410 SEPTORIA QUERCI. 
The whole process is similar to the germination of the cucurbitaceous Megarrhiza of California, 
so beautifully illustrated by Gray in his Structural Botany ; with this difference, that the cotyledons 
in that plant are raised above the ground,* while in ours they remain hypogzous, and that the stalk 
is even longer, and is, together with the cotyledons, readily separable into its two component parts. 
In both plants a tuber forms at once by the transfer of the food-matter from the cotyledons to the 
radicle ; in the herbaceous Megarrhiza the tuber becomes a permanent organ of immense size, while 
in the arboreous live-oak it is finally merged in the root. 
IV. DESCRIPTION OF SEPTORIA QUERCI. 
FroM THE TRANSACTIONS OF THE St. Louis ACADEMY oF Science, Vou. III. 1878, Proczepines. [Read in 1876.] 
I PRESENT to you another Fungus, on oak-leaves, which show the same yellow decayed spots; but here [ccxvi] 
you have to look for the perithecium, the fruit, if we may call it so, of the fungus, to the lower side of the leaf, 
and it is not a black globule as in the grape-leaf, but a brown elevation, little darker than the surrounding spot. I 
find no pore at the top, but suppose that it emits its spores through a rent. These are very different from the spores 
of the Depazea [Labrusce],t being elongated, usually curved and septate, or forming three or four compartments ; the 
spores are a little longer taan those of the grape-spots, the perithecium is twice as large as that of the grape. 
The septate spores indicate that it belongs to the genus Septoria, and the fungus may bear the name of Septoria 
Querct, — 
* But only exceptionally. — Eps 
t The remainder of this note will be found below under ‘‘ Diseases of the Grape.” — Eps. 
