THE MARINE kLQM OF SOUTH CABOLINA AND FLORIDA. 261 



West ; growing between tidemarks. Exceedingly variable in size, 

 but not to be confounded with any other species. 



36. Basya (Rhodonema) elegans, Ag. At Charleston, South Caro- 

 lina. This Alga is very conspicuous and beautiful, growing in the 

 mud by the battery, and on Sullivan's Island breakwater, often two 

 feet or more in length, of the most beautiful crimson. 



I collected over a hundred specimens of this plant at Charleston and 

 Key West, and, after careful examination, have come to the conclusion 

 that the plant from the latter locality is an extreme form, and entitled 

 to rank as a variety, as follows : — 



Yar. scotiochroa. Grrowth altogether more slender and delicate, 

 ramelli less bushy in their habit, colour dusky brown, varying to 

 madder-brown, never crimson ; stichidia not so robust, and more shortly 

 stalked than in the typical form. Abundant at Key West. 



37. I) asy a {Rhodonema) ramosissimaj Harv. E,are at Key West. 



38. Basya {Rhodonema) Harveyi, Ashmead. I was fortunate in 

 securing fine specimens of this rare Dasya, some abundantly in fruit. 

 Key West ; latter part of March. 



39. Dasya {Rhodonema) mollis, Harv. Rare at Key West. 



40. Basya {Rhodonema) mucronata, Harv. Very abundant at Key 

 West. Perhaps the commonest seaweed there next to the Sargassa. 



There are two well-marked varieties, one (typical) rigid rough, of 

 bushy growth, the other (var. Floridana^ Harvey ?) with the branches 

 much more slender and tapering. 



41. Basya {Rhodonema) Wurdemannn, Bailej. Eare at Key West. 

 Two or three specimens. 



42. Basya {ZophothaUa) Tumanowiczti, Gatty. At Key West, but 

 rare. 



Zaurenciaece. 



43. Laurencia ohtusa, Lmx. Key West. 



44. Laurencia implicata^ Ag. Common and very variable at Key 

 West. 



45. Laurencia cervicornis, Harv. Common at Key West. 



46. Laurencia gemmifera, Harv. Key West. Not common. 



47. Laurencia papulosa, (aXQY. Key West. Common. 



48. Champia parvula, Harv. Key West. 



49. Champia salicornoides, Harv, Key West. I am surprised to find 

 that this plant is now considered by some a variety of C. parvula. 

 The extremes at all events are distinct enough, ^^ Z. I noticed no inter- 

 mediate links that might join them. 



Corallinacece. 

 60. Jania rubens, Lmx. 



51. Jania Cuhensis, Mont. 



Both species at Key West, densely encrusting other Algae. 



52. Amphiroa fragilissima, Ag. Not abundant at Key West. 



53. Amphiroa dehilis, Kiitz. One or two fragments at Key 

 West. 



Spharococcoide(E. 



54. Belesseria hypoglossum, Lmx. Charleston, South Carolina. 

 Common at the harbour bar, the northern limit in the U.S.A. I heard 

 of its being common at St. Augustine, Florida. 



