DERIVATION OF THE FLORA AND FAUNA 243 



IV. West Pacific element. — 3 (2.4 %). 



a. Endemic (2): Trichocolea opposita, Cololejeunca Skottsbergii. 



b. Xot endemic: Pallavicinia xiphoides. 



V. Known from St. Paul and New Amsterdam Is. — i (0.8 %). 

 Riccardia insularis. 



The American element is in absolute dominance; 120 species, 96.8 %, belong 

 to elements I-III. The Pacific grouj) is very small, but as we shall find later, many 

 species are austral and biccntric. 



Table IV. 



Comparison between the Angiosperms, Pteridophytes and Bryophytes. Figures in %. 



A, Andine-Chilean; M, Magellanian; X, Neotropical; P, West Pacific. 



A M N P ' 



Angiosperms 46.9 10.2 12.9 17.7 



Pteridophytes 64.1 7.5 17.0 9.4 



Mosses 64.2 10.8 1 1.7 10.8 



Hepatics 78.3 14.5 4.0 2.4 



The lower percentage of Mosses in A, as compared with the Hepatics, may 

 be due to imperfect knowledge of the distribution and to the fact that 1 1 moss 

 species had to be left out of consideration. 



V. Lichenes. 



What I have said above when dealing with the Bryophytes holds good of 

 the Lichens in a still higher degree: no lichenologist ever visited Juan Fernandez, 

 and a non-specialist is bound to pass over many species; collecting crustaceous 

 lichens growing on hard basalt is not easy and generally time-absorbing. Our 

 collection is listed after Zaui.BRUCKNER [2C)6, 2py), where also the species found 

 by other collectors, but not found by us, are included. Some changes had to be 

 made; for instance, Zahlbruckner did not distinguish between S/hla and Pseu- 

 docyphellaria\ on my request. Dr. R. Santesson kindly revised the nomenclature. 

 Some determinations in these and other genera were corrected by him (see vol. 

 II. 886). Later he went over the proof-sheets of this paper and added further 

 corrections. I thank him for generous assistance. 



It is to be regretted that ZAHLBRUCKNER did not indicate the distribution 

 of the non-endemic species, and the statements in his Catalogus are too general. 

 I have tried to collect further data from a number of papers on the flora of Chile 

 and the Subantarctic and Antarctic regions (j, 32, /j, ijg, 176, 177, 182, 184, 2gjy 

 J2y-j2g) but it was beyond my possibilities to search the entire literature. Dr. 

 A. H. Magnusson, who kindly took the trouble to go over my list, supplied much 

 useful information. 



SC = Santa Clara. 



