Lake Maxinkuckee, Physical and Biological Survey 257 



common in ponds and ditches in Green's marsh. The sheltered 

 waters near the Inlet seem to be its favorite location. Most other 

 parts of the lake are open to too much disturbance by winds and 

 waves for it to thrive. It is occasionally found in sheltered 

 places among the rushes along- shore, as north of Long Point and 

 the ice-houses, Winfield's and Overmyer's. These are probably 

 stray plants that have been blown and drifted from the main col- 

 ony. The numerous holes in the Inlet marsh are also covered by 

 this plant. 



In 1909, the duckweed scum was not so extensive at the Inlet 

 as formerly, but there was considerable in Aubeenaubee Bay di- 

 rectly across the lake, and near the Academy grounds. A season 

 of south winds had probably drifted the mass across the lake. 



We have no note of having found this plant in blossom. With 

 the other duckweeds it sinks to the bottom in late autumn and re- 

 mains green all winter, reappearing again with the thawing of 

 the ice. 



175. IVY-LEAVED DUCKWEED 



LKMNA TRISULCA L. 



Not especially common at the lake. Found on the lake shore 

 east of Farrar's, in a driedup pond southwest of the lake by 

 the boathouse near the Inlet, and most abundantly in the im- 

 mediate neighborhood of the Inlet, where it may be found at all 

 seasons when there is no ice; found also occasionally along shore 

 among cattails and rushes in the neighborhood of Winfield's. On 

 October 24, 1900, an immense mass of this species was found 

 drifted in Lost Lake near the middle of the western shore. This 

 formed a thick tangled scum extending out some distance from 

 shore and also making great masses in the bottom. It was also fre- 

 quently found growing and thriving well in wet places among dead 

 leaves in the water, and it appears to hibernate in such places. 



This little plant, with its elongate semi-transparent green fronds, 

 and peculiar manner of branching, is one of the most attractive of 

 the duckweeds. Each frond gives rise to a side-shoot on each side 

 at its center, resulting in a very regular but intricate and compli- 

 cated branching system where conditions are favorable, the fronds 

 tilting at all angles to avoid interference. It grows much more 

 vigorously under leaves in shallow water than in unprotected situa- 

 tions and hardly looks like the same plant, being much more robust 

 but retaining the same general habit. 



Not found in flower or fruit. It hibernates in the bottom and 

 remains green all winter. 



17— 17618— Vol. i 



