Welcome to the Irene Creso Herbarium
The Irene Creso Herbarium serves primarily as a teaching resource for biology classes at Pacific Lutheran University, and is an untapped goldmine of taxonomic and distribution gems chiefly from Pierce, Chelan, Kitsap, and other western Washington counties.
In addition to a good representation of vascular plants, there are cabinets full of carefully labeled and dried mosses, liverworts, lichen and fungi. Of particular note is a moss collection for Mt. Rainier. The vascular plant collection also includes personal collections from former PLU faculty and friends from a Lutheran summer camp in Chelan Co, as well as Wenatchee and Kittitas in eastern WA. Another collection compiled by recently retired PLU botany professor John Main and others reflects a thorough baseline inventory of plants of Manchester State Park on the north Kitsap Penninsula. Other personal collections reflect former personal research projects (western Washington Poaceae), travels abroad (Malaysia), and closer to home (Arizona) for example. There is a nice collection of Washington coast red and brown algae; beautifully mounted and labeled as well. Reflecting Irene’s good connections in the botanical community, we also have a sizeable number of vascular plant duplicates from the UPS herbarium collection.