1906] Collins, — Notes on Algae, — VII 125 



B. plumosa the ramuli are bifarious and plumose, the distinction 

 between branches of successive orders being quite marked. We 

 certainly have both types; more investigation will be needed to make 

 sure where specific lines should be drawn. Indeed, all the species of 

 Bryopsis are vague in their limitations. 



Streblonema parasiticum (Sauv.) De Toni, Syll. Alg., Vol. Ill, 

 p. 575; Ectocarpus parasiticus Sauvageau, Journal de Botanique, 

 Vol. VI, p. 82, PI. III. A very small plant with irregular basal fila- 

 ments penetrating the tissue of the host and sending out short, simple 

 filaments with cells 6-8 /i diameter and about one and a half diameters 

 long; also slender hairs and subcylindrical, mostly biseriate, pluri- 

 locular sporangia. In Europe this species occurs in Cystoclonium 

 purpurascens (Huds.) Kiitz., Gracilaria compressa (Ag.) Grev., and 

 Ceramium rubrum (Huds.) Ag. It has been found here only in 

 Cystoclonium purpurascens, in the main stems and larger branches 

 of well grown plants; where the endophyte is abundant the natural 

 red color is changed to a dull yellow. It has been collected at Harps- 

 well, Maine, and at Wood's Hole, Mass.; probably it occurs wherever 

 the host plant is found. 



Streblonema oligosporum Stromfelt, Om Algvegetationen i 

 Finlands sydvestra Skjirgard, p. 133, PI. I, fig. 5. Another minute 

 endophytic plant, with a basal layer of somewhat contorted, freely 

 branching filaments, composed of rather irregular cells usually 10 /i 

 long, 5-10 fi diameter; from these arise simple, cylindrical branches, 

 about 5 [L diameter, ending in colorless, articulate hairs, which pro- 

 ject beyond the surface of the host; also uniseriate plurilocular spo- 

 rangia, usually cylindrical, 25-40 by 8-15 p., occasionally shorter and 

 ovate-lanceolate in outline. This species was first found in Iceland, 

 where it occurred in the tissue of Coilonema Chordaria Aresch.; a 

 plant found at Bailey's island, Casco Bay, Maine, appears to be 

 identical, although occurring in a different host, in this case, Gloio- 

 siphonia capillaris (Huds.) Carm. While resembling the preceding 

 species, it seems to be distinct; in S. parasiticum the basal filament 

 bears, in addition to the hairs, short vegetative filaments and spo- 

 rangia of about the same height; in S. oligosporum the hairs are borne 

 at the ends of the branches, which are fewer in number and much 

 longer than the sporangia. 



Asperococcus echinatus (Mert.) Grev. var. vermicularis 

 (Griff.) Harvey, Manual of the British Algae, p. 35. In place of the 

 rather coarse, pipe-stem-like fronds of the type, the fronds in this 



