PLATE 49 



ACHLYA DUBIA 



Fig. I. A row of gemmae, most of which ha\e already formed and discharged spores. X 



167. 

 Fig. 2. Two threads both bearing sporangia, one with an oogonium, the other with anther- 



idial branches. X 167. 

 Fig. 3. A sporangium beginning to disorganize on one side; below it a younger sporangium 



cut from the main thread and with spores emptied as in Achlya. X 167. 

 Fig. 4. A sporangium (with tip cut off as in most cases), the spores sprouting through the 



wall. Through these tubes the spores emerged as in Dictynchus. X 167. 

 Fig. 5. A sporangium well advanced toward dissolution. X 167. 

 Fig. 6. A sporangium still further disorganized attached to a younger sporangium which 



has discharged spores as in Achlya. X 167. 

 Fig. 7. Asporangium with the walls all gone, the tip showing two unde\eloped cells. X 167. 

 Fig. 8. A disorganizing sporangium with two discarded and disorganizing cells at both 



tip and base; below a segment is developing into a sporangium. X 167. 

 Fig. 9. A group of liberated spores, some with abnormal size and shape. X 167. 

 Fig. 10. A sporangium in which disorganization of the wall began near the tip. X 167. 

 Fig. II. A sporangium discharged as in Achlya, with some of the spores escaped from their 



cysts. X 167. 

 Fig. 12. An oogonium with fully mature (rather old) eggs, two with many oil drops, one 



(the more common case) with only a single drop (antheridium too far dis- 

 organized to be shown). X 447. 

 Fig. 13. A young oogonium with a typical antheridial branch. X 167. 

 Fig. 14. A dictiosporangium with an empty sporangium below. X 167. 

 Fig. 15. An oogonium with maturing eggs, the antheridium still visible. X 447. 

 Fig. 16. Two Achlya-Vike sporangia, the lower emptying from one side. X 60. 

 Fig. 17. Spores in the swimming stage (cilia not shown). X 4i7- 

 Fig. 18. A hypha with racemosely arranged oogonia (typical) and a large terminal one. 



Most of the oogonia were halted in their development and did not mature. 

 Antheridia are attached only to those which are maturing normally. X 108. 



