176 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



aceae; and IVIr. W. R. Maxon has revised the hst of ferns. Professor 

 I. Urban has made some corrections in my identifications and has 

 ])ubhshed several new species based upon my plants. The collection 

 of fungi and of algae made by Dr. A. F. Blakeslee has been identified 

 by Professor W. G. Farlow and is deposited in the Cr\^3togamic 

 herbarium of Harvard university. This collection is not included in 

 the following list of Margaritan plants. 



To all these who have so generously assisted me and especially to 

 Professor B. L. Robinson under whose supervision this work has been 

 done and to JNIiss M. A. Day, librarian of the Gray herbarium, who 

 has verified the references and otherwise assisted in the bibliographical 

 work, many thanks are due. 



In working out the identifications of the plants listed in the following 

 catalogue many difficulties were encountered, chief among them being 

 the great lack of South American plants for comparison, and the 

 uncertain condition of many South American genera and species. 

 These difficulties have been overcome to some extent by the assistance, 

 already referred to, of specialists on certain groups. The bulk of the 

 plants, however, remained in groups which have not been re\ased for 

 some time. 



The citations to be found in the catalogue, consist of the original 

 references to the names which are used, a reference to the earliest use 

 of the specific name, and in addition reference to either or both Grise- 

 bach's Flora of the British West Indies and Martins' Flora Brasiliensis, 

 as well as a reference to some published illustration, and when possible 

 a citation of monographs of the various groups. These are the works 

 which have been used in conjunction with herbarium specimens to 

 make the identifications, to determine the character of the species. 

 From these my idea of the species was obtained and for that reason it 

 seems desirable to cite them in this list. In addition to these references 

 I have also given the occurrence of the species in Venezuela as a whole, 

 this being ascertained by reference both to publications and to speci- 

 mens. All specimens here reported and collected by Fendler, by 

 Rusby and Squire, by Robinson and Lyon, by Birschel, and by A. H. 

 Moore have been personally examined by me and compared with my 

 own material. Other references than those of species to Venezuela 

 are taken from publications and are given for only what they may be 

 worth under such circumstances. The reference to Ernst with some 

 page number is to Ernst's Estudios sobre la flora y fauna. 



