BOTANICAL GAZETTE. 243 
species has, I believe, never been known to produce sori. Our nearest related 
species is S. papillatum, in which the deformity is also confined to the epidermal 
cells, which swell to a greater size than in the present species and are constant- 
ly papillate. S. papillatum, however, produces sori of zoosporangia, and be- 
longs to the subgenus Eusynchytrium. ; 
What seems to me to be the typical form of the species has recently been 
found on Pectocarya linearis, DC., in Sonora, Mexico, by Mr. C. G. Pringle. The 
swollen epidermal cells are very numerous, and completely cover the petioles 
and young stems. When the parasite is immature the cells are yellow, but as 
the resting spores mature the cells assume the usual deep red color. 
10. S. PLURIANNULATUM. 
On Sanicyla Marylandica and S. Menziesii, Hook & Arn. 
Alabama to Illinois. California. 
striking species, the development of which should be studied by 
western botanists. The parasite is abundant on the leaves, petioles and stems. 
On the leaves it appears in the form of more or less circular, disk-like spots. 
On the stems the spots are elliptical or lenticular. The disks vary very much 
mber of cells lying near one 
In the meanwhile 
ked by the parasite 
multiply rapidly, and the result is a solid disk-like mass in which lie the host- 
cells, which, seen from above, look like granules. 
the gall, if we may so term it, is seldom seen in any of our 
pel in one or two European forms. It is only the very smallest spots that 
ag of a single host-cell, which is then usually spherical and covered by a 
thin layer of leaf cells, and I have seen cases where it protruded on both sides 
ofthe leaf. The most curious form of the galls is one sometimes found on 
the petioles and young stems. Here the superficial tissues, as far as one can 
“8 from dried specimens only, grow out at right angles to the stem, so 48 to 
a the sort of pedicel, sometimes an eighth of an inch long, and bear at the tip 
la ark brown head, which contains the host-cells and resting spores. On the 
ad stems the parasite looks to the naked eye like the sori of a Puccinia, owing 
ii lenticular shape of the spots, which are often surrounded by a fold of the 
*pidermis, ; 
species, but is com- 
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