HOW TO KNOW THE SEAWEEDS 



154a Blades with proliferations from the margins. Fig. 194 



Grateloupia (in part) 



Fig. 194. Grateloupia schizophylla Kiitzing 



A single blade of a young plant, X 0.48. 

 This is a common species along the entire 

 Pacific Coast, but its blades may be either 

 entire or proliferous, so that it may key out 

 under step 158a. Plants may reach a length 

 of three feet or more. 



The genus contains species of varied sire 

 and morphology, some of local distribution and 

 some of very wide distribution. Abundantly 

 branched species Hke G. {ilicina key out at 

 step 188b, while broad, simple forms Hke G. 

 maxima key out at step 158a. 



Figure 194 



154b Blades without proliferations from the margins 155 



155a Cortex with gland cells: Fig. 195 Schizymenia paciiica 



Fig. 195. Schizymenia paciiica (Kylin) Ky- 



Un 



Part of a transection of a blade to show 

 the gland cells of the cortex and the slen- 

 der, interlaced filaments of the medulla, 

 X 224. This species is a frequent, broad, 

 membranous red alga along the entire 

 Pacific Coast. Its simple, or lobed, short- 

 stipitate blades do not show any external 

 characters satisfactory to distinguish the 

 plant from other similar membranous al- 

 gae such as Halymenia, Cryptonemia, Grjr- 

 teloupia, Rhodoglossum, etc., and it will be 

 found most practical to use the presence 

 of the usually conspicuous large gland 

 cells foj its recognition. 



Figure 195 



150 



