1896 | BOTANICAL PAPERS AT BUFFALO 221 
A peculiar transformation sometimes occurs in this same 
species, which gives rise to the form Osmunda cinnamomea fron- 
dosa. My attention was first called to this by Mr. C. D, McLouth 
of Muskegon, Mich., who has furnished me with considerable 
material. The transformation is peculiar, in that it appears to 
be an increase in the leaf surface along the mid-vein of the spo- 
rophyll, and also along the mid-vein of the pinnz, so that the 
sporangia are borne on wing-like expansions. The locality 
where these forms were collected gave evidence of a fire, either 
in the late autumn or early spring, and the forms were very 
marked and abundant near dead stumps where the fire was the 
hottest. Since at this season of the year the sporangia are nearly 
all formed, the nature of the transformation would be different 
from what it would be if the vegetative leaves were destroyed 
during midsummer, when the sporophyll was in the incipient 
stages of development. It is also possible that the heat pene- 
trated far into the stem of the plant and may have introduced 
disturbing factors of quite a different nature from that of the 
loss of the carbon assimilating members, which results when the 
leaves only are cut away. 
Experiments at different seasons will be conducted in the 
hope of arriving at the fundamental laws operating in these 
) nates, A large number of lantern slides made from photographs 
illustrated the paper. 
yt: Bauer : The philosophy of species making. — This paper 
will be published in full in an early number of the BoTANICAL 
Gazerrr. 
SECTION G OF THE A. A. A. S. 
CO ee MacDoveat : The relation of the growth of leaves to the 
2 of the ar— The leaves of seedlings accomplish a large pro- 
“apa their development but not always their entire develop- 
develo oe expense of food derived from the seed. Rapidly 
food Ping but small leaves furnished with large stores of reserve 
8 lags carry out a complete development, but are 
