A PARTIAL LIST OF THE PARASITIC FUNGI OF DECATUR 
COUNTY, IOWA * 
BY J. P. ANDERSON. 
INTRODUCTION. 
During the years 1897 to 1905 the writer did considerable collecting 
of botanical material in Decatur County, Iowa, Parasitic fungi were 
included and the following list is based largely on the material collected 
aft that time. The list is far from complete. There is still some uniden- 
tified material on hand, and no special effort was made to have the 
collection complete originally, as the phanerogams were the special group 
sought. Specimens of most of the species 1 here enumerated are deposited 
in the herbarium at Iowa Static College. Some of the diseases of 'economic 
plants, however, are based on notes and observations:, no specimens 
being collected. 
The thanks of the writer is due to Dr. L. H. Pammel for assistance 
in the identification of species. Also to Dr. Pammel and his assistants 
for other assistance rendered. 
BACTERIACEAE. 
1. Pseudomonas campestris (Pammel) E. Smith. 
On Brassica oleracea (cabbage). 
:2. Pseudomonas tumefaciens E. Smith & Townsend. 
On species of Amygdalus, Malus, Prunus, Pyrus, Rosa, Rubus, 
and Yitis. Most common on apple. 
3. Bacillus amylovorus (Burr.) De Toni. 
On species of Malus and Pyrus, especially destructive on P. 
communis L. 
4. Bacillus tracheiphilus E. Smith. 
On Cucumis sativus L. Sometimes very destructive. ' 
, *We do not have an accurate knowledge of the distribution of parasitic fungi in 
different parts of Iowa. Some excellent collecting has been done by Dr. Macbride of 
the State University, Dr. J. C. Arthur of Purdue University, E. D. Holway of Min- 
neapolis formerly of Decorah, A. S. Hitchcock of the U. S. Dept, of Agriculture, Dr. 
R Halsted and E)r. C. E. Bessey formerly of Ames and members of the staff 
ot the Dept, of Botany, Iowa State College, in recent years. The lists are, however, 
tar from complete and should be greatly extended. — L. H. Pammel. 
