LIST OF THE SEA- WEEDS OR MARINE ALG.E, ETC. 289 



48. Delesseria sinuosa, Lam. Gay Head and No Mans Land; abundant 



in company with Ptilota elegans. Watch Hill, (Professor Eaton.) 

 Newport. Although identified by Harvey with the European 

 plant, it seems to differ in several. respects from the descrip- 

 tions of that plant. The conceptacles are described as being 

 on the midrib, or lateral nerves, in the European plant. In 

 ours, although sometimes found in a similar position, they are 

 more frequently scattered, and the tetraspores are frequently 

 dispersed instead of being confined to the marginal leaflets. 

 It generally fruits in winter and early spring, but I have one 

 specimen fruiting in September. I have no specimen of D. 

 quercifolia of the southern hemisphere with which to compare 

 mine. 



49. Gracilaria multipartita, J. Ag. Wood's Hole, Hadley Harbor. 



On small stones and gravel, just below low-water mark. Our 

 broadest specimens are considerably narrower than the Euro- 

 pean ; some are so narrow as to resemble Solieria chordalis, and 

 are var. B. Hart. In September, 1870, 1 found large masses 

 of a Gracilaria, which I picked up by the armful at East Ma- 

 rion, Long Island. I think likely it was G. confervoides, Grev., 

 but have misplaced my specimens. 



Gelidiace^e. 



50. Gelidium corneum, Lamour. This alga, so common throughout 



Europe, is only occasionally seen on our coasts, and then only in 

 a very insignificant form. My specimens are not more than two 

 inches high, and seem to belong to the variety cririalis, Ag-. 



51. Solieria chordalis, J. AG. Very common and characteristic. 



Wood's Hole, Greenport, Orient, in company with Polysiplionia 

 variegata and Gracilaria multipartita, the narrow forms of which 

 it much resembles. Is not Rhaudonia tenera, J. AG., the same 

 as this plant ? There is in the herbarium at Cambridge, a 

 specimen from Lenormand, marked R. tenera, J. AG., New York 

 Harbor. It is without fruit, and the structure of the stem is that 

 common to both Solieria and Rliabdonia. As I have never seen 

 American specimens of R. tenera in fruit, while Solieria is very 

 common, I think it is probable that what has been described as 

 Rhabdonia is merely a sterile plant of Solieria. 



Hypnea musciformis, Lam. Fine specimens and not uncommon at 

 Nobska and the adjoining Falmouth shore. A common plant 

 of the Mediterranean and the West Indias. There are, how- 

 ever, in the herbarium at Cambridge, no specimens from either 

 of those localities as luxuriant as those from Nobska, some of 

 which are a foot long. 

 S. Mis. 61 19 



