Lake Maxinkuckee, Physical and Biological Survey 141 



ANNOTATED LISTS OF SPECIES 

 THE GREEN ALG^E, ETC. 



1. CHROCOCCUS TURGIDUS (Kuetz.) 



This is not a plankton alga, and occurs under such circum- 

 stances that it can not be obtained by wholesale methods. It was 

 obtained only once, in hand-gathered material along the shore of 

 the lake, along with such forms as CEdogonium, Bulbochsete, etc. 

 Its natural habitat is in springs, and it is probably fairly common 

 about the edges of the lake and the numerous springy places. 



2. GLOEOCAPSA MAGMA (Bieb.) 



Encountered only occasionally, especially in the stomachs of 

 mussels obtained along the shore of Lost Lake. 



3. GLOEOCAPSA POLYDERMATICA Kuetz. 



Forming a crinkled, gelatinous blue-green mass near Culver, 

 August 30, 1906. 



4. MICROCYSTIS AERUGINOSA Kuetz. 



This species, which is excessively abundant in Winona or Eagle 

 Lake, Kosciusko County, is rather scarce in the plankton of Lake 

 Maxinkuckee; a few colonies occasionally found in some of the 

 towings near shore. 



It is probably more abundant in Lost Lake a shallow lake with 

 muddy bottom more like Eagle Lake in character. A note of Sep- 

 tember 7, 1908, says: "It is this which makes an exceedingly fine 

 granular scum, easily thrown into fine lines ; abundant on Lost Lake 

 among rushes, and some on sand at the edge of the lake." It is 

 very abundant in some of the weedy lakes north of Lake Maxin- 

 kuckee. At the latter lake it is very frequently encountered as an 

 element of mussel food. This species is, perhaps, more widely 

 known under the name Clathrocystis, the question of names being 

 in this case a matter of opinion. West, with whose opinion we 

 concur, says, "the three genera, Microcystis, Polycystis and Clath- 

 rocystis, are not sufficiently distinct to warrant their separation. 

 The differences between them are only differences of degree." 



5. GOMPHOSPHAERIA APONINA Kuetz. 



Not frequently obtained in towings or hand-gathered material, 

 but a rather common element of the mussel food. The mussel 

 makes one of the most efficient substitutes that could be utilized for 

 a towing-net or plankton collector. 



