RoBINSON: PTERIDOPHYTA OF THE HAWAIIAN ISLANDS 231 
Dr. William Hillebrand spent twenty years in the Hawaiian 
Islands, during all of which time he was an enthusiastic botanist. 
A part of the manuscript of his Flora of the Hawaiian Islands was 
with the printer at the time of his death, in 1887, and the work 
was published the following year by his son, Dr. W. F. Hillebrand, 
now Chief Chemist, Bureau of Standards, Washington, D. C: 
The herbarium of Dr. William Hillebrand was bequeathed to the 
Royal Botanical Museum, at Berlin, Germany. The accuracy of 
his descriptions was shown by the comparison of his specimens 
with the diagnoses in his Flora. He included one hundred and 
fifty-five species and many varieties of pteridophytes. 
r. A. A. Heller, now of the College of Agriculture, Reno, 
Nevada, made a botanical exploration of Kauai and Oahu in 
1895-6 under the auspices of the Minnesota State Geological 
Survey. The larger part of the collection is at the herbarium of 
the University of Minnesota, but duplicates have been distributed 
to several of the larger American institutions and to Kew. A 
complete set of his vascular cryptogams is at the New York 
Botanical Garden, as it was sent to Professor L. M. Underwood 
for determination. The report included one hundred and sixteen 
species, six of which were new. 
In the following summary of the taxonomic study of Hawaiian 
ferns, diagnoses of the larger groups and also of genera have been 
given with keys to species, but descriptions of species already 
published elsewhere have been omitted. 
The method in this study has been to examine the specimens as 
if they represented undescribed species, then to compare them 
With types so far as possible and with published descriptions. It 
has been attempted to give the name first used for the plant in 
Linnaeus’ Species Plantarum or the name first published subse- 
quent to 1753. 
The writer is indebted to Dr. N. L. Britton, Director of the 
New York Botanical Garden, for suggestions and criticism, to 
Mr. William R. Maxon of the U. S. National Herbarium, Smith- 
Sonian Institution, Washington, D. C., for the loan of material 
and helpful criticism, and to Dr. J. H. Barnhart, Librarian of 
© New York Botanical Garden, for suggestions and criticism 
48 to form, also to Professor A. Engler, Director of the Royal 
