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Considerable confusion appears to exist among some of the
orange Uredines parasitic on the R o s a cE æ , particularly between
U. miniata and pingues. P e r s o o n brought two distinct
species together under the former, which is not surprising,
if we consider how little was known of these minute plants
when his Synopsis was published. His variety a I think certainly
belongs to our species, as well as D e C a n d o l l e ’s
U. Rosæ /3 ; his var. a being what is usually taken for U. miniata,
and is extremely common on the leaves of Rosa centi-
fo lia in gardens. The many names under which our plant has
been described, has induced me to adopt the very characteristic
one given by S t r a u s s , in Annalen der Wetterauischen G<?-1
selschaft, which, as it is now accompanied by the first figure
published of the species, will, I hope, be sufficient to prevent
any future confusion. I am not aware of any other species of
orange Uredo that attacks the veins, petiols and calyces of the
roses, or of Spiræa Ulmaria ; nor is the present species generally
found on any other parts, though certainly not confined
to them.
It is probably extremely common, especially where Rosa
spirwsissima is found in abundance. I have gathered it every
where around Edinburgh, and have received it along with a
great number of new and interesting plants of the same Order,
from my highly gifted and valued friends Miss E. and Miss
M. B o sw e l l of Balmuto.
Fig. 1. Urech effusa on Spiræa ulmaria. Fig. 2. On the seed-vessel o f Rosa
.spinosissima, nat. size. Fig. 3. Ditto magnified. Fig. 4. Sporidia.
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