May 1903 ] Specimens Illustrating N. A. Ustilagineae 
83 
branched chains of spores, which readily fall apart. Spores 
cylindric, obtuse at both ends, smoky-pellucid, 5-6x2.5 mic. 
Growing on wood and bark of Acer, under the bark; Preston, 
Ohio. The perithecia 100-150 mic. in diameter, loosely at¬ 
tached to the matrix, scattered or often closely crowded. 
A SERIES OF SPECIMENS ILLUSTRATING 
NORTH AMERICAN USTILAGINEAE. 
A. B. SEYMOUR. 
In 1884, under the direction and encouragement of Profes¬ 
sor T. J. Burrill, I prepared a systematic account of the Ustila¬ 
gineae of Illinois, based chiefly on my collections of 1881 and 
1882 and intended to be co-ordinate with the “Illinois Uredineae.” 
But no botanical publications in this series were issued for many 
years and this manuscript with others remained untouched. 
Finally Mr. G. P. Clinton took up the study of the group, and 
with Professor Burrill’s approval I consigned my interests to the 
former. 
In nearly twenty years that have elapsed Mr. Clinton has 
been able to double the list of Illinois species. In addition to 
his years of study and his economic writings on the group in 
Illinois, he has recently spent two years at Harvard, where he 
has completed an exhaustive monograph of the North American 
species. His preliminary account was published in the Journal 
of Mycology for October, 1902. 
The series of specimens to which reference is here made, 
was published under date of January 1, 1903, to illustrate Dr. 
Clinton’s monograph. The specimens are those accumulated by 
both of us through our own collecting and by exchanges. They 
have all been verified and put in envelopes by Dr. Clinton. 
Fifteen other botanists have contributed specimens. 
Qf the 100 numbers, 63 are from Illinois, 19 from Massa¬ 
chusetts. Maine, New York and Mississippi each supply two. 
Jamaica and eleven states contribute one each. 
Dr. Clinton’s paper records 181 species and varieties with 
numerous hosts and localities. This fascicle of specimens con¬ 
tains 66 species and varieties representing 100 hosts or localities. 
Evidently much remains to be done in a future fascicle. 
All botanists are invited to contribute additional material for 
distribution. 
The main series of specimens entitled Economic Fungi is 
planned to illustrate plant diseases from a practical standpoint. 
One hundred copies are prepared and nearly every imoprtant 
