366 



Fig. 358. Rhabdonia ramosissima (Harv.) J. Ag. 



Part of the tissue showing a carpogonial and 



an auxiliary-cell branch. (About 350:1) 



of the plantshow that 

 it is constructed in a 

 way similar to that of 

 Agardhiella. 



Also the carpogonial 

 branch and the branch 

 bearing the auxiliary cell 

 are, as Fig. 358 shows, 

 formed in accordance with 

 those found in Agardhiella. 

 Both are formed from 

 cells of the filaments at 

 the interior wall of the 

 peripheral tissue. The car- 

 pogonial branch consists 

 of three cells; the thrichogyne is long, spirally bent and flattened 

 in the upper end. The auxiliary cell bears three sterile ones. I have 

 not been able to follow the development of the cystocarp in the 

 material brought home by me. 



The tetrasporangia are formed in the peripheral tissue and are 

 zonately divided. 



Plants with tetrasporangia and cystocarps were gathered in 

 the month of March. 



The plant was dredged in the more open sea in depth of about 



10 15 fathoms. It was found rather sporadic and not in great number. 



Some fragments of a nearly terete plant answering, as it seems, 



to the description of the forma Harvey ana 3. Ag., 1. c., were once 



dredged. 



St. Jan: In several places off Cruz Bay, off America Hill, off Anna- 

 berg. 



Geogr. Distrib.: Key West. 



Eucheuma J. Ag. 



1. Eucheuma isiforine (Ag.) J. Ag. 



AGARDH, J., Nya alger fran Mexico (Ofvers. K. Vet.-Akad. Forh.. 

 1847, p. 16); Species Alg., vol. II, p. 627; Epicr., p. 600. HARVEY, Nereis 

 Bor.-Am., p. 118, tab. 24. 



Sphserococcus isiformis Ag., Spec. Alg., p. 271. KITZING, Spec. Alg., 

 p. 777. 



