HOW TO KNOW THE FRESH-WATER ALGAE 



218a Cells in tubes which are attached to microfauna. See Fig. 64. 

 COLACIUM 



218b Cells not attached to microfauna 219 



219a Cells elongate-oval; brackish water or marine. Fig. 156 



PRASINOCLADUS 



Fig. 156. Prasinocladus lubricus Kuck. 



Although essentially marine this species has been 

 known to occur in brackish water. It is an attached, 

 branching tube composed of a series of compartments, 

 forming a tree-like thallus, in which the oval proto- 

 plasts occur only at the tips of the branches. There 

 is one chloroplast at the forward end of the cell which 

 actually is the posterior pole because like some of its 

 relatives (Malleochloris, Fig. 95) the cells are in an 

 inverted position with the anterior end downward. 



Figure 156 



219b Cells round, not in brackish water habitats 



220 



220a Cells in 1 series or in several irregular series within simple or 



branched tubes; chloroplasts 2 laminate. See Fig. 45 



PALMODICTYON 



220b Cells in several series, arranged in clusters of 4 in an irregularly 

 shaped, elongate strand of mucilage; chloroplast 1, a parietal cup. 

 See Fig. 35 TETRASPORA 



100 



