FLORWE^. 277 



Order Bhodomelem, at wliicli Dasya and Polynphonia are common 

 .genera. 



Order Chylocladiem, represented by only two Californian species. 



Order Sph^rococcoidea, represented abundantly by species Delemeria. 



Order OoralUnece, containing plants which are remarkable for the 

 ■large amount of calcium carbonate they contain. CoraUinais abundant. 



Order Oelidiece, represented by Gelidiwm. 



Order Hypnece, including only a few species of one genus Hypnea. 



Order BhodyTneniecB, of which Mhodymenia and Lomentaria are com- 

 mon genera. Rhodymenia palmaia, the ' ' Dulse " of our coasts, is used 

 as human food. 



Order Spongiocarp ce, with one species of Polyidea. 



Order Squamariem, with one species of Peyssonnelia. 



Order Batracliospermece, to which Nemalion (Fig. 185, B) belongs. 



Order Wrangeliem, with two species of Wrangelia. 



Order OijartinecB, of which Chondrua crispus, the Irish moss so 

 largely used for food, for making blanc mange, etc., is the best-known 

 of the many species on our coasts. 



Order Cryptonemiem, represented mainly on our Southern and Pacific 

 -coasts. ScMzynemia edulis, of Europe and our Western coasts, is 

 used as human food. 



Order Dwrnon iem, to which Haloaaccion of our Eastern coast belongs. 



Order Bpyridiem, represented by Spyridia of our Eastern coast. 



Order Ceramiece. This order contains algse " which are eitlier strictly 

 monosiphonous {i.e., composed of a single tube) and filiform, or which 

 are more simple in their structure than others, approaching in this re- 

 spect the Confefvacese. It abounds iu species which display the most 

 exquisite combination of ramification and coloring." A large portion 

 of our marine flora is composed of individuals of this order, as " they 

 -abound on our coasts in every little rocky pool, onevery piece of wood- 

 work exposed to the waves, on rocks and stones, and, above all, on the 

 fltems of the larger or firmer algae, or even on marine Plianerogams, 

 which they fringe iu the most exquisite way with every shade of red, 

 from a bright rose to purple. "f 



LejoUaia (A, Fig. 185) and Budreanaya (Fig. 186) are genera of this 

 order. Callithamnion is represented by many species on both our At- 



Report of the U. S. Fiah Oommiasioner for 1875. It is modified from 

 Thuret's arrangement. The arrangement of the orders and the group- 

 ing of genera into orders are not based upon sexual characters, and con- 

 sequently must be regarded as to a considerable extent artificial. The 

 first-named orders in the list are higher than those that follow. 



f " Introduction to Cryptogamic Botany," by M. J. Berkeley, 1857, p. 

 178. The student is also referred to Harvey's " Nereis Boreali-Ameri- 

 •cana," " "Contribution to a History of the Marine Algae of North 

 -America,'' published by the Smithsonian Institution, 1853 to 1858. 



