8 



or more irregularly shaped discs up to 300 /j. in diameter or even 

 more. The young specimens have a nearly circular or somewhat 

 undulate continuous margin (Fig. 3, a and b), in older specimens 

 it is more irregular and the extremeties of the filaments become 



Fig. 3. Erythrocladia subintegra Rosenv. 



a, b, young plants seen from above, c, older plants with more irregular 

 margin, d, transverse section of the thallus. (About 700 : 1). 



more or less free (Fig. 3 c). It has marginal growth and, as 

 pointed out by ROSENVINGE, the cells are dichotomously divided 

 but the bifurcation is most often not quite equal, the one cell 

 being larger than the other. Near the margin the cells are often 



linear-oblong or forked, in the middle 



shorter, oblong, or of more irregular 



shape. 



The diameter of the cells is mostly 



3 4 n but it is very variable and so 



also the length which often reaches 



up to 16 u or more. 



The chromatophore was not 



clearly visible but it seems to be 



Fig. 4. Erythrocladia subintegra parietal with a pyrenoid in the middle 



Rosenv. Part of a plant seen of the cell. 



from above. In some of the rr-,1 /T -.- \ 



cells sporangia are cut off. The sporangia (Fig. 4) are as 



(About 700 : 1). said by ROSENVINGE cut off in the 



ends of the vegetative cells through 



a somewhat curved wall ; they are of variable shape and size, 

 mostly roundish orbicular and about 3 4// broad. 



In referring this plant to the genus Erythrocladia I confess 

 that it is not without doubt. According to ROSENVINGE 1. c. p. 72 



