210 



PRACTICAL BOTANY 



There are no known unicellular red algae. Usually the plants 

 are quite complex and present expanded leaf-like structures 



FIG. 173. A red alga (Gigartina spinosa) 

 Attached by means of its holdfast to a small stone 



(Fig. 173) or are extensively branched (Fig. 174). They have 

 basal holdfasts, which in general resemble those usually found 

 in the brown algse. Red algse are, as a rule, smaller and 



