262 THE MARINE ALG^ OF SOUTH CAEOLINA AND FLOKIDA. 



55. Delesseria tenuifolia, Haw. Key West. 



56. Delesseria Leprieuriiy Mont. Ashley River, Charleston. In 

 brackish water, growing upon steins of the grass S'p art ina glabra. 



57. Gracilaria multipartita, Ag. The common Alga of the break- 

 water on Sullivan's Island, South Carolina, taking the place of 

 Chondrus crispus in the north. 



The var. angustissiina I obtained from the harbour, Charleston. 



58. Gracilaria Poitei, Lmx. Key West. Common. 



59. Gracilaria compressa, Grev. ? Key West. I also obtained two 

 specimens of a Gracilaria referred by Prof. J. G. Agardh to a place 

 " prope G. damcecornisp this latter being an inhabitant of the Arctic 

 regions. 



Gelidiace(B. 



60. Gelidiiim corneum, Lmx., var. crinah. Sullivan's Island, 

 Charleston. A small fragment picked up at Key West is also probably 

 referable to this species ; it has not hitherto been observed in Florida. 



61. Wurdemania setacea,lS.d,\:\. ]N"ot uncommon. Key West. 



62. Eucheuma isiforme, J. Ag. Yery common at Key West 

 after stormy weather ; thrown up from deeper water. 



63. Eucheuma acantJiocladum, Harv. This species has been till now 

 known as Clirysymenia acajithoclada, Harv., who describes it as being 

 rare at Key West. I obtained six specimens only, and quote the follow- 

 ing from a letter of Prof. Agardh's, dated December 3rd, 1873 : — " This 

 plant was quite new to me, and was of so much more interest as from 

 the description and figure in the ' jS'ereis Americana ' I imagined it 

 could hardly be a true species of Chrysymenia. By the analysis made 

 I am sure it is an Eucheuma, although no fruit is known." 



64. Hypnea musciformis, Lmx. Charleston, about Mount Pleasant 

 and Sullivan's Island, South Carolina; Key West, South Florida. 

 Very variable. 



65. Hypnea cornuta, J. Ag. One specimen ; Key West. 



Besides are several fragmentary specimens of another Hypnea from 

 Key West, hardly determinable. 



66. Peyssonnelia Dubyiy Crouan. Key West. 



Helminthocladiece. 



67. Helminthora divaricata, J. Ag. Key West ; not common. 

 There can be no doubt of this being precisely the same species as the 

 European. Harvey appeared to have some uncertainty with regard to 

 it. 



68. Liagora valida, Harv. Florida ; Prof. Gibbes. 



69. LiAGOEA Catohuesonica, n. sp. Frons tenuis, vermiformis, 

 paullulo calcarea, dichotoma, axillis rotundatis, apicibus subfuscis, 

 filamentis periphericis obtusis, claviformibus, trifurcatis. 



The frond is very slightly covered with calcareous deposit, about 

 2^ inches long ; terete when fresh, compressed when dry, slender, 

 dichotomous. It approaches Z. valida, Harv., but is less robust, and 

 less regularly dichotomous. Key West, South Florida. Only two speci- 

 mens found, one of which was submitted to Prof. J. G. Agardh. 



