160 SEAWEEDS 
Fic. 47.—Dictyosphwria favulosa. a, b, ¢, young specimens; d, diagram of 
cells joined by haptera; e, haptera in side and surface views; f, D. sericea, 
surface view of frond ; g, bordering cells with haptera; h, internal projections 
from cell-walls of D. fuvulosa. Variously magnified. (Ex. Phyc. Mem). 
branched type, which leads on to forms with a higher 
differentiation of thallus. In <Apjohknia there is a 
main stalk with numerous rugose constrictions and 
