LIGULATE WOLFFIAS OF THE UNITED STATES. 105 
part by chains of cells which form the side walls of the air 
chambers. These’ air chambers are usually hexagonal, as 
are also the epidermal cells — both slightly elongated in 
the direction of the longer axis of the frond. Uniformly 
scattered over both surfaces are pigment cells which differ 
from the surrounding epidermal cells in their smaller size 
and thicker walls and their yellowish-brown color and the 
granular appearance of their contents (pl. 64, f. 8.) The 
stipe, at the point where it was formerly attached to the 
parent plant, is composed wholly of chains of elongated 
prismatic cells which spread out fan-like toward the body 
of the frond, and in so doing present all gradations of cell- 
form from the prismatic at the stipe scar to the regular 
hexagonal form of the epidermis; however a few chains 
of the elongated cells extend unbroken to the base of the 
pouch where the budding takes place, and here connect with 
the stipes of the offspring, thus forming continuous chains 
throughout the generations. They too contain pigment 
cells. In this species this bundle of chains, or ‘ costa,”’ 
as Smith terms it, seems to occupy a position at the left side 
of the pocket — looking from above — within the line of 
juncture of the two walls of the pouch.* 
The finding of this variety adds an interesting item to the 
geographical distribution of plants, since heretofore it is 
reported only from a few stations in Florida, yet in the 
light of recent discoveries of many representative Florida 
plants — Leitneria Floridana, etc, — growing in the 
swampy regions of southeastern Missouri, it is not surpris- 
ing that the list should receive additional genera. 
The plants examined were collected in Dunklin County, 
Missouri.— By Mr. B. F. Bush, from the Varner river near | 
* Here arises the question whether the stipe is always to the left or 
not. This I have found to be true in all my examinations of living 
material, though they were too limited to venture a positive assertion to 
that effect. Dry plants could give me no aid on this point since in them 
it seems impossible to determine which is the upper and which the lower 
surface of the frond. 
