HOW TO KNOW THE SEAWEEDS 



Atlantic and Pacific coasts. Most of the species of Gelidium are flat- 

 tened (step 185b), but the southern CaUfornia G. nudifrons and some 

 of the larger forms of G. ciinale are only slightly compressed as in- 

 dicated in the figures. 



Fig. 74. Gelidium nuditrons Gard- 

 ner 



A small portion of a plant about 

 18 cm. high to show the slender, 

 subcylindrical form and the rather 

 remote branches, X 0.8. Frequent 

 in southern California and some- 

 times abundant enough in the sub- 

 httoral Gelidium beds to be used 

 supplementarily for the making of 

 agar. 



Figure 74 



45b Medulla without rhizoidal filaments 46 



46a Branching distichous or more or less unilateral. Fig. 75 



MicTOcladia 



Fig. 75. MicTOcladia coulteri Harvey 



A small upper portion of a plant show- 

 ing the distichous branching of the slight- 

 ly compressed axes, X 3.2. Common along 

 the entire Pacific Coast, often together 

 with similar M. calif ornica Farlow. A third 

 species with unilateral branching, M. bore- 

 alis Ruprecht, occurs from central Cali- 

 fornia northward. 



Figure 75 



64 



