56 Proceedings of the Ohio State .icademy of Science. 



phaea was found in the summer of 1910 in the extreme south- 

 western portion of the meadow close to the shrubs. 



In the southwestern part of the meadow are numerous 

 shrub's scattered singly or in groups ; among these Dryopteris 

 thelypteris is very abundant. It is an invader from the shrub 

 zone. It occurs in other portions also where there has been a 

 general invasion from the shrub zone. Osmunda cinnamomea and 



Fig. 20. — Osnunula cinnamomea m utu open ijoy-meauow. 1 he strict nauit 

 and stunted leaves are typical. 



O. regalis are also invaders from the shrub zone. Of the two 

 the former is the more abundant and more generally distributed. 

 The greater number of the Rhus and Alnus shrubs in the 

 meadow are surrounded at the base by this fern. The presence 

 of these three ferns in the open bog is clearly a case of endurance 

 and not of congenial habitat and is a striking illustration of the 

 difference in the intensity of illumination and the greater satura- 



