468 BOTANICAL GAZETTE | JUNE 
The following on Zi//etia corona Scrib., by the same authors, gives 
the different neat and localities where this interesting smut has been 
found: 
This striking smut was first observed by Scribner on Homalocenchrus ory- 
zoides and HY, Virginicus near Washington, D. C., in 1886, and specimens 
collected by him were distributed by Ellis under the above name in N. A. F., 
as no. 1896. It has since been collected by Waite in Illinois and Missouri on 
fHlomalocenchrus, on Panicum virgatum in Illinois, and by the writers in 
Mississippi on /fomalocenchrus lenticularis and H. Virginicus at Columbus, 
on “7, lenticularis at Bairds, and on Panicum sanguinale at Starkville. Speci- 
mens on Panicum virgatum in the herbarium of the Division of Vegetable 
Pathology at Washington bear the unpublished herbarium name 7i//efia 
bulcherrima Ell. & Gal., but they seem identical with the forms on the other 
hosts. 
The Tilletia infesting the ovaries of the rice plant agrees in most 
respects with the above description of 7Z1//etia corona Scrib. The 
ovaries become transformed into a black, granular mass of spores. 
Fic. 1.—A- a, normal rice spikelet ; 
6, the aia’ rice grain after the 
glumes have been removed; ¢, cross 
section of a normal 
Ae ge ON acid ‘epikelat the 
glumes of which have been rartly 
pressed apart, exposing the spore 
mass, é, 6’, after the glumes have been 
removed, spore mass exposed at 4, 
the fissure in the original ovary wall; 
c', cross section of a smutted grain 
filled with spores. 
Ge , an affected spikelet, the 
ovary of which has been partly hyper- 
trophied; 4", after the glumes have 
been removed, showing @, the fissure 
in s, the original ovary wall; c”, cross 
section of the destroyed grain. 
They are, however, seldom hypertrophied or atrophied, but retain to a 
great extent the form and size of the normal ovaries. They are never 
curved like the affected ovaries of the other hosts of Zi//etia corona. 
As is well known the two glumes of rice spikelets are hard, cover 
firmly the whole ovary, and remain attached to it when mature. In 
smutted panicles the affected spikelets are hardly distinguishable from 
the normal ones, since the destroyed ovaries remain inside of the two 
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