378 MR R. C. DAVIE ON THE PINNA-TRACE IN THE EERNS. 



EXPLANATION OF PLATES. 



All the figures are from untouched microphotographs. 



Plate XXXIII. figs. 1-8. 



Fig. 1. Transverse section of the petiole of Asplenium obtusatum, Forst., showing the departure of the 

 vascular supply to the two basal pinnae, x 38. 



Fig. 2. Transverse section of the petiole of Davallia pallida, Mett., showing one pinna-trace nipped off 

 from the leaf-trace, and the other in process of development. x 42. 



Fig. 3. Transverse section of the petiole of Aneimia hirta (L.) Sw., showing the departure of traces to the 

 basal pinnae, x 40. 



Fig. 4. Transverse section of the petiole of Aneimia collina, Raddi. x 20. 



Fig. 5. Transverse section of the petiole of Loxsoma Gunninghami, R. Br., showing development of 

 pinna-trace. x 30. 



Fig. 6. Transverse section of the petiole of Loxsoma Gunninghami, showing departure of pinna-trace, x 30. 



Fig. 7. Transverse section through one of the adaxial bundles of the petiole of Didymochl&na truncatula 

 (Sw.) J. Sm., showing the development of the " extramarginal " type of vascular supply to the basal 

 pinna. x 55. 



Fig. 8. Transverse section of the petiole of Leptopteris hymenophylloides, A. Rich., showing the departure 

 of one of the pinna-traces. x 44. 



Plate XXXIV. figs. 9-15. 



Fig. 9. Transverse section of the petiole of Odontosoria chinensis (L.) J. Sm., var. Veitcliii, below the 

 basal pinnae, showing the development of the pinna-traces. x 44. 



Fig. 10. Transverse section of the petiole of Hymenophyllum demissum (Forst.) Sw., showing one pinna- 

 trace separated from the leaf-trace, and another in process of separation, x 42. 



Fig. 11. Transverse section of the petiole of Blechnum orientale, L., showing the development of one of 

 the basal pinna-traces. x 40. 



Fig. 12. Transverse section through one of the strands of the leaf- trace of Gymnogramma Pearcei, 

 Moore, var. robusta, showing the pinna-trace in process of being given off. x 40. 



Fig. 13. Transverse section of the petiole of Balantium eulcita (L'Herit.) Klf., showing the extension 

 and buckling of the ends of the leaf-trace prior to the departure of the pinna-trace, x 20. 



Fig. 1 4. Transverse section of the petiole of Gleichenia flabellata, R. Br., showing the formation of the 

 isolated cylindrical strands before the pinna-traces depart. x 33. 



Fig. 15. Transverse section of the petiole of Histiopteris incisa (Thbg.) J. Sm., showing the development 

 of two pinna-traces. x 30. 



Plate XXXV. figs. 16-23. 



Fig. 16. Transverse section of the petiole of Histiopteris incisa (Thbg.) J. Sm., showing the completion 

 of one of the pinna-traces. x 33. 



Fig. 17. Transverse section of the petiole of Botrychium lunaria (L.) Sw., showing the formation of one 

 of the pinna-traces. x 33. 



Fig. 18. Transverse section of the petiole of Odontosoria retusa (Cav.) J. Sm., showing one pinna-trace 

 free from the end of the leaf-trace, and the other in process of development. x 30. 



Fig. 19. Transverse section of the petiole of Onoclea sensibilis, L., showing the method of vascular supply 

 to the basal pinnae. x 46. 



Fig. 20. Transverse section of one of the adaxial strands of the leaf-trace of Drynaria rigidula (Sw.) 

 Bedd., showing the separation from it of a pinna-trace. x 53. 



Fig. 21. Transverse section of the petiole of GheilantJies myriophylla, Desv., var. elegans, showing the 

 method of separation of the basal pinna-traces. x 33. 



Fig. 22. Transverse section of the petiole of Pteris cretica, L., showing the extension of the ends of the 

 leaf-trace, prior to the departure of the basal pinna-traces. x 33. 



Fig. 23. Transverse section of the rachis of the leaf of Aneimia collina, Raddi, showing the method of 

 vascular supply to the last two pinnae. x 42. 



