140 ECTOCARPACEJj:.— EcTocARPus. iv. 



axils. The propagula are generally formed of the upper half of the ramuli, leaving 

 an unchanged portion or pedicel at the base of the propagulum : they taper to a 

 fine point, and are sometimes prolonged into ramuli, or tipped with an unchanged 

 mucro. Colour mostly yellowish olive, but variable. 



4. EcTOCAEPUS viridis ; tufts feathery, loose, expanding, olive-green ; filaments 

 slender, much branched, very flexuous, dichotomous, the lower forkings distant, the 

 upper approximated, having a few lateral ramuli ; axils rounded ; apices alternate, 

 articulations of the branches once and half as long as broad ; propagula sessile or 

 pedicellate, elongate, tipped with a long mucro or unchanged portion of ramulus. 

 (Tab. XII. B. C, two varieties.) 



Hab. On AlgEe between tide-marks. Charleston, Prof. L. W. Gihhes. Provi- 

 dence, R. I., Mr. Olney. Bergen Island, Mr. Walters and Mr. Hooper. Hellgate, 

 Mr. C. Congdon. (v. s.) 



I fear this is too nearly related to the preceding, notwithstanding the apparently 

 dififerent mode of branching. Dried specimens have the ramuli at the tips of the 

 divisions of the tufts dense, or slightly fastigiate or corymbose, and are of a very 

 green olive. The propagula are more frequently formed in the basal half of the 

 ramulus, and are therefore sessile ; but sometimes are found in the middle portion 

 also. The very patent, rounded axils I once thought a good mark, but fear that it 

 is hardly constant enough. 



Plate XII. B. Fig. 1 , Part of a filament of Ectocarpus viridis, magnified ; 

 fig. 2, minute portion, with propagula., highly magnified. 



Plate XII. C. Fig. 1, Portion of a filament of Ectocarpus viridis, var., 

 magnified ; fig. 2, minute portion, with propagula, highly magnified. 



5. Etocarpus lutosus ; tufts somewhat entangled and rope-like ; filaments 

 intricately branched, decompound, the branches spreading, opposite or alternate, 

 with few, distant, scattered ramuli ; angles very wide ; articulations of the branches 

 once and half as long as broad ; propagula very long, linear, formed in the middle 

 of short, spreading or reflexed ramuli whose base forms a pedicel, and whose apex 

 a long excurrent mucro. (Tab. XII. A.) 



Hab. Greenport, Long Island, Mr. J. Hooper, (v. s.) 



This has the habit of E. tom.entosus, but branching more like E. littoralis. I have 

 seen but a solitary specimen, and though I give it a name, not knowing how to 



