Cylindrocapsa conferta W. West 1892, p. 735 

 PI. 9, Figs. 5, 6 



Cells short, quadrate or quadrangular-ovate, enclosed by a wide 

 sheath of lamellate mucilage. Cells 20-26/x in diameter, 14-29/x 

 long; oogonia 41^ in diameter; fertilized egg 24/i, in diameter (with- 

 out envelope); male cells 18.5/i, wide, biseriate (often uniseriate in 

 our specimens). 



Among other algae in shallows, especially in soft water lakes. Wis. 

 (Previously reported from Iowa.) 



Cylindrocapsa geminella Wolle 1887, p. 104 

 PI. 9, Figs. 3, 4 



Filaments long, composed of ovate or oblong cells that are up to 

 twice their diameter in length; in copious, lamellate mucilage. 

 Chloroplast massive and usually obscured by starch grains. Cells 

 12-18/x in diameter, 18-30;a long; oogonia globose or pyriform- 

 globose, as much as 50/a in diameter (including the gelatinous 

 sheath), usually in a series of 3-9. 



This species is usually found entangled among other filamentous 

 algae; especially abundant in desmid habitats, such as acid swamps. 

 It is more common than other species of the genus in our collections. 

 Mich., Wis. 



Cylindrocapsa geminella var. minor Hansgirg 1888, p. 224 



PI. 9, Figs. 1, 2 

 A variety differing from the typical by its narrower cells and 

 smaller oogonia. Cells ovate or ellipsoid, 12-15.6/i. in diameter 

 (including the sheath), 18.5/x long; oogonia Sd/x in diameter; 

 oospore 29.2/x in diameter, 31.2ja long. Filaments sometimes twisted 

 and contorted. 



Entangled among and attached to other filamentous algae in small 

 ponds and swampy margins of lakes. Mich., Wis. 



ORDER SPHAEROPLEALES 



In this order there is but a single family, the Sphaeropleaceae, 

 and one genus, Sphaeroplea. The plant body is a long unbranched 

 filament of cylindrical 'cells,' without basal-distal differentiation. 

 Each 'cell' contains several cytoplasmic units separated from one 

 another by a large intervening vacuole. The cytoplasmic septae con- 

 tain several nuclei and usually many ovoid, disc-like chloroplasts 

 which are arranged to form zonate, annular bands. The chlorophyll- 



[110] 



