20 University of California Publications in Botany [^^"l. 8 



which forms gonidangia near the surface of the host, that, nothwith- 

 standing the absence of gonidangia, there can be but little doubt 

 that it belongs to the genus Eydla. On the other hand, the genus 

 Chlarogloea never has gonidangia, and the species littea is so assigned 

 because of the absence of gonidangia and because of its resemblance 

 to C. tiihercidosa -Wille in the size, color, shape, and earl^^ arrange- 

 ment of the cells in a colony. But that species is wholly epiphytic, 

 and does not have radiating, branching filaments. Furthermore, Wille 

 states that cell division is in one plane, "nach einer Richtung des 

 Raumes" (1900, p. 4, pi. 1, figs. -^6). This method in the increase 

 of the number of cells of the plant, or colony as it may be called, 

 certainly is different from that of Chlorogloea lutea, which has cell 

 division in at least three planes. 



Howe (1914, p. 13) has described a plant which is very similar to 

 Chlorogloea lutea. He placed it in the genus Chlorogloea, and since 

 it was wholly within the frond of the host, he called it C. endophytica, 

 stating that it was very close to Chlorogloea tuberculosa (Hansg.) 

 Wille, but differs "in its endophytic habit, and in its less distinctly 

 seriate arrangement of the cells, the softer gelatinous walls soon allow- 

 ing the cells to become inordinate." He stated further that ''cell 

 divisions apparently occur in various planes." Chlorogloea lutea 

 differs from Chlorogloea endophytica in being only partially endo- 

 phytic, in having smaller cells, in building up larger colonies, and 

 distinctly having cell divisions in all directions. 



FAMILY 2. CHAMAESIPHONACEAE borzi 



Thallus unicellular, distinct or associated into non-filamentous 

 families, or pluricellular individuals which are either filamentous or 

 which are differentiated into a more or less chroococcoid basal pros- 

 trate portion and an upright filamentous portion; multiplication by 

 transformation of the whole or of a part of the protoplast of a cell, 

 gonidangium, into gonidia either by simultaneous or by successive 

 divisions in some species, or by both vegetative cell divisions and 

 formation of gonidia. 



Borzi, Note alia morfol. e. biolog. delle Alghe ficocr., vol. 14, 1882. 

 p. 312 ; West, Algae, vol. 1, 1916, p. 41. 



Borzi founded the family of the Chamaesiphonaceae with the 

 special view of including tlie fresh water species referred by him to 

 Chamaesiphon, Clastielium and Cyanocystis. He mentions Dermo- 



