LICHENS OF THE G. ALLAN HANCOCK EXPEDITION OF 

 1934, COLLECTED BY WM. R. TAYLOR 



By CARROLL WILLIAM DODGE 



Mycologist to the Missouri Botanical Garden 



Professor in the Henry Shaw School of Botany of Washington University 



Our knowledge of the geographical distribution of the lichens of 

 tropical America is very fragmentary, usually depending upon col- 

 lectors who were primarily interested in other groups, frequently 

 flowering plants, and described by persons with little or no field 

 experience in the American tropics. Our knowledge of the lichen flora 

 of the Galapagos Archipelago and of the coastal regions of the Pacific, 

 south of California, is even more fragmentary. Since Darwin collected 

 a few lichens in the Galapagos a century ago, collectors have occa- 

 sionally visited the islands and returned with lichens collected in- 

 cidentally in connection with other work. The collections of Snodgrass 

 and Heller (Robinson, 1902) and of Stewart (1912), both identified 

 by Farlow, were the most extensive. Stewart gives brief ecological 

 notes on the commoner species. Svenson, on the Astor expedition of 

 1930, brought back six specimens from Santa Cruz (Indefatigable) 

 Island and one from Tower Island, studied by the writer and pub- 

 lished in Svenson (1935). J. T. Howell of the Templeton Crocker 

 expedition 1932 (cf. Linder, 1934) returned with one species (pre- 

 viously reported from Chatham Island) and Dictyonema sericeum 

 from Santa Cruz (Indefatigable) Island. The present collection adds 

 about a score to the Galapagos list of 51, and five new stations in 

 the archipelago. 



Linder (1934) has summarized the previous collections of lichens 

 in the Revilla Gigedo Archipelago, listing 18 species, exclusive of 

 Roccellaceae. The present expedition added seven new species and 

 one new locality to this list. Except for Barro Colorado Island in 

 Gatun Lake where one specimen was taken, all the other localities 

 have probably never been visited by a botanist. 



No novelties are reported at this time, as the groups which the 

 author has studied intensively are poorly represented and in some 

 of the larger more difficult genera the material is inadequate, a 



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