1^19] Setchell-Gardncr : Myxophyceae 83 



3. Symploca aeruginosa S. and G. 



Filaments 4-4. 5/^ diam., forming an aeriiginous stratum of erect, 

 loose fascicles, 1 mm. high ; trichomes decidedly torulose, 3-3. 5/i, diam. ; 

 cells quadrate, terminal cell much rounded, neither capitate nor 

 cah'ptrate ; protoplast homogeneous, pale aeruginous, dissepiments 

 obscure; sheath very thin, colorless, close, at first smooth, later becom- 

 ing roughened on the outside. 



Growing on mud covered rocks, near the upper-tide limit. St. 

 Michael, Alaska. 



Setchell and Gardner, m Gardner, New Pac. Coast Alg. Ill, 1918a, 

 p. 469. Symploca laeteviridis Setchell and Gardner, Alg. N.W. Amer., 

 1903, p. 188 (not of Gomont). 



In the Algae of Northwestern America the plant described above 

 was referred to Symploca laeteviridis Gomont with the statement that 

 ' ' it certainly seems strange to find a plant, hitherto known only from 

 the tropical locality of Key West, so far north." Since then we have 

 been able, through the kindness of Professor W. G. Farlow, to examine 

 an authentic specimen of Gomont 's species. It is heavily incrusted 

 with lime and has a decidedly conical apical cell, while the cells of the 

 trichome are almost always decidedly longer than broad. The 

 diameter of the cells is 1.5-2/x and the dissepiments are comparatively 

 broad and transparent. In all of these respects it differs from our 

 Alaskan plant, although that comes within the limits of thickness 

 assigned by Gomont to his species. The Alaskan plant is more slender 

 than Symploca atlantica Gomont, with less distinct sheath, and more 

 rounded terminal cell, which is not at all thickened above. It differs 

 also in having inconspicuous dissepiments. On account of these vari- 

 ous differences it seemed necessary to separate the Alaskan plant 

 and consider it an independent species. 



SUBFAMILY 4. SCHIZOTRICHEAE forti 



Trichomes in well developed filaments, two to many within a com- 

 mon sheath ; sheaths in many species colored (yellowish brown, red 

 or blue). 



Forti, in De-Toni, Syll. Alg., vol. 5, 1907, p. 315. Vaginarieae 

 Gomont, Essai Class, Nost. Hom., 1890, p. 351. 



We have preferred to follow Forti in choosing the designation of 

 this subfamily, since the genus Vaginaria has, justly and b}^ common 

 consent, been relegated to synonymy (cf., however, Otto Kuntze, 



