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that Uredines, Puccinice, M c id ia , and other minute G a s t r o -
MYCI, as well as several individuals of the Order B y s s o i d e a : ,
are often exceedingly partial to particular vegetables, and often
wholly confined to a natural order, or even section of an order,
and retain their distinctive character. Although a part of this
character may be derived from the vegetable on which they
grow, it is by no means conclusive, that most Uredines, &c.
are tbe same species, modified by circumstances, as some botanists
have supposed; for Uredines of different sections in regard
to colour, and also of different forms in regard to their
sporidia, frequently occur on the same plant, nay even on the
same leaf.
Fig. 1. Uredo Polygonorum, on Polygonum amphibium, nat. size. Fig. 2. A
group magnified. Fig. 3. Sporidia.
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