IV. 
ECTOCARPACEfiE. — Ectocakpus. 
143 
Tufts 2 — 3 inches long, loose, plumy, the ultimate divisions subcorymbose 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 obovoicl. Colour a yellowish green. To the 
naked eye this pretty species looks like E. siliculosus 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 Ectocakpus Mitchellce , magnified ; 
fig. 2, minute portion, with propagula ; fig. 3, a propagulum ; the latter figures 
highly magnified. 
* * * * Propagula unknown (probably of the same form as in last section.) 
11. Ectocarpus Landsburgii , ITarv. ; 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 
filling 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.) 
