RED ALG^. 187 



low, thickly, pinnately branched above. All the 

 lesser pinnules issue at very obtuse angles with 

 distinctly rounded axils. Color when growing is a 

 very dark purplish-red. Its size, the long primary 

 branches, and the rounded axils of its ultimate 

 branchlets, distinguish it from the last. It is very 

 common at all seasons, growing between tides, on 

 rocks and weeds. Mrs. Bingham finds it on the 

 stems of Phyllospora Menziesii at Santa Barbara. 

 At San Diego it grows in deep water and in deep 

 tide pools. It does not adhere to paper in drying. 



Gelididm coulteri, Harv. 



This is much the smallest and most delicate 

 species of the three. It grows in considerable tufts 

 from a mass of matted root-fibres, sometimes fifty 

 plants together. It is very slender and narrow, not 

 more than the twentieth of an inch wide, yet all 

 parts are clearly flattened, and the opposite pinnate 

 branching, goes on very regularly from the edges. 

 The fronds are commonly two or three inches high ; 

 the primary branches one to two inches long; the 

 secondary are usually the club-shaped ramuli which 

 contain the fruit, and are closely set and opposite. 

 Color, a very dark purple. It adheres to paper fairly 

 well. Beginning as a somewhat rare plant in San 



