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J. C. ARTHUR 
tion have been published by Dr. Frank D. Kern,^ the first one enumer- 
ating forty species, five being described as new, and the second giving 
fifteen species, one being described as new. Two decades of fungi 
were issued by Professor Kellerman,^ together containing seventeen 
species of rusts. All the collections listed in these four publications 
and a few others are cited in the following pages, making a total of 112 
of the Kellerman mycological numbers. 
Professor E. W. D. Holway has made three visits to Guatemala: 
December 30, 1914, to February 10, 1915; February 7 to March 23, 
1916; and December 19, 1916, to February 18, 1917. The last visit, 
although the longest of the three, was brought to a premature termi- 
nation by the disturbing influences of the European war. A total of 
600 rust numbers has resulted from these explorations, and a duplicate 
set of this rich lot of material was placed without restrictions in the 
hands of the writer for study. As will be seen by the following enu- 
meration there are considerably more than two hundred species repre- 
sented, that is, every third specimen collected supplied an additional 
species. In order to make a full showing of all Guatemalan rusts 
known up to the present time, there have been added eighteen species 
from the Kellerman material not taken by Professor Holway, and four 
such species from other sources. 
Considering the area of country involved and the comparatively 
limited amount of exploration, the list of species here presented doubt- 
less indicates a richer rust flora for Guatemala than for any similar 
area on the North American continent, although it is the opinion of 
Professor Holway, based on field experiences, that southern Mexico is 
the real paradise for the collector of rusts. No comprehensive account 
of Mexican rusts has yet been published, and statistical comparison is 
not at present possible. 
Professor Holway entered Guatemala each time at the Atlantic port 
of Barrios, and made good use of the country's five hundred miles 
of railway. He also explored by other means of transportation and 
particularly by the aid of mules and Indian guides. Professor Holway 
possesses in a high degree those accessory qualifications of a successful 
collector, unbounded enthusiasm, keen enjoyment of the beautiful, 
^ Kern, F. D. The rusts of Guatemala. Journ. Myc. 13: 18-26. 1907; The 
rusts of Guatemala II. Mycologia 3: 288-290. 191 1. 
2 Kellerman, W. A. Fungi select! Guatemalensis exsiccati. Journ. Myc. 12: 
238-241. 1906; 13: 99. 1907. 
