104 



TRANSLATIONS. 



On the Chronispores, or Chronizoospores of Hydrodic- 

 TYON, and on some Analogous Eeproductive Bodies. 

 By M. N. Pringsheim. 



(From ' Ami. d. Sc. Nat./ IVnie Ser., t. xiv, p. 53. Originally published 

 in German ia Bericht der Ak. d. Wisseuschaft du Berlin, 1860.) 



(Contlmiecl from page 59.) 



It must be remarked tliat there are two sorts of zoospores 

 formed in \he polyhedrons — large and small^ (figs. 18 and 19) 

 — differing in size as much as those zoospores do that are 

 produced in the cells of the retiform Hydrodictyon, some of 

 "which unite into a network^ while the smaller ones always 

 remain separate. On the contrary^ in the polyhedrons all the 

 zoospores are united in a retiform manner ; the meshes of 

 those formed from the smaller ones being more numerous 

 and narroAver. 



The generation of fresh reticulations within the poly- 

 hedrons is a phenomenon Avhicli proves in the most certain 

 manner that the zoospores escaped from Hydrodictyon (fig. 1) 

 the green globules resembling Protococcus (fig. 2)^ the zoos- 

 pores engendered in these globules (fig, 2) difi^ering manifestly 

 from the ordinary well-knoAvn zoospores of the adult Hydro- 

 dictyon, and, finally, the polyhedral cells (figs. 1.2 — 17), re- 

 sulting from the growth of these particular zoospores, are so 

 many organs comprised in the evolution of one and the same 

 individual, or that they characterise so many difierent stages 

 in the continuous life of Hydrodictyon. 



I must here draw attention to some natural consequences 

 arising from the facts just stated. 



The cells which I have termed polyhedrons, form the first 

 generation of the Hydrodictyon. on its return to active life 

 after a period of repose. This generation is distinguished 

 from those which follow it, inasmuch as the plants to which 

 it gives rise, are perfectly unicellular ; it justifies the view 

 taken by M. Braun of the Hydrodictyons which originate 

 the later generations, and which he regards as so many 



