Chlorococcum humicola (Naeg. ) Rabenhorst 1868, p. 58 



PI. 45, Fig. 1 



Cells spherical, solitary or in small clumps, variable in size within 

 the same plant mass; cells 8-20- (25) /a in diameter. 



This species is luxuriantly represented on and about dead fish 

 and animal wastes along shores, forming green films in association 

 with Scenedesmus spp. and Euglena spp. Common on beach soils 

 and in moist aerial habitats. Mich., Wis. 



Without a doubt, another common species, C. infusionum 

 (Schrank) Meneghini occurs in our region. It has larger cells than 

 C. humicola (15-45/i. in diameter) and is ordinarily found on sub- 

 merged substrates. 



DESMATRACTUM ( West & West ) Pascher 1930b, p. 651 



Cells globular, the wall thin, firm, and smooth, inclosed in a wide, 

 transparent or brownish spindle-shaped sheath which is longitud- 

 inally striated; and composed of 2 top-shaped halves which adjoin 

 at the midregion of the spindle; chloroplast solitary, a parietal cup 

 with 1 or 2 pyrenoids; reproduction by biflagellate zoospores or by 

 autospores. 



This genus, as Bernardinella, was once placed in the Heterokontae. 



Desmatractum bipyramidatum ( Chod. ) Pascher 1930b, p. 654 



PL 46, Fig. 9 

 Characteristics as described for the genus; cells ( with sheath ) 12/i, 

 in diameter, 22/a long. 



In acid waters; Sphagnum bogs. Mich. 



ACANTHOSPHAERA Lemmermann 1899a, p. 118 

 Unicellular, spherical; free-floating; wall uniformly beset with 

 24 long, needle-like setae arranged in 6 tiers, 4 in each tier, about 

 the cell wall; setae thickened for about Vs their length from the base, 

 then abruptly narrowed to form slender spines; 1 parietal, lobed 

 chloroplast, covering most of the cell wall, with 1 pyrenoid. 



Acanthosphaera Zachariasi Lemmermann 1899a, p. 118 



PI. 45, Figs. 4, 5 

 Characteristics as described for the genus; cells spherical with 

 numerous long setae with thickened bases; cells 9-14.5/1 in diameter 

 without setae; length of setae 30-35)U,. 

 In plankton. Wis. 



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