RED ALGsE. 199 



are longest in old parts of the frond, and gradually 

 shorten towards the ends of the branches, till at last 

 they appear under the lens, like a string of very small 

 beads. 



In other than the normal forms, these constrictions 

 are not apparent except to a microscopical examination. 

 The beginner is advised to put doubtful cases aside, 

 and wait till a greater familiarity with the species 

 enables him to be sure of them. I have found the 

 typical forms to be mostly of a brownish purple color, 

 darker on paper, while many of the others are of a 

 decidedly pale green, touched with whitish yellow in 

 spots, with perhaps here and there brown branches 

 intermingled. It is a deep water plant, and may be 

 got through the warm season. 



Genus.— L OMENTARL 1, Lyngb. 



This genus is represented by two not very common 

 species on our eastern coast, but one of which, how- 



r, is of sufficient importance to come within the 

 scope of this book. 



I- .n makia Raima \\ \. 1 [ \rv. 



This is a very beautiful little plant, growing in 

 globose tufts, two or three inches high. It is of a 



