438 
4. Exobasidium discoideum, EI. 
On Rhododendron viscosum. 
5. Exobasidium Cassandre, Pk. 
On Cassandra calyculata. 
6. Exobasidium Arctostaphyli, Hark. 
On Arctostaphylos pungens. 
7. Exobasidium decolorans, Hark. 
On Rhododendron occidentale, and Rhododendron viscosum. 
The seven species have twelve hosts, and £. Vaccinit has two- 
thirds of all. Three species are confined as far as yet known to a 
single host each, and Rhododendron viscosum bears three species. 
From an economic standpoint the Z. Vaccinii is the only 
species destructive to any crop, namely, to the cranberry. During 
this summer samples were sent me from Massachusetts asking for 
a remedy, the’young stems being much distorted b¥ the fungus. 
The members of the genus as a rule are conspicuous, the 
general characteristic being a much swollen leaf or branch. The 
common azalea or Pinxter flower (Rhododendron nudiflorum) is 
known in many places as the “Swamp apple,” because so generally ~ 
producing upon the tips of the branches swollen masses, large as, 
and superficially somewhat resembles, green apples, the work of 
E. Azaleg, Pk. In the same genus on Rhododendron viscosum is 
E. discoideum, E\\., which develops upon the under surface of the 
leaves large, turbinate or discoid galls two or more centemeters 
in diameter. The £. Vaccinii wpon some hosts causes the stem 
to enlarge to many times its normal size. Galls of E. Andromeda, | 
Pk. are cupuliform and lobed, the hollow cavity containing cottony 
fibers and are, as the author states,* “ lateral or rarely terminal on 
living branches, transforming the leaf buds.” 
On the 30th of May last the writer’s attention was niaracted to 
a group of Andromeda Mariana plants in a roadway near Farming- 
dale, N. J. The tips of the-stems, instead of bending somewhat to 
one side and hanging full of the large white corolla bells charac- 
teristic of the species, were bolt upright, shorter than usual and 
bearing capitate masses of a pale green color. Upon inspection 
* Twenty-sixth Report of New York State Museum, 
