176 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
aceae; and jNIr. W. R. Maxon has revised the list of- ferns. Professor 
I. Urban has made some corrections in my identifications and has 
piibhshed 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 Cryptogamic 
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 jVIiss M. A. Day, librarian of the Gray herbarium, who 
has verified the references and otherwise assisted in the bibliogra])hical 
work, many thanks are due. 
In working out the identifications of the plants listed in the following 
catalogue manv 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 diflSculties 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 grou])s which have not been revised 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 conjimction 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 vmder such circumstances. The reference to Ernst with some 
page number is to Ernst's Estudios sobre la flora y fauna. 
