164 



the tip, become split as they grow older and are succeeded at the -; 



tip by nevv ones, and which finally disintegrate and disappear, lea- ; 



ving nodal scars on the stems to mark their position. The internodes i 



are several times longer than thick, but the exact proportion may | 



vary even in the same plant. Postels and Ruprecht state that they ^ 



are doublé the diameter, but that docs not appear to be Constant \ 



even in their own specimens which the writer has examined in the | 



Herbarium of the Imperiai Academy of Sciences in St. Petersburg. i| 



These specimens also agree with the figures of Gmelin and of Po- ^ 



STELS and Ruprecht in having the new laminae originate in a sort l 



of depression in the center of the old biade in a rosulate fashion. * 

 This is a point of very considerable importance in considering the 



possible idenlity of plants in this genus as will emphasized below. | 



Plants of the Luetke Expedition, sent out from the Academy of | 



Sciences under the name of C. rosa niarìna to other herbaria agree \ 



well with those retained. The writer has carefully examined such in the '\ 



Herb. J. G. Agardh at Lund, the Herb. W. II. IIarvey in Trinity ! 



College, Dublin, and in Herb. W. G. Farlow in Harvard University, \ 



Cambridge, Mass. The piate of Postels and Ruprecht (111. Algarum, * 



pi. XXX, 1840) also represents these plants very well. \ 



Having decided that Conslaiitinea rosa marina F^. et R. is to be 

 considered as identical with Fiicits rosa marina Gmelin, we may \ 

 turn our attention to the second species of the genus, C. Silchensis \ 

 P. et R., about which there has been unccrtainty and confusion. The ; 

 types of this species are three fragmentary specimens in the ller- 1 

 barium of the Imperiai Academy of Sciences at St, Petersburg, de- j 

 signated as of Expeditio Luetke and marked with the name of the \ 

 species, apparently in the hand of Rupkecht. It seems likely that j 

 these are ali the material collected, since the writer can (ìnd no | 

 trace of any specimens having been distributcd to any other Her- 

 baria. A careful examination of the types convinccs the writer that j 

 they show no differences from the plants referred by Postels and 

 Ruprecht to C. rosa marina. The stems, laminae, etc. are perfectly 

 matched and even the new biade arises by a rosulate process. The 

 habit of the plants of the two species is the same and these plants 

 do not seem even appreciably larger than the specimens which the 

 same authors refer to the type species of the genus. It seems to 



f^ 



