Mosses are fairly hard to identify, mostly because they are so small. This book is required reading if you want to ID mosses in California, mostly becMosses are fairly hard to identify, mostly because they are so small. This book is required reading if you want to ID mosses in California, mostly because there aren't many other image-based resources for moss identification, and keys can get pretty technical pretty quick. While this guide is not comprehensive, it will lead you in the right direction. My main caveats are a) not everything is photographed in situ (many photos are microscopic and/or of dried specimens), and b) there is no key to fall back on when you can't find a good match among the photos or leaf illustrations....more