— 306 — 



size or unequal ones) and by and by developes a brown, thickened 

 membrane. 



The following stage is drawn in fig. 1, a, which corresponds to 

 Rostrups figures. The double-swellings, before mentioned, are namely 

 now emancipated from the mycelium; the inferior one, the Nehenzelle of 

 the German authors, is hyaline with poor and partly destroyed contents, 

 while the superior one, the young resting spore, appears stuffed with oil 



Fig. 1. Cladochytrium Myriophylli Rostr. 



a and 6: Resting spores with their appendicular cells; c and d: Spores germinating with hyphae; 



€'• A spore being about the metamorphosis into sporangium; /: A sporangium exhausting the 



ripe zoospores; (j: An evacuated sporangium; h — I' Supposed young zoosporangia on hyphae, 



which have been developed by vegetative germination of the resting spores {a— I: ^^/i). 



At this stage the thickness 



— The knots on the stems become mouldering and begin 



and provided with a brownish membrane 

 of the membrane hardly reaches 1 ^^). 



Octob. 26 



to decay. Several of the internodia with knots have sunk to the bottom 

 of the glass. The resting spores unchanged. 



Novbr. 1 . — Most part of the material is now lying on the bottom of 

 the glass; the decaying stems put forth a pair of fresh buds. — On the 



^) The ^iSporangia" with ^endospores", mentioned and figured by Rostrup 

 con'espond to this stage. The closely packed oil-drops, which are often 

 fully equal in size, have really also a striking likeness with spores. 



