WISCONSIN PHYTOPLANKTON 73 



DINOBRYON CALICIFORME Bachmann. PI. 13, Figs. 5-6. 

 Arch. f. Hydrob. u. Planktonkde. 3: 82, fig. XI". 1908. 



Cells solitary; epiphytic upon the gelatinous envelope of various 

 colonial Myxophyceae. Receptacles elongate conical, with a sharply 

 pointed base. Protoplast the same shape as the lower two-thirds of re- 

 ceptacle. Chromatophores two, laminate, parietal, and golden-brown 

 in color. Eyespot single. Cilia not as long as the cell. (Euplank- 

 tont). 



Receptacles 5-6 ^ broad at apex, 30-40 p long. 



Embedded in or on gelatinous envelope of Coelosphaeriwn Naegeli- 

 anum and Microcystis aeruginosa. 



Browns (sss). 



DINOBRYON TABELLARIAE (Lemmermann) Pascher. PI. 13, Figs. 7-9. 



Siisswasserfl. Deutschl., osterr. u. d. Schw. 2, Flagellatae 2: 66, flgs. 105*-105 b . 

 1913. 



Dinobryon utriculus var. tabellariae Lemmermann, Arkiv for Botanik 2, 

 No. 2: 119, pi. 1, fig. 19. 1904. 



Cells solitary; epiphytic upon filaments of Tabellaria. Receptacle 

 broadly spindle-shaped, with the base produced into a short stipe. Pro- 

 toplast attached to side of lower portion of receptacle, ovoid in shape 

 and with the usual contents of the genus. (Euplanktont). 



Receptacles 7-10 /* broad at center, 4-5 at apex ; 18-22 p long. 



Crawling , Stone (r), Long (3) (rr), Sand (4) (s). 



DINOBRYON BAVARICUM Imhof. PI. 13, Fig. 10. 



Zool. Anz. 13: 484. 1890; Lemmermann, Bot. Not. 1903: 78, pi. 3, flgs. 3-4. 

 1903. 



Cells in free-floating compact colonies. Receptacles of individual 

 cells elongate-conical. Base of receptacle very much produced with 

 sides almost parallel; expanded portion of receptacle with undulate 

 sides. Seasonal variation pronounced, the receptacles being much 

 longer during the summer. (Euplanktont). 



Receptacles 6.5-8.5 /* broad ; 45-100 /* long. 



George (ss), Harris (rr), Marl (ss), Oconomowoc (ss), Speese (ss), Tied 

 Canoe (ss), White Sand (s). 



^ * 



A< 







