Lichens of Santa Cruz Peninsula 327 



The systematic treatment of lichens by Dr. Alexander Zahl- 

 bruckner in Die Natiirlichen Pflanzenfamilien is as yet only 

 partially completed, but as far as possible this authority has been 

 followed in generic names. Genera not treated in the portion 

 thus far published are defined according to Tuckerman exxept 

 that the genus Gyrophora has been used to designate our forms 

 belonging to Tuckerman's genus Uinbilicaria. 



As far as possible the author has attempted to retain the 

 earliest specific name though he is aware that his attempt has 

 probably not been wholly successful. The synonymy of lich- 

 ens seems to be in a chaotic condition and is in urgent need of 

 thorough revision. Personally the author believes that the same 

 principles should be applied to botanical nomenclature that have 

 been adopted by zoologists. 



To Dr. H. E. Hasse, surgeon of the National Soldiers' Home 

 near Santa Monica, California, I wish to express my profoundest 

 gratitude ; without his active cooperation my material would 

 have been of little value. To Dr. A. Zahlbruckner, of the 

 Royal Botanical Museum, Vienna, Austria, I owe a debt not 

 second to that due Dr. Hasse. Each of the above has gone 

 over a duplicate set of my material and revised my determina- 

 tions, with a few exceptions which are noted in each case. 

 Professor Clara E. Cummings, of Wellesley College, has also 

 kindly determined material. For the keys and descriptions I 

 alone am responsible. 



To Mr. LeRoy Abrams I am indebted for the use of his her- 

 barium and for material from southern California. To Dr. G. 

 J. Peirce, of Stanford University, I am indebted for literature 

 otherwise inaccessible, and for many valuable suggestions. 

 To Professor William R. Dudley, head of the department of 

 systematic botany in Leland Stanford Junior University, I owe, 

 besides material favors such as literature and specimens, the 

 encouragement and guidance which have made this paper 

 possible. 



Stanford University, September, 1905. 



