56 
THE PLANT WORLD. 
folia differs from others by its scabrous leaves, which are merely 
acute instead of acuminate. 
Mr. Brown, just returned from Florida, related some interest¬ 
ing experiences on the keys. 
Dr. Britton drew attention to Cardamine dexuosa With, and 
spoke of its relation to C. Pennsylvanica, C. hirsuta and C. areni- 
cola and in its general aspect differing so considerably from other 
American forms. 
Dr. Waters reported typical Dryopteris spinulosa and its variety 
fructosa. He also obtained with little difficulty more individuals 
of proliferous Asplenium platyneuron, altogether some ten fronds. 
Dr. Britton gave an interesting account of Professor de Vries’ 
experiments on the genus Onagra and he suggested that perhaps 
the same principles could be applied to the genus Knieffia. 
Thursday morning was devoted to exploring Tucquan Gorge, 
two miles above McCall’s Ferry Station, and in the evening Mr. 
Stewardson Brown occupied the chair. 
Mr. Nash discussed the great number of panicums in the valley, 
notably P. polyanthes, P. sphaerocarpon, P. linearifolium, P. de- 
pauperatum, P. unciphyllum and at least two unnamed species. 
Uniola latifolia reaches its northern limit at this place. Mr. Nash 
also gave an enjoyable account of some of his recent Florida 
experiences. 
Other plants worthy of record found during the day were 
Ilysanthes attennata, Veronica scutellata, Scutellaria cor difolia, 
Meibomia Canadensis, Solidago Canadensis and var. glabrata and 
S. juncea. 
Friday was spent in retrospection by those who were able to 
remain. It soon came time to quench the council fires which had 
burned on Algonquin Rock. The hearty thanks of the visiting 
botanists were extended to their very genial and kind-hearted 
host and hostess, Mr. and Mrs. Elias W. Urey, who so cheerfully 
gave over their entire house to their disposal. 
Thus ended the first Symposium of Botany on the Susquehanna, 
which was adjourned to me;et about the same time in July of 1905 
in the Allegheny Mountains at Cresson, Pa. 
The following botanists were present. 
