192 Artuur: NEW SPECIES OF UREDINEAE—XIV 
abruptly rising from the healthy tissue. The individual aecia are 
low and coalesce into a more or less continuous mass, and are 
entirely without internal filaments. 
There has been much confusion regarding the application of 
the name Peridermium Harknessti, owing in the first place to 
the obscure way in which it was first published*, and in the 
second place to the later inclusion of the Pacific Coast forms of 
the very similar P. Cerebrum, whose uredinia and telia occur 
on leaves of oak. 
The name was announced at a meeting of the San Francisco 
Microscopical Society in July, 1876, by J. P. Moore, who 
and who read a letter from H. W. Harkness describing the 
species in an informal but accurate maaner. The collection to 
which the name was applied was made by Harkness and Moore on 
May 26, 1876, at Colfax, California, which is in Placer county, 
* Our attention was directed to the early history of this name by Mr. E. 
Bethel in a letter dated January 22, 1922. Through the assistance of Mr. 
Hepburn, of the Purdue University Library, and Professor W. C. 
Blasdale, of the University of California, the following facts have been estab- 
lished. 
In the minute book of the San Francisco Microscopical Society this re- 
Pe occurs: “July 20, 1876. Mr. J. P. Moore read a paper written by Dr. 
There is also in the archives of the society a newspaper clipping 
giving a more extended account of the matter as presented to the society. 
This clipping, Professor Blasdale has ascertained, came from the issue of the 
Daily Alta California of San Francisco, of Saturday, July 22, 1876, volume 
28. It consists of the Harkness paper in full, and a paragraph stating how 
Moore proposed the name 
The society did not fee any printed account of its proceedings during 
this period of its existence, but occasionally, as the subject matter warranted, 
he secretary transmitted a more or less formal minute to the London Monthly 
Microscopical Journal. In the issue of that journal for September 1, 1876, 
an account of the meeting of July 20 is given in the same words used in the 
newspaper clipping, with three additional paragraphs 
at is referred to as a paper by Dr. Harkness is in the form of a letter 
to the secretary of the society. It begins with the sentence: ‘I have today 
forwarded for the Society’s Cabinet a specimen of Peridermium,” etc. This 
type material was destroyed in the great San Francisco fire, being bulky and 
in a box separate from other type collections, as Mr. Bethel writes, who has 
consulted the herbarium of the society both before and since the fire, and as 
stated by Meinecke (Phytopathology 10: 281. 1920), who also calls atten- 
tion to the duplicate specimen at the New York Botanical Garden 
