276 Lake Maxinkuckee, Physical and Biological Survey 

 239. SWAMP OR DOWNY POPLAR 



POPULUS HETEROPHYLLA L. 



Confined to the borders of woodland ponds where it grows in 

 shallow water to about 2 feet in depth. In the region of the lake 

 it grows to the height of 40 or 50 feet. In some ponds its bark is 

 the favorite habitat of the bearded lichen, Usnea barbata, which 

 frequently hangs from it in large masses and bears large peltate cir- 

 cular apothecia. The only place about the lake where this poplar 

 is found is about the birch swamp. At Twin Lakes it is quite 

 common about ponds. The birch swamp trees were in flower by 

 April 23 and shedding ripe fruit by May 16, 1901, a period of a 

 little over three weeks. The leaves come out late in spring. 



240. LARGE-TOOTHED ASPEN 



POPULUS GRANDIDENTATA Michx. 



Not especially common. A clump of tall trees on the high bank 

 overlooking the lake just a little north of Murray's, and some 

 quite tall trees south of the lake by the Busart road, also a clump 

 on the west shore of the Outlet on a high bank. These trees are 

 quite brittle and where protecting trees are removed, break off 

 easily in high winds. In exposed places a clump of these trees is 

 usually plentifully intermingled with tall stubs of trees which have 

 been blown down, and these, on account of their soft wood and quick- 

 ness of decay by a sort of dry rot, are favorite places for the nest 

 cavities of the smaller woodpeckers and chickadees. The trees 

 by Murray's were noted in flower April 23, 1901, botH pistillate 

 and staminate flowers collected. By April 26 they were out of flower, 

 and by May 16, the fruit was ripe and some of the trees just leafing 

 out. In the autumn the leaves ripen to a golden yellow and are 

 shed in a short time. They were yellow and falling by Murray's 

 on the 25th of October. 



241. AMERICAN ASPEN; QUAKING ASP 



POPULUS TREMULOIDES Michx. 



Rather common in the region of the lake; more abundant in 

 rather moist sandy places, as about the edges of shallow upland 

 ponds. It also grows in the high and dry upland. Common, form- 

 ing a circle about ponds in Walley's woods, and growing on a bank 

 near Walley's large pond. Noted in flower April 6 ; seeds ripe by 

 May 16. 



Not in one or a few, but in many ways, not in a single season, 



