MISSOURI BOTANICAL GARDEN BULLETIN a7 
J. R. Weir, 619 fungi mostly from western United States; A. 
Yasuda, 75 fungi of Japan; S. M. Zeller, 64 fungi chiefly 
from Oregon. A detailed list of all accessions received during 
the year has been recorded in the current numbers of the 
BULLETIN. 
Mounting and Distribution—The mounting of herbarium 
specimens has continued through the year, but only a little 
more than one-half of the number of specimens acquired has 
been mounted and incorporated in the organized herbarium. 
The sorting, identifying, and distribution of specimens of 
current accessions, as well as those acquired in previous years, 
have occupied a considerable part of the time of the small 
herbarium staff. 
Field Work.—The field work incidental to a botanical sur- 
vey of the Southwest, which has been conducted during the 
past five years, has been temporarily discontinued, and in lieu 
of it, arrangements were made with the Arnold Arboretum to 
secure a complete set of the plants collected in the Ohio River 
Valley during the entire season of 1919 by Mr. Ernest J. Pal- 
mer. Some local field work, however, has been carried on 
in Missouri, Illinois, and Arkansas. 
Exchanges.—Several important series of herbarium speci- 
mens have been aequired from institutions and individuals 
with whom the Garden herbarium maintains exchange rela- 
tions. No general distribution of duplicate material has been 
made this year. 
Use of the Herbarium by Outside Botanists—A. relatively 
large number of visiting botanists have consulted the herbar- 
ium during the year in connection with monographic studies, 
but especially to examine historical type specimens. It has 
been found necessary to limit materially the loan of herbar- 
ium specimens, mainly on account of the risk involved in 
shipping but also because of the frequent fragmentation of 
specimens. Nevertheless, every effort has been made to facil- 
itate as far as possible the work of specialists who are engaged 
in monographing technical and difficult groups as well as 
those occupied with intensive floristic studies. Dr. Norma E. 
Pfeiffer of the University of North Dakota spent the entire 
summer at the herbarium in continuation of her monographic 
study of the genus Isoetes. Substantial progress has been 
made in this important undertaking and the monograph is 
nearing completion. 
