Lehman: Conidial Formation in Sphaeronema 163 



Fig. i. Conidiophore producing hyaline conidia. 



Fig. 2. Cluster of three conidiophores producing hyaline conidia. 



Figs. 3 and 5. Conidiophores with hyaline conidia escaping. 



Fig. 4. Conidiophore out of which all conidia have been forced by growth 

 of the protoplast behind them preparatory to formation of other conidia. 



Figs. 6 and 7. Conidiophores. See text for explanation. 



Fig. 8. Distal end of a conidiophore showing two fully formed conidia 

 within the unbroken sheath. 



Fig. 9. Similar to Fig. 8, but showing only one conidium within the 

 sheath. 



Fig. 10. The tip of the conidiophore has been dissolved and the first- 

 formed conidium is being slowly shoved out by growth of the protoplast be- 

 hind it. 



Fig. 11. Conidiophore shortly before formation of the first conidium. 



Fig. 12. Conidium germinating while still within its sheath. 



Fig. 13. Group of conidiophores producing olive conidia. 



Fig. 14. Higher magnification of Fig. 13 (a) showing how the protoplast 

 grows out to form the first olive conidium. 



Fig. 15. Chain of olive conidia showing variation in shape and size and 

 how each conidium is delimited by a wall below the mouth of the conidiophore. 



Fig. 16. Conidiophore with an olive conidium plugging its mouth. 



Fig. 17. An unusually long conidiophore of this type. The conidium is 

 completely delimited but has not assumed its final shape. 



Figs. 18, 19. Olive conidia with thick .walls characteristic of mature 

 spores. 



