ORDER BLASTOCLADIALES 



83 



Fig. 24. Blastocladiales, Family Blastocladiaceae. (A-D) Blastocladiella cystogena 

 Couch and Whiffen. (A) Plant with mature resting sporangium. (B) Uniflagellate 

 zoospores, two greatly magnified, just after discharge from resting sporangium. (C) 

 Cysts, some still containing and some discharging gametes. (D) Biflagellate zygote. 

 (E) Blastocladiella asperosperma Couch and Whiffen, cluster of plants, some with rest- 

 ing sporangia and some with thin-walled sporangia. (F, G) Blastocladia pringsheimn 

 Reinsch. (F) Plant with thin-walled sporangia. (G) Resting sporangia. (A-E, cour- 

 tesy. Couch and Whiffen: Am. J. Botany, 29(7):163-193. F-G, courtesy, Thaxter: 

 Botan. Gaz., 21(2):45-52, Univ. Chicago Press.) 



