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Genus, ECTOCARPUS. Lyng. 
Filaments capillary, jointed, olivaceous or brown, flaccid, without longitudinal 
striae ; fruit spherical or elliptical; external or imbedded spores ; or lanceolate, linear, 
or conical silicules. 
No. 40. E. crinatus . Carm. Filaments decumbent, sparingly branched 
branches, sub-simple, distant, elongated ; spores globose, scattered, sessile.— Hook . 
On muddy shores in summer, very abundant for about two weeks only. The best specimens I found 
on Communipaw Flats, and at Kavon Point; it is very delicate, and must be carried in water; the spores 
are large, but very sparing ; it forms patches of 2 to 12 inches. 
No. 41. E. litoralis. L. Tufts dense, dirty brown, much and irregularly 
branched, frequently opposite ; fructification, oblong swellings or stichidia, or sub- 
globose connections imbedded in the substance of the branches. 
Very common in large tangled masses, 2 to 12 or 15 inches, growing in all parts of the harbor, on other 
Algse, at all seasons ; also on slime-covered rocks in autumn : tufts much entangled. 
No. 41. E. litoralis . Tar. A. Summer and autumn on Fucus in strong tidal 
currents ; a beautiful green. 
No. 42. E. fenestratus. Berk. Pale green, very slender, filaments not much 
branched, branches distant, alternate; densely striate. 
Summer, on dock logs, very flaccid, 1 or 2 inches long; silicules very abundant. 
No. 43. E. tomentosus. Iluds. Filaments flexuous, very slender, interwoven 
into a dense spongy mass ; silicules stalked, linear-oblong, obtuse.— Hook. 
In summer on docks and stakes, 1 to 8 inches, imperfectly adhering to paper. 
No. 44. E. distortus . Carm. Yery much branched, greenish brown, angularly 
bent; branches spreading very wide ; ramuli divaricate, obtuse, spine like ; fruit 
large, round, sessile. 
Summer and autumn, parasitical on Fucus and other Algae, near low water mark; a delicate plant, 
flaccid, and adheres well to paper. 
Note—I have not been able to devote the time which the genus Ectocarpus require ; the varieties are very numerous in our waters, and 
many more would no doubt show a distinctive specific character. 
Family VII. RHODOMELAOBiB. Har. 
Red, or brown red, or dull brown; leafy or filiform ; areolated or articulated; 
polygonal cells ; fruit double, or of two kinds ; conceptacles external, ovate or urn- 
shape, furnished with a terminal pore or opening, and containing a tuft of pear-shape 
spores ; also tetraspores immersed. 
Note—T he double fruit is on the authority of European writers; experience may show that the whole is only one conception or form of 
fruit, in which the differently shaped organs perform the offices of antheridia or antennae, tentaculse, seed, and womb or pericarp. 
Genus, RYTIPHLtEA. Ag. 
Filiform or compressed, pinnate, reticulated; siphons surrounding a central 
cell; fructification ; ceremedia, and tetraspores. 
