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genus on purpose to receive it, has satisfactorily terminated
the uncertainty respecting it. Of all the authors who have
noticed it, B e r n a r d i seems nevertheless to have best understood
its true structure; for, though difficult to dissect completely,
on account of its minuteness, yet the spherules are very
obvious, especially in a transverse section, as represented at
Fig. 4. in the annexed plate. The situation of Septaria in a
system, is unquestionably next to Ncemaspora, from which, as
D r K u n z e correctly observes, it essentially differs in the form
and structure of the sporidia.
Another species {S. oxycanthce) has been discovered on
Cratwgus owycantha, by Dr S c h m i d t , and published by
D r K u n z e in Mykologische Hefte, 2. p. 108. It is remarkable
for the numerous dissepiments in the sporidia. The specific
character given in the above excellent little work, is
S. Oxycanthce, sporidiis loiigissimis, curvatis, octo- ad duodecim septatis.
Hab. On the green leaves of Cratcegus oxycantha, in summer.
The spots in this species are on the upper smface of the
leaf, of a dingy purple colour, with a yellow border; tbe cirrhi
are yellowish-white, and extremely small.
Septaria Ulmi I had the pleasure of receiving from my active
friend Sir W i l l i a m J a r d i n e , Bart, several months ago.
The genus itself is new to this country; and I trust I have
contributed to render it more intelligible by accurate dissections.
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11
Fig. 1. A leaf rvith the parasitic Septaria, nat. size. Fig. 2. Plants magnified.
Fig. S. Sphernles dissected in situ. Fig. 4. Transverse section o f spherules.
Fig. 5. Spherules more higfdy magnified. Fig. 6. Sporidia.— All except
Fig. I. more or less magnified.