458 
Notes on New England Marine Algae—VII. 
By Frank S. CoLvIins, 
(PLATE ——.) 
LyNnGByA GRACILIS (Meneg.) Rab.; Gomont, Monographie des 
Oscillarieés, 144. pl. 2, fig. 20. 
A small species, 5-8 in diameter, with slender sheath and 
cells usually shorter than broad; remarkable for the color, which is 
a purplish red, the living plant under the microscope reminding 
one of a very minute Bangia. 1 found it in July, 1896, at Cape 
Rosier, Maine, among other alge on a mooring buoy that: had 
been hauled up on the beach. 
SPIRULINA VERSICOLOR Cohn; Gomont, Monographie des Oscil- 
larieés, 273. 
The trichomes are much like the common S. sudsalsa Oersted, 
but the spiral is denser and more regular. The color is very dis- 
tinct, a dark purple in the stratum, and a rosy purple in the tr- 
chome. In the dried specimen this color disappears almost 
entirely, giving place to the usual light green of the genus. 
Found at Cape Rosier, on the mooring buoy, with the Lyngbya 
mentioned above. 
These two species just mentioned are, as far as I know, the 
only marine Nostochineae of a red color found in America; and 
it is somewhat interesting that both should have been found at the 
same time and place. The object on which they grew gives 
somewhat unusual conditions for the growth of algae; practically 
uniform depth combined with considerable movement of “the 
water. It would hardly be safe to draw the conclusion that thes¢ 
conditions tended to produce the exceptional color, but it is of 
interest to note that the localities given by Gomont for both spe 
cies are in the Mediterranean, Adriatic and Baltic, in all of which | 
the tidal movement is quite small. 
ENTEROMORPHA MINIMA Naeg. in Kuetz. Sp. Alg. 482. : 
A small species, somewhat resembling E. micrococca Kuete-» — 
but with larger cells, 5-7 # diam. In &. micrococca the cell-wall is _ 
much thickened, especially on the inside, while in the present 
