258 BOTANICAL GAZETTE | SEPTEMBER 
by him as Aicidium,? and from Ocean Springs, Mississippi, where one 
of the present writers discovered its true gymnosporangial character, 
and also its peculiar reestelia, in 1892. The Mississippi material was 
first collected in January 1887 and sent to Professor Farlow, so that 
Mississippi is one of the type localities of the original description. 
Later in the spring of 1892 the teleutospores were discovered, and in 
October of the same year the reestelia with its distinct, long exserted, 
lacerate peridia was found on the same galls, the old broken bases of 
which must have formed the peridia of the supposed A.cidium as orig- 
inally described. The species, therefore, unlike all its congeners, 
produces its ecidial and teleutosporic stages on the same host, from 
the same gall, and in all probability from the same mycelium. The 
species can scarcely be said to be common, though when found it 
usually infests considerable portions of the tree in which it occuts. 
Several stations are now known for the parasite at distances of a few 
miles from the original tree where it was found in 1887. 
The conditions of growth manifested by the last species introduce 
a new and interesting problem into the question of the evolution of 
the various species of the genus. At one extreme of the series We 
have G. macropus and its new ally, annual species, producing their 
reestelias on various Pomaceze and consequently dependent for their 
perpetuity upon the success of their annual sowing and interchange of 
host. Then we have the various species that are perennial and thus 
capable of continuing from year to year without the intervention of 
the reestelia stage, but with which they continue to propagate them 
selves more widely. Then, finally, we have G. Bermudianum produc: 
ing both stages on the same host and therefore independent of the 
Pomacee for its continuance. The details of this evolution will co® 
stitute a further problem.— Lucien M. Unperwoop and F. S. Baki 
Auburn, Alabama. 
BOTANICAL APPLIANCES. 
(WITH PLATES IX AND X.) ; 
BOTANICAL appliances serve for investigation and demonstratio® 
and while some of the following appliances were devised for ae . 
work they have also been used in demonstration in a practical — 
of vegetable physiology in our laboratory, 
* “icidium Bermudianum Farlow, Bot. Gaz. 12:206. 1887. 
