148 Lake Maxinkuckee, Physical and Biological Survey 



Apstein (Siisswasserplankton, p. 136) gives a figure and notes 

 on the life history of this species. He found it abundant in various 

 places examined. He says nothing of its being eaten by pelagic 

 organisms. In his description of its wintering over he says : "At 

 the end of summer the spores are formed in abundance, which sink 

 to the bottom and here rest until the next spring. Many are 

 naturally eaten by the animals of the bottom, since in them the 

 nutritiveness is much concentrated." 



His figure shows numerous Vorticellas intermixed with the fila- 

 ments; it is probable that the same relation exists between them 

 here as above noted. 



20. ANABSENA STAGNALIS Kuetzing 



Common in a red film or scum coating the wet shore by Chad- 

 wick's, August 13, 1906, along with Spirulina jenneri and Proto- 

 coccus. Some of the filaments were much knotted and coiled. 



21. ANAB^ENA SACCATA (Wolle) 



Off Assembly grounds, August 8, 1906, collected by hand ; form- 

 ing finger-like lobate blue-green masses in great abundance in shal- 

 low water near shore. Quite unlike the other species of Anabsena, 

 and put in a different genus by different authors, West in 

 Anabsena, Wolle in Sphserozyga, and Bornet and Flahault in the 

 genus Wollea. 



22. NOSTOC VERRUCOSUM Vaucher 



Not a plankton alga, but represented by hand-gathered mate- 

 rial. Green's marsh and the quaking, boggy plain west of Lost 

 Lake contained an abundance of Nostoc in the form of beads of 

 blue-green, at times almost black, firm jelly ranging from the size 

 of a pinhead up to nearly the size of a hazelnut. On March 23, 

 1901, a film of this material was noted in Green's marsh, and on 

 March 25 in the same place old Nostoc balls were noted shrivelled 

 up, looking much like dried grapes. Almost any time of the year 

 these globular colonies of Nostoc can be found in abundance near 

 the moist base of grasses and sedges in the flat, sedgy plains about 

 the lake. 



23. TOLYPOTHRIX TENUIS Kuetzing 



Not a plankton alga, and not obtained in the lake, but procured 

 in the bottom of the woodland ponds, along with Draparnaldia, 

 Tetraspora, etc., in hand-gathered material. Probably common in 

 the woodland ponds where algse of many forms luxiuriate on the 

 bed of old leaves forming the bottom of the pools. 



