Plate XVII. Helicostyluni piriforme Bainier. 



Figure 8. Lateral cluster of sporangioles ; obj. Smni., oc. lOx. 



Figure 9. Short lateral branch after the three sporangioles have fallen; obj. 8mm., 



oc. lOx. 

 Figure 10. Habit sketcli: (free-hand drawing). 

 Figure 11. Single sporangiole; obj. 4min., oc. lOx. 

 Figure 12. Median oi)tical section through almost mature .sporangium; obj. l(jmm., 



oc. lOx. 

 Figure 13. Columella of sporangium; obj. 16mm., oc. lOx. 

 Figure 14. Terminal cluster of sporangioles; obj. Smm., oc. lOx. 

 Figure 1.5. Spores; obj. -Imm., oc. lOx. 

 Figure 16. Upper part of sporangiophore with branches from which sporangioles 



have fallen; obj. 8mm., oc. lOx. 



The drawings were outlined with the aid of a camera lucida with the combinat'on 

 of Bausch and Lomb lenses noted and reduced about one-half in reproduction. 



