STUDIES IN PORTO RICAN PARASITIC 
FUNGI— I 
Esther Young 
The present paper is a report of the results of a study of the 
genus Phyllosticta as represented in Porto Rico, Desecheo, and 
Mona Islands. The material studied is from the collection of 
Dr. F. L. Stevens, and each specimen examined is reported under 
the original number. The specimens were all collected by Dr. 
Stevens in the years 1912 and 1913. The original collection was 
divided into two portions, one being left with the College of 
Agriculture and Mechanic Arts at Mayaguez, Porto Rico, and 
the other donated to the University of Illinois. In my studies I 
have made use of the material in the collection of the University. 
The type specimen is in each instance indicated by its original 
number, and is deposited in the herbarium of the University of 
Illinois, and a duplicate cotype is also deposited with the New 
York Botanical Garden. In cases where the collection was 
reasonably large, the surplus cotype material is placed in the her- 
barium of the University. Occasional notes have been added by 
Dr. Stevens concerning local distribution, etc. 
I hesitate somewhat to describe these new species as belonging 
to Phyllosticta rather than Phoma, since I believe there is no ten- 
able distinction between these genera. However, since it is cus- 
tomary to regard the forms on leaves as belonging to Phyllosticta, 
probably no good would be done by breaking over that custom in 
this instance. The final designation of these and related forms 
must be made after a monographic study of the genus. 
The writer is under obligations to Dr. F. L. Stevens, under 
whose direction the work was done, whose many kindnesses and 
suggestions have made this publication possible. Expressions of 
appreciation are also due to Dr. N. L. Britton, Mr. Percy Wilson, 
and Miss Margaret Slosson, of the New York Botanical Garden, 
and to Mrs. Agnes Chase, of the Bureau of Plant Industry, for 
assistance in determining host-plants. 
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