BLASTOCLADIALES 77 



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BLASTOCLADIALES 



The Order Blastocladiales includes about 15 species belonging 

 to 4 orenera. All are filamentous aquatic fungi with a more or 

 less well-developed m\xelium. In this group the cell walls do 

 not stain blue w^ith zinc chloroiodide, an indication of the absence 

 of cellulose. Asexual reproduction occurs by means of thin- 

 walled zoosporangia and zoospores, which are characteristically 

 uniciliate, as they are in the Monoblepharidales and certain of the 

 chvtrids. 



All representatives of the order produce, in addition to the 

 thin-walled sporangia, thick-walled resistant sporangia of a type 

 not known elsewhere among the fungi. From these persistent 

 structures with pitted walls there are produced after a dormant 

 period zoospores similar to those formed in the thin-walled 

 sporangia. 



The Genus Blastocladia contains about seven species, of which 

 the best knowil is B. pr'mgsheimii. Species of Blastocladia occur 



