74 PLANT-LIFE 



tufts, and forms a narrow band, varying in width in 

 accordance with the slope of the shore, immediately 

 below high-water mark. A little lower we may find 



Fig. 22. — IY,at-Wi!.ack (Puctjs platycaeptjs). 



Flat- Wrack (Fucus platycarpus, Fig. 22), which has a 

 thallus about 6 inches long, or, in its absence, the next 

 species in the descending series will be the exceedingly 



Fig. 23,— Eladder-Wkack (Fucus vesiculosus). 



common Bladder-Wrack {Fucus vesiculosus, Fig. 23). 

 This species hardly needs description. It is easily 

 recognized by its good-sized, round air-vessels, swellings 



