THE GREEN ALGAE OF MOUTH AMERICA 3 



American algae. The plates, illustrating all but one of the 

 new genera, are the work of Professor F. D. Lambert, with the 

 exception of the plate of Oedocladium, which is by Professor 

 I. F. Lewis. 



Page 94, for Key to the Species of Ophiocytium, substitute, 

 i. Attached. 2. 



i. Free. 3. 



2. Cells 5-7 /u diaui., stipe 10-14 /j. long. 6. O. gracilipes. 



2. Cells 3-5 M diam., stipe 2-3.5 /* long. 5. O. arbuscula, 



3. Bearing a stipe or spine. 4. 



3. Without stipe or spine. 7. 



4. Stipe with capitate end. i. O. ntajits. 



4. Stipe or spine acute. 5. 



5. Spine at one end. 2. O. cochleare. 



5. Spine at each end. 6. 



6. Cells 12-15 f- diam. 7. O. bicuspidatum. 



6. Cells 10 M diam. or less. 3. O. capital iim. 



7. Cell rounded at both ends. 4. O. parvulum. 



7. Cell rounded at one end, sharply truncate at the other. 



8 O.truncatum. 



After the description of O. CAPITATUM, add, 



Var. LONGISPINUM (Mob.) Lemmermann, 1899, p. 32, PI. IV, 

 figs. 21-25; Rcinschiella longispina Mobitis, 1894, p. 331, PI. I, 

 figs- 3 l ~33- Cells 6-7 ju. diam., 3-4 diam. long, at first straight, 

 then curved, finally convolute, spine 16-50 //. long at each end. 

 Wis., G. M. Smith. Europe. 



Page 95, after description of O. GRACILIPES, add, 



7. O. BICUSPIDATUM (Borge) Lemmermann, 1899, p. 31, PI. 

 Ill, figs. 13-15; O. majusv&r. bicuspidatum Borge, 1894, p. 10, 

 PI. I, fig. 3. Cells solitary, 12-15 /" diam., arched or spiral, 

 with spine 5-7 //. long at each end. Fla., Borge. Europe. 



8. O. TRUNCATUM Lemmermann, 1899, p. 33, PI. IV, figs. 

 26-29. Cells solitary, 5-6 /u, diam., straight, arched or spiral, 

 one end rounded, the other sharply truncate. Harpswell, 

 Maine, Lambert. Europe. 



Page 95, TRIBONEMA Derbes & Solier is now generally 

 accepted in place of CONFERVA Linnaeus. 



Page 99, under CHLOROTHECIACEAE, cancel "Only one 

 genus represented here," also everything referring to CHARAC- 

 IOPSIS, and substitute as follows : 



