PROCEEDINGS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. XII, No. 2, pp. 27^269. May 15, 1910. 



THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA, 



CALIFORNIA.* 



By Albert W. C. T. Herre. 



Wer hat je die Flechten, wer hat die Moose gezahlet, 

 Deren Friihling beginnt, wen Froste den Herbst entblattern, 

 Deren iippiger Wuchs die Scheitel atherischer Alpen 

 Da, wo sie Flora verlast, mit Tausend Farben bekleidet? 



J. G. Herder. 



The present paper is a synopsis of the author's studies of the syste- 

 matic limitations and relationships of the lichens of the Santa Cruz 

 Peninsula of California. 



As already explained in earlier papers (Proc. Wash. Acad. Sci., 

 vol. vii, p. 325, et seq., and Botanical Gazette, vol. xliii, pp. 267- 

 273), the Santa Cruz Peninsula forms a natural biological region, and 

 as such naturally commends itself to the study of the naturalist 

 interested in geographical distribution. 



The region here treated is a roughly triangular area lying west 

 of San Francisco Bay and the broad, originally treeless Santa Clara- 

 San Benito valleys, and north of Monterey Bay and the Pajaro river. 

 Rising from sea level along most of its border, its surface is greatly 

 broken by a spur of the Coast Range, the Santa Cruz mountains, 

 which rise at their highest point to an elevation of 3793 feet. Within 

 this region, measuring no more than 90 miles in length and tapering 

 from about 35 miles in breadth at the south to perhaps 6 at the Golden 



* A Thesis presented as a part of the requirements for the Degree of Doctor of 

 Philosophy at Leland Stanford Junior University, California. 



Proc. Wash. Acad. Sci., Maj% 1910. 



