72 Proceedings of the Ohio State Academy of Science. 



4-4^ feet tall, thrifty but sterile. In the outer margin of the 

 zone is a thin ground cover of Sphagnum. 



V. Gaylussacia association : The association covers a zone 

 18 feet wide and consists of a dense growth of Gaylussacia res- 

 inosa with but few associated species which are : small Aronia 

 arbutifolia, Alnus rugosa, Osmunda cinnamomea and a thin 

 ground cover of Sphagnum cymbi folium, S. acutifolium var. 

 versicolor, Aulocomnium palustre and Oxycoccus macrocarpus. 

 The zone consists of two small mounds separated by a narrow 

 ditch and seems to have been formed by two clumps of Gaylus- 

 sacia meeting at and finally overgrowing the ditch. At the base 

 of the first mound the Gaylussacia are no taller than the Oxy- 

 coccus but increase in height to 30 inches in the center of the 

 mound. The mound bordering the shrub zone shows a more 

 luxuriant growth and the plants bordering zone IV attain 3 feet. 



This is the first year I have found these plants blossoming 

 and forming fruit. The few Alnus are weak, stunted plants, 

 with the main branch dead. One Alnus at the eastern margin 

 of the zone, is a tall shrub. The Aronias are but a few inches 

 taller than the Gaylussacia and but one bears a few fruits. The 

 Osmunda has the strict habit and short leaves characteristic of 

 this fern in the open bog. The ground underneath is dry and the 

 Sphagnum which grows well at the margin of the zone and the 

 western edge of the ditch is almost wanting in the center. This 

 ditch was evidently a path and is now filled with dry leaves. 

 On the southern slope of the first mound are a few small Po- 

 gonia ophioglossoides and Triadenum virginicum not in blos- 

 som. 



VI. A narrow, \ foot wide, transitional zone, where the 

 Sphagnum of the bog-meadow is beginning to form the mound 

 of the Heath zone: The zone is occupied by a Sphagnum-Oxy- 

 coccus society. The Oxycoccus shows luxuriant growth and 

 there is a scattering 6f two-year old Gaylussacia resinosa, 3-10 

 inches taller than the Sphagnum and which are not seedlings but 

 shoots from underground stems that have spread out from the 

 Gaylussacia plants. 



