1906] Collins, Notes on Algae,— VIII 159 



plants probably belonging here have occasionally been found, in only 

 one instance has fruit been observed in American specimens and the 

 determination made definite; in this case the plant grew on a pebble 

 to which was attached a frond of Laminaria longicruris De la Pyl., 

 washed ashore at Revere Beach, ^Nlass., May 8, 1904. 



CoNCHOCELis ROSEA Batters, Phyc. Mem., Vol. I, p. 27, PI. VII. 

 Though less common than the other perforating algae, Gomonfia 

 polyrhiza (Lagerh.) Born. & Flah., and Ma.siir/orolens tesfarum 

 Lagerheim, this species is not infrequently met with in dead shells of 

 mollusks, mostly of the heavier kinds, to which it gives a pleasant 

 pink color. By decalcification there is obtained a dense mat of articu- 

 late branching filaments, 2-7 n diameter, cells varying greatly in length, 

 occasionally expanding to 30 /x diameter, the expansion containing 

 what is supposed to be a spore, 13-15 a diameter. There has been 

 some question as to the position of this genus, and it has been sug- 

 gested that it may be a variety of Ostreobium Quekettii Born. & Flah., 

 but this seems hardly likely, if Batters' description is correct. It has 

 been found at CascoBay, Maine, and at Revere Beach, Mass.; prob- 

 ably it will be found at other stations. 



Rhodomela lycopodioides (L.) Agardh, Species Algarum, p. 

 377. This is a characteristic Arctic species extending some distance 

 into the temperate zone on both sides of the Atlantic and Pacific 

 oceans. It is extremely variable in form, and its distinction from 

 the somewhat more southern and also varial>le R. suhfusca (Woodw.) 

 Ag. is bv no means sharp. The writer found a small scrap of it 

 washed a"shore at Har]^swell, IMaine, in July, 1903; at a visit to the 

 same place in June, 1904, it was quite abundant, but in July, 1904, 

 and July, 1905, was again rare. This would .seem to indicate that 

 its season was earlier than that of R. suhfiisca, which is not uncommon, 

 at least in its later stages, on the Maine coast in July. In typical 

 R. subfusca the main branches are often nearly naked below, bearing 

 spirally arranged branches of the next order, each order of l)ranches 

 being quite regularly arranged on the branch of the preceding order, 

 the penultimate branches being short, of about the same length, and 

 ending in a dense glomerule of ramuli. In typical R. lycopodioides 

 the branching is more irregular and except at the tips more dense, 

 the successive orders of branches less distinct, longer and shorter 

 branches being intermingled; when the branching is dense it is dense 

 throughout, not specially at the tips. Short spindle-shaped branches 



