1915 Frye and Zeller; on Hormiscia 13 



Explanation of Plate 2 



1. Habit sketch. XL 



2. Normal vegetative cell. X75. 



3. Holdfast. X75. 



4. Akinete with neck growing through a collar formed of the partially 

 absorbed contents of the cell below, X75. 



5. A typical akinete which has grown through two cell walls. X75- 



6. A zoosporangium showing the arrangement of zoospores within. X75. 



7. Zoospore, side view. X350. 



8. Zoospore, anterior view. X350. 



9. Zoospore. X800. 



10. Zoospore rounded up, side view. X350. 



11. Zoospore rounded up, anterior view. X350. 

 12 — 15. Germinating zoospores. X350. 



16. Germinating zoospore showing an early stage in the formation of 

 the holdfast. X350. 



17. Gametangium. X75. 



18. Gamete, anterior view. X350. 



19. Gamete, side view. X350. 



20. Gametes fusing. X350. 



