Abstract
The purpose of this paper is to bring up to date the available information on the distribution of pteridophytes. The last comprehensive treatment of this subject was by Parish (Fern Bull. 12: 1-15. 1904),in a discussion of the fern flora of California. As his paper dealt with the whole state, distribution for the southern part was not given as definitely as might be wished; furthermore much additional information has accumulated in recent years and has made it seem desirable that there be made a critical restatement of the whole subject. This paper is the outcome of special study of the literature; of comprehensive herbarium-work, in which all the important herbaria of the state were examined; and finally, of several years collecting in practically all parts of California. As here used, Southern California is, as generally understood, those counties east and south of Santa Barbara County and the desert portion of Kern County south of the Tehachepi Mountains. Included in the range also are the Channel Islands which lie just off
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