144 ECTOCAKPACE^.— EcTOCARPus. iv. 



This forms dark brown, rope-like tufts, not unlike some states of E. tomentosus, 

 but the filaments are much more robust than in that species. The numerous spine- 

 like ramuli resemble those of E. Landsburgii, but are less abundant ; and the 

 articulations are much longer than those of that species. It appears to me to be 

 sufficiently characterized, and I hope its discoverer may be able to ascertain the 

 place where his specimen was obtained, and may find it again. At present I have 

 seen but one specimen ; Mr. Hooper informs me that he has no duplicate. 



Plate XII. E., Fig. 1. Portion of a filament of Ectocarpus Hooperi, magnified ; 

 fig. 2, minute portion, more highly magnified. 



13. EcTOCAEPXJS Dietzim ; tufts entangled, floccose ; filaments robust, very flaccid, 

 elongate, slightly and distantly branched, subdichotomous (?), flexuous, here and 

 there emitting dichotomous branches ; ramuli few, subulate ; articulations of the 

 branches once and half as long as broad. 



Greenport, Herb. J. Hooper, (v. s.) 



Forming a pale green, entangled, very flaccid tuft, 4 — 5 inches long, with the 

 habit of E. pusillus or of E. crinitus. It seems different from any species of North 

 America with which I am acquainted, but is not sufficiently defined by the above 

 diagnosis. I have seen but one specimen, which adheres so closely to the paper, that 

 it is difficult to remove fragments for examination, and I have found it impossible 

 to display the portion examined, so as to enable me clearly to trace the order of 

 branching. This imperfect examination, and the absence of fructification, compel me 

 to place the species, at present, among the doubtful ones, but I trust more perfect 

 specimens may eventually be obtained. Meantime, the specific name is bestowed in 

 honour of Mrs. Dietz, of New York ; a lady whose diligent researches in marine 

 botany entitle her to this token of respect from fellow-labourers. 



