[From the Bulletin of the Torrby Botanical Club, 43: 169-182. 18 My 1916.] 



Notes on species of Halymenia 



F. S. Collins and M. A. Howe 



In connection with studies of a series of specimens of red algae 

 of the genus Halymenia from Bermuda, southern Florida, and 

 North Carolina, we have been forced to recognize as entitled to 

 specific rank four striking and apparently well-defined forms that 

 we are venturing to describe as new. One of these is related to 

 Halymenia floridana J. Ag., two find their closest afifinity in 

 H. Floresia (Clem.) Ag., and the fourth is allied toH. actinopliysa 

 M. A. Howe. Descriptions follow: 



Halymenia bermudensis sp. nov. 



Thallo violaceo-rubro, plerumque stipitato; stipite inferne 

 subtereti, superne complanato vel costato-alato, interdum ramoso, 

 plus minusve elongato; fronde membranacea, firma, levi, nee 

 nitente, 60-120 ;u crassa, suborbiculari, cordata vel obovata, 

 saepe, interdum repetite, lobata vel prolifera, divisionibus frondi 

 primariae conformibus; margine plana vel plicata, subintegra, 

 crenata, vel interdum irregulariter dentata; medulla frondis 

 subcompacta, inter fila tenuiora fills crassioribus stellatim radiatis 

 frequenter sparsis; strato corticali frondis series 1-3 cellularum 

 minorum monstrante; strato subcorticali series 1-3 cellularum 

 majorum monstrante; tetrasporangiis sparsis; cystocarpiis ignotis. 



Species H. fioridanae J. Ag. proxima, sed differt colore magis 



saturate violaceo-rubro, minus roseo, fronde magis dissecta, 



substantia firmiore, cortice crassiore, firmiore, saepe pleiostrO' 



matico. 



169 



