Contributions to the Life-History of 
Notothylas. 
BY 
DAVID M. MOTTIER, 
Associate Professor of Botany, Indiana University , Bloomington , US. A. 
With Plates XX and XXI. 
T HE genus Notothylas is represented in Indiana by two 
species, N. orbicularis , Sulliv. and N. melanosjpora , Sulliv. 
The former, according to Gray’s Manual 1 , is pretty widely 
distributed over the Eastern United States. 
Notothylas orbicularis , the species with which we are par- 
ticularly concerned here, grows abundantly upon damp, 
shady ground where the moisture is tolerably constant 
during the warmer parts of the year. Not infrequently were 
specimens found side by side with Anthoceros, the lobes of 
the thallus sometimes overlapping, so that it was often 
difficult to distinguish one from the other. However, Noto- 
thylas is of a paler green, the lobes of the thallus smaller and 
much more irregular than those of Anthoceros . 
This year, fruiting specimens were collected during the 
latter part of July and up to August 10, but these are more 
abundant from October until the plants are frozen in 
November, when almost every specimen appears to bear 
1 Revised Edition, p. 727. 
[ Annals of Botany, Vol. VIII. No. XXXII. December, 1894.] 
