135 
from the cells of the leaf without any well-defined mycelium, and form 
a continuous olive brown or green stratum on the lower surface of the 
leaf, beginning Avitli well-defined brown spots which soon spread and 
occivpy the entire leaf—mostly the young terminal ones. 
REVIEWS OF RECENT LITERATURE. 
Farlow, W. Gr., and Seymour, A. B. — A Provisional Host-index of 
the Fungi of the United States. Part I, Polypetalae, pp. 1-52, 
Cambridge, 1888. Part ii, (f amopetalae-Apetalae, pp. 53-134, Cam¬ 
bridge, September, 1890. Part in, pp. 135-220, Cambridge, June, 
1891. 
The issue of the third part of the above work, containing the endo- 
gens, cryptogams, and animals, and an addenda, together with an index 
to all three parts, finishes this most valuable and laborious work. As 
completed it contains 220 octavo pages. About 85 names on an av¬ 
erage, including synonyms, are given on each page. The Avork Avill be 
a necessity to every American mycologist, and, aside from its direct 
value as a host-index, will be of very considerable worth as a guide to 
the synonomy of the American species of fungi. In accuracy and com¬ 
pleteness it is almost without equal among mycological publications. 
It is to be wished, however, that a reference could have been given 
after each name of a fungus to one or more Avorks in which it was re¬ 
ported on the host in question. It is likely that descriptions of some 
of the species will be troublesome to find. A title page for all three 
parts Avould also be a valuable addition. 
Some interesting facts are revealed by a study of the index. The 
number of species reported on some genera of trees is truly astonishing. 
The family Cupuliferre requires 24 pages, and these Avill probably av¬ 
erage no less than 100 names ot fungi to a page. A most striking fact 
is the very small number of species reported on Algne. Only two species, 
both Chytridiij are given. These occur on four species of Algae. In 
Europe, on the contrary, Avhere the algal parasites have been carefully 
studied, their number is very considerable, probably aggregating several 
hundred species. 
Botanists everywhere would no doubt be very grateful if the authors 
of the u Host-index” could be induced to prepare the converse work, 
namely, a list of the species of fungi of the United States Avith their 
host plants.—W. T. Savingle. 
Fischer, Dr. Alfred.— Phycornycetes. Rabenliorst’s Ivryptogamen- 
flora. I Band. IV Abtheilung: Pilze; 45, 46 and 47 Lieferuugen, pp. 
1-192. Leipzig. Ed. Kummer, 1892. 
Part. IV of this important Avork begins with No. 45. Part III on 
Diseoinycetes by Dr. Relim still lacks eight numbers of completion, but 
