301 
The perithecia are immersed in the tissue of the leaf, the 
ostiolum and the upper surface projecting through the epidermis. 
They occur abundantly on either side of the leaf. The sutures 
of the reticulated surface are quite black, giving a very dark ap- 
pearance to the perithecia. They measure 60-70 X 65-90 yu. 
The asci are subcylindrical, varying to slightly clavate or lan- 
ceolate, and measure 8-10 X 40-45. They are eight-spored, 
though it is difficult without rupturing them to ascertain that 
number. 
_ The spores are elliptical, or nearly fusoid, and when mature 
constricted at the septum, one cell being usually somewhat smaller 
than the other. They are obliquely uniseriate or partly biseriate, 
and measure 3-4 X 15-18 /. 
In the plate illustrating the article I have included the Cer- 
cospora stage, the three figures representing variations in the 
length of the hyphz and conidia, as determined by different con- 
ditions of weather, a warm humid atmosphere, with abundant 
rains, conducing to a very profuse growth. 
All the figures are drawn with aid of the camera lucida to the 
same scale except the free ascospores, which are a trifle larger. 
EXPLANATION OF PLATE. 
Spherella gossypina, Atkinson, n. sp. Figs. 1, 2, 3, different conditions of 
the Cercospora stage. Fig. 4, perithecium with asci escaping ; fig. 5, asci with as- 
cospores ; fig. 6, ascospores. 
DEPARTMENT OE BIOLOGY, 
ALABAMA POLYTECHNIC INSTITUTE, 
AuBuRN, ALA., AuG. 6, I8gI. 
- Plants Introduced at Sellsville, near Columbus, 0.* 
The place has been used by the Sells Brothers as the winter 
quarters of their circus and menagerie for the past twelve years. 
All of the list below were discovered since October 1, 1890, by 
those connected with the University Biological Club. 
Those marked with an * are not known to occur elsewhere in 
the State. ; 
Evodium cicutarium, Her; also at Painesville, Lake Co. 
* Callirrhoe Papaver, Gray ? 
oa 
* Read before the Botanical Club A. A. A. S., Washington meeting, August 22, 
18gr. 
