102 The Botanical Gazette. [Marc 
The distortions caused by Exobasidium Andromeda, whith 
are much the largest of any caused by the Exobasidia, han 
down as large, usually greenish, bag-like distortions from th| 
smaller branches of the host, Andromeda ligustrina. As fat 
as could be determined the distortions arise from the young 
buds, either leaf or flower buds, but usually the former. The 
are attached by a very small point and easily break off. I) 
size the bags vary anywhere from five to six inches long ly 
four across, to small distortions not over two inches in thei 
longest diameter. The color, while often more greenish that 
other Exobasidia, sometimes is the characteristic pink ort 
that one sees in E. Vaccinii on Gaylussacia. 
In structure the mature gall is hollow with comparativel 
thin walls which are supported by numerous more or Ié 
branched cords of tissue that radiate from the point of at 
tachment and terminate on the inner surface of the W 
With the exception of these cords and a certain amount 
loose tissue hanging to them, the fully grown distortion § 
quite empty, contrasting with the form of E. Vaccinil® 
Rhododendron viscosum commonly known as E. Azalez. lt 
the young condition the distortions of E. Andromede #* 
solid and almost succulent like those of the other form®™ 
ferred to. 
_ The cords which traverse the interior of the gall are noth 
ing more than the distorted vascular bundles to which half 
a certain amount of loose parenchymatous tissue. The’, 
of the latter are very much elongated and very thin walle 
Sometimes they even branch (fig. 12), forming a mesh wot, 
of filaments, often of considerable extent. In the younge 
distortions this parenchymatous tissue is more solid, and! 
may be said indeed to represent the distorted leaf parel 
chyma, but, as the gallincreases in size, the cells até ee 
apart and, ceasing to multiply, leave the interior of the dist 
Gen hollow. As far as the vascular bundles are conce ath 
while they are very much split up and twisted, the spirald re 
and other wood elements individually present no very @ 
mal appearance. 
The wall, which in the mature specimens is really 
all there is to the distortion, consists of a number of lay® 
rounded parenchyma cells, tightly packed near the i 
and gradually merging into the elongated cells below be 
The epidermal cells themselves, while enormously incr 
eatil 
rs 
