234 BOTANICAL GAZETTE [ SEPTEMBER 
Mary A. NicHois: Studies in the development of the ascospores 
in certain Pyrenomycetes.—The paper contained an account of the 
early stages in the development of the ascigerous fruit in certain 
spheriaceous Pyrenomycetes. The observations relate specially 
to the question of sexuality, and point to the conclusion that a 
sexual process may be present in some member of the family 
and absent or very degenerate in others. Thus, in Ceratostoma 
brevirostre the origin of the ascospore is distinctly traceable toa 
_ fusion of differentiated gametes, while in Teichospora only pos- 
sible rudiments of antheridia are present. The successive stages 
from the formation of the oosphere to the maturation of the 
ascospore reveal a process of development somewhat different 
from any heretofore suggested, but analogous to the development 
in Sphzrotheca, as observed by Harper, and also somewhat sim- 
ilar to that in the Floridez. 
W. W. RowLeE: The stigma and pollen of Arisema—The 
paper described the andrcecium and gyncecium of Ansama 
triphyllum and A. Dracontium. The peculiarities noted were the 
consolidation of the stamens, the open style with the stigmatic 
papilla not only on the surface of the stigma but also on the 
inner surface of the tube and forming a stigma-like tuft on the 
inner surface of the ovary. The pollen in one case was found 
to have already germinated within the anthers, and the tubes had 
folded back and forth upon themselves. Other cases examined 
did not show the same growth. 
N. L. Brirron: Mores on the genus Amelanchier.— Among 
the eastern forms, 4. Canadensis can be distinguished easily 
from the rest, and is Appalachian and Canadian in distribution 
A. Canadensis obovalis belongs to the coast and Great Lakes) 
A. spicata is a very low mountain species; and A. rotund 
extends from Maine to the Saskatchewan. Among the eheaha : 
forms, A, alnifolia is reported from northern Michigan, but 1s 
occurrence so far east is doubtful, its eastern limit being pee 
from Nebraska to Manitoba; A. Utahensis ranges from Utah to 
