1894,” Proceedings of Scientific Societies. 365 
Mr. Thos. Craig read a paper on A New Dictyospherium. 
In Wolle’s description of this genus he describes the cells as green, 
and egg or kidney shaped, united in a globose hollow family, involved 
in a gelatinous integument. 
He describes four species: D. ehrenbergianum Naeg., D. pulchellum 
Wood, D. reniforme Bulnh., and D. hitchcockii Wolle. The one under 
consideration does not agree in description with any of the above spe- 
cies. It was found along with other algae, tangled in the roots of water 
cress in a pond in the woods back of the Moravian Cemetery. 
Mr. Walter C. Kerr exhibited a carefully prepared drawing of the 
trunk of a red maple tree and read a paper on Aerial Roots on Acer 
rubrum, L. 
Near the brook flowing from Logan’s spring swamp east of Silver 
Lake stands a red maple, about fourteen inches in diameter, and on its 
north side the bark has been stripped, probably by splitting from a 
wound received while young, forming a bare triangular space extend- 
ing nearly across the base of the tree and having its apex thirty-six 
inches from the ground. The wounded bark has healed and its edges 
are covered with a smooth, gray, corky layer presenting the rounded 
appearance common to the edges of such scars. The wood being unin- 
jured remains in a good state of preservation, while the entire tree is 
in vigorous growth. 
It stands on a slight rise, about twenty-five feet south of the creek, 
ta rich, rocky, moist ground, within eight feet of a low spot, which, 
though swampy in the wet seasons, is never overflowed. 
The nearest trees are white oak and hop hornbeam, nine and fifteen 
feet distant, with no others within forty to fifty feet. Undergrowth is 
absent, and there is no reason to suppose that earth or stones have ever 
been heaped about it. It branches twenty feet from the ground and 
thus there are no conditions of darkness or exceptional moisture to 
encourage the development of aerial roots. 
About six inches below and to the right of the apex of the triangular 
wound there springs from the cambium of the healed bark two roots, 
each one-half inch in diameter. They extend downward across the 
“sear at an angle of about forty-five degrees; the upper being twelve 
inches and the lower seventeen inches long. They have decided root 
form and are covered with rootlets, the upper bearing about twenty 
and the lower about fifty, 
The development of rootlets proceeds almost wholly from the lower 
surface of the roots, their length being from two to twelve inches, 
many being about six inches long, and all profusely branched, while 
