50 AMERICAN FERN JOURNAL 
dried material may be seen on the upper side of the 
leaf. In S. natans the leaves are elliptical, the trich- 
omes borne on low papillae, and the veins imbedded in 
the tissues of the leaf and very obscure. The variety ; 
Olfersiana differs from typical S. auriculata in havimg 
smaller and much thinner leaves (in dried material,— 
they are rather thick and fleshy in the living plant) 
with only 15-30 latera) veins on each side, and in the 
“much greater hairiness of all the submerged parts, 
including the sporocarps. It is possibly a distinct 
species, and is so treated by Britton in the Flora of 
Bermuda where there is an excellent figure which might 
easily have been drawn from the plant now growing 
at the University of Minnesota. 
Both S. auriculata and the variety are natives of 
tropical America, and there is no evidence that either 
of them will survive a northern winter in the open. 
Thus it becomes even more improbable that the sup- 
posed Minnesota plant is really a native of this state, 
or has ever lived there outside of greenhouses, except 
possibly as a brief-lived escape during the summer. 
University or MINNESOTA. 
OTHER Recorps or SALVINIA NATANS IN THE UNITED 
Stares.—Besides Minnesota, three other localities for 
Salvinia natans are given in current manuals. Some 
account of them may be of interest as a supplement to 
Professor Butters’s note. 
The earliest report of the species is in Pursh’s Flora 
of North America, where it is said to have been found 
“floating like Lemna on the surface of stagnant waters 
in several of the small lakes in the western part of New 
York.” No subsequent botanist has been able to find 
the plant in this region: we must conclude either that 
it did not become permanently established, or that it 
