296 Minnesota Algae 



Canada. In tufts onChondrus crispus. Malpeque, Prince Edward 

 Island. (FauII). West Indies. Among other algae on Lauren cia o b- 

 t u s a. Near Kingston. (Duerden.). 



Genus ASTEROCYTIS Gobi. Kurzer Bericht Algol. Excur. 

 St. Petersb. Gesellsch. Nat. 10: 93. 1879. 



Colonies erect, filamentous, branched; cells ellipsoid, irregularly ar- 

 ranged, reproduction by means of non-motile, naked gonidia; sexual re- 

 production unknown. 



. 541. Asterocytis ramosa (Thwaites) Gobi. Kurzer Bericht iiber die im 



Summer 1878 ausgefuhrte Algologische Excursion. St. Petersb. 



Gesellsch. d. Naturf. 10: 93. 1879. De Toni. Syll. Algar. S; 690. 1907. 



Collins. Notes on New England Marine Algae. V. Biill. Terr. Bot. Club. 



18: 336. 1891. (G o n i o 1 1 i c hu m ramosum (Thwaites) Hauck). 



Plate XX. fig. 21. 



. It; 



Filaments 12-20 mic. in diameter, i-io mm. long, associated in green or 

 lead-colored fascicles; branching somewhat dichotomous or unilateral; 

 cells 5-8 mic. in diameter, 8-20 mic. in length, in a single series, cylindrical- 

 rotund or elongate; cell contents lead-colored or green. 



Massachusetts. In small quantity among other algae. Quincy. (Collins). 



Genus GLAUCOCYSTIS Itzigsohn in Rabenhorst. 

 De Algen Europas. no. 1935. 1866. 



Cells elliptical, oval, rarely elongate-elliptical, associated in spherical 

 or elliptical, microscopical families of from two to eight cells, surrounded 

 by a colorless, thin and soon diffluent common tegument; cell contents at 

 first blue in color, finally displaying a blue-green or green chromatophore; 

 reproduction by division of cells in one direction. 



542. Glaucocystis nostochinearum Itzigsohn in Rabenhorst. De Algen Eu- 

 ropas. no. 1935. 1866. De Toni. Syll. Algar. 5: 693. 1907. 

 Lagerheim. Ueber einige Algen aus Cuba, Jamaica and Puerto-Rico. 

 Bot. Notiser. 199. 1887. 



Plate XX. fig. 22. 



Cells 10-18 mic. in diameter, 18-28 mic. in length, solitary or in fami- 

 lies of from two to eight cells; families elliptical or somewhat spherical; 

 cell contents light blue-green or green; cell walls thin. 



West Indies. Fajardo, Porto Rico. (Sintenis, Moebius). 



Genus PORPHYRIDIUM Naegeli. Gatt. Einzell. Alg. 139. 1849. 



Plant mass irregularly expanded, thin, gelatinous, crustaceous; cells 

 numerous, spherical or more or less angular by compression; cell contents . 

 reddish purple, with a central pyrenoid and an eccentric nucleus; individual 



