BULLETIN OF THE BUSSEY INSTITUTION. 33T 
passing through each stoma, and appearing to the naked eye as minute 
white specks on the discolored spots of the leaf. ‘The arrangement 
often appears concentric; and, if cultivated in the house, the concen- 
tric rings grow larger and larger, the outermost being the most 
distinct. 
The spores easily fall from their attachments; and, unless care 
is taken, all but the youngest drop off before they can be exam- 
ined under the microscope. ‘They are frequently of an oval shape, 
attached either at the end of the stalk, or often a little to one side; 
and when of any size they form an angle with the direction of the 
stalk, which warrants the name obliqua. When fully ripe, however, 
the spores are not ovate or pyriform, but long and narrow, and not 
simple, but septate with from one to three partitions. There are not 
usually any constrictions at the partitions, and the spores are rarely 
- moniliform. Sometimes the spores are very long and narrow and bent 
in different directions, and occasionally some of the upper ones branch. 
The species scarcely differs, if it differs at all, from the fungus described 
by Fresenius, in the “ Beitrige zur Mykologie,” p. 88, Pl. XI. figs. 
29-32, under the name of Mamularia macrospora. It is almost 
impossible to recognize the species of Ramularia, which have been 
described, from the spores alone, because, as is seen in the present case, 
the spores may vary from short and pyriform to long and fusiform in 
the same species. As in Peronospora, the hyphe pass through the 
stomata in tufts in many of the species of Ramularia. The latter 
genus is not well defined scientifically, as is the case with Peronospora, 
but is only a form-genus in which are placed fungi resembling one 
another in shape, but which may be only states of other fungi. Re- 
cently Schreeter* has hinted that some of the so-called Ramularie 
may be connected with species of Hntyloma. Such is, however, not 
the case with the species on Aumex, as far as our specimens show. 
Tulasne + suggests that some nearly related species accompany species 
of Stigmatea, of which he mentions that one occurs on Rumex. It 
may be that our species has some connection with Spheria. Rumicis, 
Desm., but we haye not been able to trace it. We found Cylindro- 
spora concentrica, Grev., which Schroeter $ says includes Ramularia 
* ‘Beitrage zur Biologie der Pflanzen,” Vol. II. part III. p. 435. 
t “Select Fung. Carp.” Vol. II. p. 292. 
t L.c. p. 481. 
