148 



INTRODUCTION TO CRYPTOGAMIC BOTANY. 



S. calophyllu'in, if not all, belong more properly to the same 

 group. If the genus Ulothrix belongs to this division, of which 

 I have no doubt, the endochromes are sometimes resolved into 

 a multitude of zoospores, and I believe this to hold good with 

 Lynghya speciosa, and L. Cai^michaeliana. In the genus 

 Sewosiphon, bodies are produced resembling Gloeocapsa, which 

 are clearly reproductive. It is probable too, that in some cases 

 the connecting cells, which are filled with pure green endo- 

 chrome, like those of Sphoerozyga, are reproductive.* 



120. It may, however, perhaps be doubted whether any of the 

 species of SeirosipJion, beautiful as they are, are autonomous. 

 At any rate, their mode of growth and ramification are totally 



Fig. 37. 



Threads of Rivularia nitida, magnified with their connecting cells, 

 from specimens gathered at Torquay. 



different from those of other Oscillator io3. It is a single 

 endochrome, in fact, which bursts through the investing tube, 



* Unger says, that Nostoc Sphcericiim is multiplied by the connecting 

 cells. Act. Nov., vo). 16, P. ii. p. 546, tab. xxxix. 



