78] 



The Classification of Lower Organisms 



,^t*SJi 



' •ITi''!' nVgi 'Villi 



Fig. 14. — Oomycetes: a. Filaments and sporangia of Dictyuchus sp. x 50. 

 b, C, Zoospores of the second stage of swimming, of Achlya caroliniana and Sapro- 

 legnia ferax, after Couch (1941) x 1,000. d^ Oogonia and antheridia of Dictyuchus 

 X 400. e, f, g, Saprolegnia mixta after Davis (1903) : e, developing oogonium with 

 numerous nuclei x 500; f, metaphase of nuclear division x 2,000; g, developing 

 oogonium in which most of the nuclei have undergone degeneration; a few have 

 become associated with coenocentra, and the cytoplasm is undergoing cleavage to 

 produce eggs about these. 



