OF ARTS AND SCIENCES. 245 



Callithamnion heteromorphum J. Ag. Califonia. 

 Chantransia efflorescens, Thuret. {Gallithamnion Ag.). On 

 Rhodymenia. Gay Head, Mass. 



DESCRIPTION OF A NEW ALGA OF CALIFORNIA. 

 By Prof. Daniel C. Eaton, of Yale College. 



NiTOPHYLLUM SPECTABiLE, fronde subsessili, erecta, maxima, eco- 

 stata atque ut videtur avenia, oblonga, profunde pinnati-lobata ; parte 

 media duple vel triple latitudiue loborum, ssepe in lobum terminalem 

 magnam producta ; lobis laciniisve crebris, patulis, liguliformibus 

 sa-pius integris, nunc apice lobatis vel profundius partitis, margiue 

 vix undulata, rarissime phylla minima obovata e margine vel e disco 

 emittentibus ; soris et coccidiis per totam froudem creberrime con- 

 spersis. 



Hab. ad Sanctam Crucem, California: legit Anderson, Aug.- 

 Sept. 1874. 



Among the largest species of the genus, often two feet long, or even 

 longer, and, in the spread of the lobes, two-thirds as broad. The lobes are 

 so crowded as to overlap each other, and are 6-8 inches long and about 

 an inch wide, lanceolate or strap-shaped, rather obtuse, mostly entire, 

 but now and then two to three forked, or slighily dichotomously lobed. 

 One specimen bears numerous minute obovate prolifications along the 

 margin, and sparingly on the disk, especially where there has been 

 some injury. No veins visible. The tetraspores are in oblong or 

 irregular sori, thickly scattered all over the frond ; and in the fruiting, 

 plant mature and young coccidia are sprinkled with almost equal pro- 

 fusion. The substance is rather firm, but thin, and not adhering very 

 well to paper, except in the younger portions. I find but two layers 

 of cells in the sterile portions of the lamina. The color is a dull pur- 

 plish-red, more rosy in the newer portions. 



