HOW TO KNOW THE FRESH-WATER ALGAE 



121a (117) Cells attached, either sessile or on a stalk 122 



121b Cells free-floating or forming a film on moist earth 126 



122a Cells bearing a seta or hair 123 



122b Cells without setae 124 



123a Setae simple (unbranched). See Fig. 62 . . CHAETOSPHAERIDIUM 

 123b Setae branched. See Fig. 61 D1CRANOCHAETE 



124a Cells on a slender stalk or with the basal portions of the cell 

 narrowed to form a stalk 125 



124b Cells globular, attached by a broad, short stalk. Fig. 95 



MALLEOCHLORIS 



Fig. 95. Malleochloris sessilis Pascher (redrawn from 

 Pascher). 



This rare plant is to be sought on filamentous algae 

 such as members of the Cladophoraceae. The sheath 

 that incloses the cell is often reddish. Reproduction 

 (similar to other Tetrasporales) is by swimming spores 

 and by isogametes. 



Figure 95 



125a Cells globular, with chloroplast lying along the outer free wall; 



growing on Anabaena or CoeJosphaerium. Fig. 96 



STYLOSPHAER1D1UM 



Fig. 96. Stylosphaeridium stipitatum (Bach.) Geit. <& 

 Gimesi, a, habit of cells in colonial mucilage of Coelo- 

 sphaerium; b, single cells showing apical position of 

 chloroplast. 



This curious epiphyte is found in abundance when 



it occurs at all as minute "hat pins" in the mucilage 



•?"'i?S °* co l° ma l blue-green algae such as Coelosphaerium. 



Sjfc (Fig. 319.) 



'Ooo^o 

 o O 



Figure 96 



67 



