THE GREEN ALGAE OP NORTH AMERICA 457 



27. Apiocystis Bramiiana, after Nageli. 250 X i. 



28. Palmodactylon varium, young colony, after West. 125 X i. 



29. Prasinocladus subsalsus, after Davis. 600 X r. 



30. Collinsiella tuberculata, after Setchell. 200 X i. 



31. Chlorococcum humicola, after Nageli. 300 X i. 

 323. Trochiscia reticularis, after West. 400 X i. 

 32b. Trochiscia hirta, after West. 300 X i. 



33. Chlorochytrium Leranae, cells in different stages, in tissue 



of L,emna, after Klebs. 200 X i. 



34. Rhodochytrium Spilanthidis, irregularly shaped cell, after 



Lagerheim. 200 X i. 



35. Chlorocystis Cohnii, on Enteromorpha, after Moore. 



1000 X i. 



PLATE V. 



36. Characium gracilipes, after Lambert. 500 X i. 



37. Codiolum gregarium, after A. Braun. 100 X i. 



38a. Protosiphon botryoides, vegetative, after Klebs. 50 X i. 

 38b. Protosiphon botryoides, with aplanospores, after Klebs. 

 100 X i. 



39. Eremosphaera viridis, section of cell, after Moore. 2ooX i . 



40. Excentrosphaera viridis, section of cell, after Moore. 



1000 X i. 



41. Zoochlorella conductrix, in Hydra viridis, after Beyerinck. 



600 X i. 



42. Rhaphidium falcatum var. fusiforme, group of individuals, 



after Nageli. 300 X i. 



43. Palmellococcus miniatus, with aplanospores, after Choclat. 



800 X i. 



44. Oocystis solitaria, after West. 800 X i. 



45. Chodatella citriformis, after Snow. 1000 X i. 



46. Nephrocytium Agardhianum, mother and daughter cells, 



after Nageli. 1000 X i. 



47. Tetraedron trigonum, front and side views, after Nageli. 



800 X i. 



48. Cerasterias raphidioides, after Reinsch. 1000 X i. 



PLATE VI. 



49. Thamniastrum cruciatum, after Reinsch. 500X1. 



