IV. 
ECTOCARPACEiE. — Ectocarpus. 
139 
H ats . Parasitical on the smaller Algae. Prince Edward’s Island, Dr. Jeans. 
South Boston, Dr. DurJcee. Lynn, Mrs. Estes, (v. v.). 
Tufts feathery, 2 — 4 inches high, the main stems slightly entangled at the base, 
the lesser branches quite free, spreading. Filaments much branched, all the 
branches and their divisions either opposite or in fours, widely spreading, almost 
horizontal, the larger divisions subdistant, the lesser gradually nearer. Famuli 
filiform, patent, mostly opposite. Propagula (or perhaps spores ?) immersed in the 
lesser branches, often bipartite. Colour a pale olive green. 
2. Ectocarpus littoralis, Lyngb. ; tufts dense, interwoven, olive-brown, or olive- 
green ; filaments capillary, much and irregularly branched, the ultimate divisions 
erecto-patent, alternate or opposite ; angles acute ; propagula forming elongated, 
linear swellings in the substance of the greater and lesser branches. Harv. Phyc. 
Brit. t. 197- J- Ag. Sp. Alg. 1, p. 18 (?) and E.firmus,p. 23. 
Hab. Very abundant on littoral Fuel; also attached to various substances 
between tide-marks. Shores of the Northern and Midland States, (v. v.) 
Tufts 6 — 12 inches long, dense and bushy, sometimes bundled together in ropes, 
sometimes untangled and feathery. Branches mostly alternate, repeatedly divided, 
the divisions issuing at acute angles, the upper ones opposite. Articulations of the 
branches almost as long as broad. Prop>agida elongated, many times longer than 
their breadth, at first transversely striate, (like an Oscillatoria), afterwards monili- 
fonn. Substance soft, but not glutinous, closely adhering to paper. The colour 
varies from olive-green to brown ; and if dried by artificial heat, the tints may be 
much vivified and made more green. 
This is the commonest form on the American coasts. 
* * Propagula linear or lanceolate, formed of or in the ultimate ramuli. 
3. Ectocarpus siliculosus , Lyngb. ; tufts yellowish or pale olive-green, gelatinous, 
soft ; filaments very slender, excessively branched ; ultimate branchlets alternate 
or secund, attenuated ; propagula pedicellate, subulato-lanceolate, attenuated to a 
fine point. Harv. Phyc. Brit. t. 162. J. Ag. Sp. Alg. vol. 1, p. 22. 
Hab. On various substances between tide-marks. Shores of Long Island Sound, 
and Hudson River at West Point, Prof. Bailey . Prince Edward’s Island, Dr. Jeans. 
Charleston, S. C., W. H. H. (v. v.) 
Tufts 3 — 6 inches long or more, not entangled. Filaments excessively branched, 
and very slender, all the divisions usually alternate and erecto-patent, with acute 
t 2 
