WISCONSIN PHYTOPLANKTON 35 



COELOSPHAERIUM DUBiuM Grunow. PI. 3, Fig. 7. 



in Rabenhorst, Flora Eur. Algarum 2: 55. 1865; Schmula, Beibl. z. Hedwigla 

 37: (47), figs. 1-2. 1898. 



Colonies spherical to irregular, with three or four smaller colonies 

 frequently enclosed by a common gelatinous envelope. Colonial en- 

 velope firm, hyaline, and homogeneous. Cells in a single layer and 

 very close together at the periphery of the colonial envelope. Cell con- 

 tents homogeneous or with pseudovacuoles ; blue-green in color. (Fac- 

 ultative Planktont). 



Cells 5-7 p, in diameter. Single colonies up to 150 p in diam ; com- 

 pound colonies up to 300 /x. 



Mud (3) (rr). 



COELOSPHAERIUM NAEGELIANUM Unger. PI. 3, Fig. 6; PI. 4, Fig. 1. 



Denkschr. d. kais. Ak. d. Wiss. Wien 7: 196. 1854; Leitgeb, Mitt. d. naturw. 

 Ver. Steiermark 2, Heft 1: 72, pi. 2, figs. 1-6. 1869; Borge, Bot. Not. 1900: 

 10, pi. 1, figs. 5*-5b. 1900. 



GomphospJtaeria Naegeliana (Unger) Lemmermann. Kryptogamenfl. d. 

 Mark Brandenburg 3, Algen 1: 80, 44, fig. 19. 1907; Bachmann, Arch. f. Hy- 

 drobiol. u. Planktonkde. 3: 60, figs. IIP-III 6 . 1908. 



Colonies spherical, ovoid, renif orm or irregular ; with a wide, hyaline, 

 gelatinous envelope that is at times radially fibrillar in structure. Cells 

 ovoid to ellipsoid, radially arranged in a single layer some distance be- 

 neath the periphery of the colonial envelope, usually close together but 

 not mutually compressed. Cell contents rarely homogeneous and pale 

 to bright blue-green or grass-green ; usually with numerous pseudovacu- 

 oles and reddish to brownish in color. (Euplanktont). 



Cells 2-3 /x broad ; 3.5-6 /* long. 



Adelaide (ss), Amicoy (ss), Balsam (ss), Bear (1) (s), Bear (2) (rr), 

 Bear (3) (s), Bear Trap (sss), Beaverdam (cc), Big (ccc), Big Butternut 

 (r), Big McKenzie (ss), Big St. Germaine (rr), Birch (1) (ccc), Birch (2) 

 (aa), Birch Island (rrr), Blake (rr), Bloom (ss), Bone (ss), Boulder (rr), 

 Browns (rr), Camp (c), Catfish (aa), Center (aa), Chetac (aa), Clam (c), 

 Clare (rr), Crab (sss), Cranberry (aa), Devils (1) (rr), Devils (2) (ss), 

 Deer (rr), Duck (c), Dummy (rrr), Elizabeth (cc), Fish (sss), Found (ss). 

 Fowler (ss), Granite (ss), Grindstone (rr), Half Moon (s), Hillman (s). 

 Hooker (rr), Horseshoe (1) (ss), Horseshoe (2) (rrr), Island (cc), Jennie 

 (rr), Kawaguesaga (sss), Kitten (rrr), Kegonsa (aa), Lac du Flambeau (rr), 

 Lac la Belle (r), Laura (aa), Lindy (rr), Little Bass (2) (rr), Little Butter- 

 nut (rr), Little Rice (1) (cc), Long (1) (rr), Long (2) (a), Loon (rr), Lost 

 (aa), Lower Nemahbin (r), Marl (rr), Mendota (cc), Mercer (ss), Middle 

 McKenzie (cc), Mill (rr), Minocqua (rr), Monona (aa), Mud (1) (cc), Mud 

 (3) (aa), Mudhen (rr), Nancy (c), Nicaboyne (r), No Mans (aa), North 

 Twin (cc), North Turtle (aa), Number One (ss), Oconomowoc (rr), Okauchee 



