HOW TO KNOW THE SEAWEEDS 



173a Mediilla with small cells between the large ones. Fig. 216, 217. 



Callophyllis 



Fig. 216. Callophyllis sp. 



Part of a transection of a blade 

 to show the structure of the medul- 

 la in which large and small cells 

 are intermixed. 



Figure 216 



Fig. 217. Callophyllis 

 marginihucta Setchell 

 & Swezy 



A small upper portion 

 of a cystocarpic plant 

 to show the flabellate 

 branching habit and the 

 marginal cystocarps, X 

 1. This species, occur- 

 ring from central Ore- 

 gon to southern Cah- 

 fornia, is a member of 

 a common genus on our 

 Pacific Coast of which 

 seventeen species may 

 be collected in drift or 

 at low intertidal levels. 

 They are of moderate 

 size, up to 30 cm., and 

 vary widely within the 

 general pattern of dich- 

 otomo - flabellate form. 

 Most of them are bright reddish in color and may be made into some 

 of the most striking and attractive herbarium specimens. In most spe- 

 cies the cystocarps are not marginal, but are scattered over the flat 

 faces of the blades. Until recently it was virtually impossible for the 

 layman to identify the many species of Callophyllis, but now the writer 

 has published a series of illustrations of all of the Pacific Coast species 

 with which the student may quite readily identify many of his speci- 

 mens by the process of matching. (Marine Red Algae of Pacific Mexico. 

 A. Hancock Pacific Expeditions 17: 1-397. 1953-54.) 



Figure 217 



163 



