From the California Botanical Society: Special Issue of Madroño—Bryoflora of California:
Contributions toward a bryoflora of California III. Keys and annotated species catalogue for liverworts and hornworts by William T. Doyle & Raymond E. Stotler. Madroño 53(2): 89-197.  2006.

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Contributions toward a bryoflora of California III.
Keys and annotated species catalogue for liverworts and hornworts

"Part III is similar to the catalogue and key to the mosses; however, this work has the added feature of diagnostic narratives to separate species beyond the use of the keys. The work provides keys and identification narratives for the 150 liverworts and hornworts documented for California. Although written for California, it will be extremely useful for Nevada and southern Oregon. There are no liverworts or hornworts known from Nevada that are not in this work."

This publication (along with the previously published catalogue and keys of
California mosses by Norris & Shevock [Madrono 51(1&2), 2004]) is available
for $15 USD each (includes postage worldwide).
Credit cards orders are accepted.

For order information of for this (and the moss treatments) go to:

  http://www.calbotsoc.org/madrono/bryoflora.html