NO. 2 DAWSON : MARINE RED ALGAE OF PACIFIC MEXICO 287 



Type: Holotype is Coker 144, Mar. 27, 1907, in the Herbarium 

 of the New York Botanical Garden, New York. A fragment of the host 

 bearing several "warts" is in HAHF. 



Type locality: Growing on Zanardinula decipiens at Lobos de 

 Afuera, Peru. 



Mexican distribution : This peculiar structure occurs on various 

 species of Zanardinula along northern Pacific Baja California to Isla 

 Cedros and Isla Natividad. The lack of any clearly identifiable repro- 

 ductive organs, despite the abundance of the cushions, suggests that they 

 probably do not represent an independent organism, but rather may be a 

 malformation resulting from a parasitic bacterial ? infection. 



Callymeniaceae 



Except for the doubtful Callymenia? pertusa, with only a single 

 genus in the Mexican flora. 



Gallophyllis Kiitzing 



The publication of Setchell's Revision of the West North American 

 Species of Gallophyllis in 1923 could have been a landmark in the study 

 of this difficult genus. However, he chose to publish a regrettably short 

 outline of his studies, without illustration and with only the briefest of 

 validating descriptions in Latin. The key to the species, which might 

 have been the one saving grace, was made unworkable by a major typo- 

 graphical error. As a result, the identification of most species of Callo- 

 phyllis along the Pacific Coast has not been facilitated and has required 

 the matching of material with the type specimens in the Herbarium of 

 the University of California. This has necessarily been the procedure 

 followed in the present study of the Mexican species of the genus. 



Since a considerable number of species occur in Mexico and require 

 illustration in this paper, it was felt that further study of this genus 

 would be greatly aided if all the species described from the Pacific Coast 

 were to be illustrated here together. Accordingly, in addition to more 

 detailed treatment of the Mexican species, the following account also 

 deals briefly with each of the others. They are listed alphabetically, and 

 in each case a photograph of the type specimen or of a specimen suitably 

 representative of the type is given. 



It is also felt that future students will derive some aid from the 

 reprinting of Setchell's key with inclusion of the critical third line which 

 was originally dropped out by the typesetter. This follows below and 

 precedes the writer's key to the Mexican species of Gallophyllis. 



