RED ALG^E. 255 



rowly, till it comes about that there is quite a bushy, 

 fan-shaped, level-topped plant, all derived from the 

 simple beginning of a slender, single-celled thread. 



It grows on Zostera, and other plants below tide 

 marks. It has a beautiful rosy color, is very soft 

 and fragile, and adheres firmly to paper. In mount- 

 ing, it should not at first be put under much pres- 

 sure ; nor should it be " floated " in fresh water, 

 else it will discharge its pink color. Miss Booth 

 finds it in abundance at Orient, in July and August. 

 It will be found on most shores south of Cape Cod. 

 If it occurs at all in the waters of Massachusetts 

 Bay, it must be as a great rarity, for neither my 

 correspondents nor myself have ever found it there. 



Genus.— CALLITHAMNJON* Lyngo, 



This is a large genus, of very beautiful plants, 

 numbering over twenty species in our flora. In 

 structure, they are the simplest of the red Algae, and 

 have what is deemed to be the most primitive method 

 of reproduction. The frond consists of a series of 

 single cells, put end to end, stem and branches 

 being alike in this regard. In some species, however, 



* Callithamnion = A beautiful shrub. 



