The major representation is for British Columbia and adjacent states of the United States: Alaska, Washington, Oregon, California and Arizona, in particular. Strong representation is also for the Atlantic provinces of Canada, largely through R.J. Belland. For Europe the Collection has modest holdings; for Australia and New Zealand the collections are representative, but not extensive. The same is true for Japan, Taiwan and the Hawaiian Islands. Lowest representation is for Africa and South America. Genera with most comprehensive representation are: Mosses; Andreaea, Grimmia, Hygrohypnum, Hypnum, Hylocomium, Isothecium, Philonotis, Racomitrium, Rhytidiadelphus, Sanionia, Schistidium, Sphagnum, Takakia, Tetraphis, Tetrodontium and Hepatics; Anastrophyllum, Diplophyllum, Gymnomitrion, Lophozia (s.l.), Marsupella, Plagiochila, Ptilidium, Scapania.