Occasional Papers of the Museuui of Zoology 13 



which frequently disappear under the ground. Fallen trees 

 and decaying logs on the ground make a thick tangle, very 

 difficult to penetrate. The underbrush is scanty ; mountain 

 maple is rather common, and there are a few young black 

 ashes. Much moss grows on the ground and on the decaying 

 logs. 



In a depression two miles south of Little Girl's Point is a 

 mixed growth of arbor-vitae, black spruce, with a few black 

 ashes. The trees are mostly small, none of them exceeding 

 about eight inches in trunk diameter. In August the ground 

 was very wet, there being standing water in some places, and 

 the ground ^^'as heavily covered with sphagnum. This situa- 

 tion may be considered transitional between the black spruce 

 hog and the arbor-vitae swamp. Xo traps for mammals were 

 set in this situation. 



Bogs 



Leather leaf bog habitat: In the northwestern corner of 

 Fish-hawk Lake and at several places along the channel con- 

 necting Lindsley and Cisco lakes a heavy growth of leather 

 leaf (Chamaedaphne calycidata) adjoins and overhangs the 

 water, a considerable portion of the growth actually floating 

 on the water. With the leather leaf is associated much sweet 

 gale {Myrica gale) and alders, and these plants form almost 

 the entire mat in some of the wetter areas. At other places 

 sphagnum becomes abundant and the conditions approach 

 those of a sphagnum bog. Other plants commonly found in 

 the leather leaf bog in the Cisco Lake Region are the Labrador 

 tea (Ledum groenlandicwn) , swamp laurel (Kalinia potifo- 

 Ha), wild rosemary {Andromeda glaiicophylla), small cran- 

 berry (O.vycoccus oxycoccns), pitcher-plant {Sarracenia pur- 

 purea), and small trees of black spruce and tamarack. In a 

 typical leather leaf bog on the Ontonagon River near the out- 



