1913] COOPER—ISLE ROYALE 197 
Pond near Tobin’s Harbor (fig. 34; Sec. 5, T. 66 N., R. 33 W.).— 
This locality is closely similar to the last and occupies the same 
type of basin, with considerable bog forest at both ends. Develop- 
ment has proceeded one step farther, there being no open water, 
and the aquatics thus occupy the center. The sedge zone is con- 
tinuous and everywhere equally developed. Soundings through 
the mat showed that the slopes of the bottom on the northwest and 
southeast sides are not notably different. Carex filiformis is the 
principal mat-former. The other species contributing are Carex 
Fic. 35.—Same locality as fig. 34: Scirpus hudsonianus prominent in the sedge 
zone; salar of shrubs, Alnus incana surrounded by Chamaedaphne; a thick growth 
of bog trees at the end of the bas 
limosa L., C. chordorrhiza L. f., C. Michauxiana Boechl., C. livida 
(Wahlenb.) Willd., and C. polygama Schkuhr. The principal bog 
herbs accompanying the sedges are as follows: Menyanthes trifoliata 
L. (buckbean), Potentilla palustris (L.) Scop. (marsh cinquefoil), 
Vaccinium Oxycoccos L. var. intermedium Gray (cranberry), 
Rhynchospora alba (L.) Vahl (white beak-rush), Cicuta bulbifera L. 
(water hemlock), Hypericum virginicum L. (marsh St. Johnswort), 
Scirpus hudsonianus (Michx.) Fernald (alpine cotton-grass), 
Epilobium palustre L. (marsh willow-herb), Scutellaria galericulata 
