: f W
[ 0
boiirliood of Berberry bushes is extremely detrimental to fields
of wheat. It is well known that the disease called the Bust
in corn is highly injurious ; but the colour of the rust, and that
of the present plant, constitutes the only similarity between
them. They belong in fact to two different genera, and of
course cannot propagate each other. I have nevertheless heard
creditable persons affirm, that they have seen the corn fail for
a considerable space round a berberry bush, while it was strong
and fertile in the rest of the field. I f this is in reality owing
to the Berberry (which I do not think), it must be attributed
to some other cause than the parasitic plant here figured and
described.
Like Æcidium Thalktri, already represented in this work,
Æ . Berberidis belongs to L i n k ’s genus Roestelia ; but I
have already shewn that the genus Æcidium cannot bear di-
Vision.
Fig. 1 Æcidium Berhcridis, nat. size. Fig. 2. A group o f Peridia, rvith their
orifices dentated. Fig. 3. A group o f Peridia having lost their teeth. Figs. 4.
and 5. Sporidia.—All but Fig. 1. more or less magnified.