North American Mycological Association

http://www.namyco.org/

Sonoma Mycological Association

SOMA has an excellent camp in late January. www.somamushrooms.org/

Humboldt Bay Mycological Society

http://hbmycologicalsociety.org

Mendocino Fungi Club (based inland)

https://www.facebook.com/mendofungi/

Bay Area Mycological Association

http://www.bayareamushrooms.org/

Mycological Society of San Francisco

http://www.mssf.org/

Fungus Federation of Santa Cruz

FFSC hosts two forays at JDSF each year. Become a member and join in the fun. http://ffsc.us/

Sacramento Area Mushrooms

http://sacmush.com/