CoLLINs AND Howe: Spectres oF HALYMENIA 173 
peculiarities, the outline of the central node or ganglion in H. 
bermudensis is, when viewed through the cortex, more lobed, 
stellate, or brachiate, and less orbicular or rotate than in H. 
floridana. 
J. Agardh founded Halymenia floridana on several specimens 
sent to him from Florida by Mrs. Floretta C. Curtiss, and he 
appears to have put certain specimens of the same thing, or of 
the typical thing, in the ‘‘Kallymenia reniformis” cover in his 
herbarium. Specimens of it, collected by A. H. Curtiss at Gil- 
bert’s Bar, Florida, were distributed by Curtiss with a printed 
“Algae Floridanae” label under the name ‘‘Kallymenia reni- 
formis J. Ag.,” from which plant it differs greatly in structure. 
Halymenia floridana and H. bermudensis, however, differ from 
typical Halymenia (H. Floresia) in their firmer subparenchymatous 
cortex, in their much firmer, non-deliquescent and scarcely 
gelatinous outer walls of the superficial cells, and in the striking 
development of the medullary ganglia. It is possible, as has 
already been hinted by one of us,* that more critical studies, 
especially of the development of the cystocarps (abundant in 
Ht. floridana), may furnish adequate grounds for the establishment 
of a new generic group which would include not only Halymenta 
floridana and H. bermudensis but also the Peruvian Sebdenia 
heteronema. J. Agardh placed Halymenia floridana in his section 
Halarachnion of the genus Halymenia, and De-Toni} has ranged 
it, with a question mark, under the generic name Halarachnion, 
but the type of Halarachnion (H. ligulatum) has no medullary 
ganglia comparable with those of Halymenta floridana and it 
differs also in the structure of the cortex. 
Halymenia bermudensis may or may not adhere to paper when 
dried under pressure. 
Halymenia Gelinaria sp. nov. : 
_Thallo roseo-vinaceo vel vinaceo-purpureo, coohtele oak 
stipite a disco basali orto, inferne subtereti, superne A en 0; 
fronde plana, levi, nec nitente, membranacea vel 2 oe 
Plerumque maxime gelatinosa, 60-600 crassa, subor pel 
oblonga, ovata vel cuneato-obovata, latitudine 5 Cn. wee 
* Howe, Mem. Torrey Club 1§: 165. 1914- 
T Syll. Alg. 4: 1655. 1905. 
