stems.

Comments:
Commonly called the rough neck moss or shaggy moss because of the untidy leaves at the shoot tips. A whimsical name, electri­fied cat tail moss, has gained some popularity in British Columbia.

Distinguishing characteristics:
The very coarse, pale yellow-green plants with usually untidy divergent leaves of the main stem tip and upper branches, the strongly pleated, somewhat wrinkled leaves and the two strong midribs serve as useful characters. This species is more tolerant of drier climates than the other species of Rhytidiadelphus.

Habit:
Forming pale yellow-green, loose mats of coarse, interwoven, suberect, branched shoots in which the strongly divergent leaves form bristly, untidy shoot tips.

Similar Species:
Rhytidiopsis robusta is of a similar size but the leaves are wrinkled, lack pleats and show a strong tendency to be falcate-­secund. Plants tend to be golden yellow-green to brownish, rather than pale yellow-green. Antitrichia curtipendula is superficially similar but the leaf shape differs, pleats are lacking and a radiating series of costae is usually apparent (see notes under Antitrichia).

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  Some Common Mosses of BC

Synonyms and Alternate Names:
Rhytidiadelphus triquetrus var. beringianus (Cardot & Thér.) Grout