HOW TO KNOW THE SEAWEEDS 



94a Axes and (or) branches 2-5 mm. in diameter; cortex, as seen in 

 transection, composed of anticlinally arranged, branched filaments 

 of short cells. Fig. 129 Dumontia incrassata 



Figure 129 



Fig. 129. Dumontia incrassata (Miiller) Lamouroux 



An entire, medium size plant, X 1, showing the hollow branches 

 of rather large diameter. Grows in tide pools or just below low tide 

 level along the New England coast from Rhode Island northward. The 

 species is especially interesting in that it apparently was introduced 

 to the New England coast and became estabUshed only a few decades 

 ago. The first collection was made at South Harpswell, Maine in June, 

 1913. Since then it has been found more and more commonly at a 

 number of locaUties from Rhode Island to Nova Scotia. 



98 



