IV. ECTOCARPACE^.— EcTocAEPus. 143 



Tufts 2 — 3 inches long, loose, plumy, the ultimate divisions suLcorymbose or 

 fastigiate. Filaments very slender and much divided, the divisions alternate and 

 patent. Propagula abundant on the lesser branches, several together in secund 

 order near the base of the branch, at first ellipsoidal, then linear-oblong, then elon- 

 gating and linear, always very obtuse and quite sessile, scarcely narrower at the 

 base than above it, sometimes slightly obovoid. Colour a j^ellowish green. To the 

 naked eye this pretty species looks like E. sillculosus or E. viridis, but the difference 

 in fructification at once separates it from those species. It comes nearer in charac- 

 ter to E. Durkeei, but is a much more delicate plant, with longer articulations, more 

 patent branching and differently shaped fruit. 



Plate XII. G. Fig. 1 , Portion of a filament of Ectocarpus Mitchellce, magnified ; 

 fig. 2, minute portion, with projiagula ; fig. 3, a propagulum ; the latter figures 

 highly magnified. 



**** Propagula unknoivn (probably of the same form as in last section.) 



11. Ectocarpus Lafidsburgii, Harv. ; filaments dark brown, tenacious, intricate, 

 much branched ; branches irregularly forked, divaricated, zig-zag, bristling with 

 numerous, short, spine-like, horizontal ramuli ; articulations short, the endochrome 

 fiUing the cell, and recovering shape on being moistened, after having been dried. 

 Harv. Phyc. Brit. t. 233. (Tab. XII. D.) 



Hab. Dredged in deep water. Halifax bay, W. H. H. (v. v.) 



Filaments 1 — 2 inches long, capillary, forming small, intricate tufts, tangled round 

 the branches and roots of various Algae, and on other submerged substances. 

 Branches very widely spreading, often at right angles, variously curved, bent, and 

 divided, almost every articulation emitting a minute spine-like, horizontally patent 

 ramulus. Colour dark brown. Substance firm, and rather rigid. Propagula un- 

 known. 



Plate XII. D. Fig. 1 , Portion of a filament of Ectocarpus Landsburgii, magni- 

 fied; fig. 2, minute portion, highly magnified. 



1 2. Ectocarpus Hooperi ; tufts rope-like ; filaments entangled, flexuous, sparingly 

 and irregularly branched ; branches distant, elongate, subsimple, set at subdistant 

 intervals, with short, horizontal, spine-like ramuli ; articulations of the branches 

 twice or thrice as long as broad. (Tab. XII. E.) 



In Mr. Hooper's Herbarium, without habitat (probably Greenport ?). (v. s.) 



