WISCONSIN PHY TOPLAN ETON 115 



GLOEOTAENIUM Hansgirg 1890. 



Cells spherical, ovoid, or variously flattened; solitary or united in 

 colonies of 2-^4-8 cells enclosed by a non-expanded mother cell wall and 

 separated from one another by a dark colored gelatinous mass that lies 

 between the cells. Colonies rectangular, with rounded corners in front 

 view ; oblong with sharp corners in side view. Cell wall thick, distinctly 

 lamellated ; old cell wall enclosing the colony frequently with folds and 

 gelatinous discs opposite the cells. Chloroplast entirely filling cells; 

 with or without a pyrenoid. 



Reproduction by autospores and aplanospores. 



GLOEOTAENIUM LOITLESBERGERIANUM Hansgirg. PI. 23, Figs. 8-9. 



Sitzbr. d. k. bohm. Ges. d. Wiss. in Prag, Jahrgang 1890: 10. 1890; Transeau, 

 Bot. Gaz. 55: 66, pi. 3, figs. 1-24. 1913. 



Cells spherical to ovoid, completely filling the space inside of old 

 mother cell wall. (Tychoplanktont). 



Diam. cells 20-30 /*; length 2-celled colonies 40-70 /* breadth 22-40 /*; 

 thickness 20-30 p.. 4-celled colonies 40-70 /* broad, 40-80 /* long. 



Big Butternut (rrr). 



Sub-family TETRAEDREAE. 



Ceils always solitary, without a gelatinous envelope, flattened or 

 isodiametric, triangular, quadrangular, or polyangular; angles simple 

 or produced into spines or long hyaline setae. 



KEY TO THE GENERA. 



Cells simple or with fairly stout spines at angles TETRAEDRON 



Cells with long hyaline setae at angles POLYEDRIOPSIS 



TETRAEDRON Kiitzing 1845. 



Cells solitary, free-floating, flattened or isodiametric, triangular, 

 quadrangular, or polyangular. Angles simple or produced into simple 

 or furcate spines. Cell wall smooth or verrucose. Chloroplasts one to 

 many, parietal, discif orm to angular ; or completely filling the cell ; with 

 or without pyrenoids. 



Reproduction by division of cell contents into 4-8 autospores that 

 are liberated by the rupture of the old mother cell wall. 



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