\ 
FLORA OF THE GALAPAGOS ISLANDS. 79 
I am greatly indebted to my colleague, Professor W. G. Farlow, for the 
treatment of the difficult orders of Fungi, Lichenes, Algae, and Musci, to 
Dr. A. W. Evans of Yale University for the treatment of the Hepaticae, 
and to Professor K. Schumann of the Royal Botanical Museum at Berlin 
for the elaboration of the Cactaceae of the Hopkins-Stanford Expedition. 
Further expert assistance has been kindly and very promptly given by 
Mr. Casimir de Candolle of Geneva (Peperomia), Mr. C. B. Clarke cf 
Kew (Ayllinga), Professor A. Cogniaux of Verviers (Miconia), Professor 
F. Lamson-Scribner of the United States Department of Agriculture 
(Chloris), Dr. Gustav Lindau of Berlin (Justicia), and Dr. Hans Hallier of © 
Hamburg (Jpomoea). Iam likewise indebted to Sir W. T. Thiselton-Dyer 
and Mr. W. Botting Hemsley for some comparisons at the Royal Gardens 
at-Kew and for a list of the plants collected upon the Galapagos Islands by 
Dr. A. Habel. Mr. F. V. Coville and Dr. J. N. Rose of the United States 
National Museum have generously furnished me with duplicates of many 
of the plants secured on the Galapagos and Cocos Islands by Messrs. 
A. Agassiz and Lee, and also sent several unicates for examination. 
Professor William Trelease has obligingly forwarded the Galapageian 
Cactaceae from the Engelmann Herbarium for comparison. Sir J. D. 
Hooker has kindly given me interesting data concerning the history of 
the botanical exploration on the islands, Mr. J. Henry Blake, artist on 
the “ Hassler,” has furnished information regarding that expedition, and 
Miss Mary A. Day, librarian of the Gray Herbarium, has rendered effi- 
cient assistance in bibliography and tabulation as well as in an exbaustive 
search for information relating to the early expeditions to the islands. 
The plates have been drawn by Mr, F. Schuyler Mathews. 
The bryophytes and thallophytes, as yet known to occur on the 
Galapagos Islands, are so few that they cannot be supposed in any 
adequate sense representative of the great groups to which they belong. 
It has, therefore, seemed best to exclude them from the tabular statistics. 
It may be remarked, however, that their inclusion would not have . 
significantly altered the numerical relations presented. 
Of the following plants, said to have been collected on the Galapagos 
Islands by Dr. Habel, the identifications (which cannot now be controlled 
by a reéxamination of the specimens) have seemed too doubtful to 
include in the catalogue: Boerhaavia diffusa, L., Neptunia triquetra, 
Benth., Rhynchosia Senna, Gillies, Stylosanthes humilis, HBK., Tribulus 
terrestris, L. var., Acalypha parvula, vars., Waltheria ovata, Cav., and 
LEvolvulus alsinoides, L. var. 
From Table I, reviewing the exploring expeditions which have done 
