PLATE 36 



Dietyota flaiellata (Collins) S. and G, 



Fig. 13. A group of mature hairs. X 125. 



Fig. 14. Young plants growing in position from tetrasporangia before 

 division. X 125. 



Fig. 15. Same as fig. 14, further advanced. X 125. 



Fig. 16. Cross-section of a frond showing the early stage in the develop- 

 ment of hairs and young tetrasporangia. X 125. 



Fig. 17. A mature tetrasporangium. X 125. 



HeterocJiordaria abietina (Eupr.) S. and G. 



Fig. 18. Portion of a cross-section of a frond showing zoosporangia, para- 

 physes, and hairs. X 250. 



Fig. 19. A group of gametangia as seen in cross section. X 250. 



Zonaria Farlowii S. and G. 



Fig. 20. A longitudinal section at the margins (a) and through a young 

 sorus (&). X 125. 



Neurocarpus zonarioides (Farlow) Howe 



Fig. 21. Habit sketch of a portion of a frond showing the distribution of 

 the sori along the mid-rib. X 2. 



Balfsia californica S. and G. 



Fig. 22. Section perpendicular to the surface of a frond showing the char- 

 acter of the basal cells, and zoosporangia and paraphyses in various stages of 

 development. X 125. 



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