Holden— Some Wound Reactions in Filicinean Petioles . 793 
Fig. 8. L. Filix-mas. Small portion of section, showing solid deposit of gum traversed by 
cracks, also neighbouring cells with granules ; one cell shows the pits in the wall in surface view, 
x 600. 
Fig. 9. Scolopendrium vulgare. Transverse section of petiole in region of pinna-insertion, 
showing cell elongation for an exceptional depth, x 250. 
Fig. 10. Cells from various forms, showing pathological nuclear effects. b, Lastraea Filix- 
mas ; c, d, e. Scolopendrium vulgare (d and e show gum deposits) ; f, Woodwardia oriental! s , with 
Bacteria, a-f x 750. 
Fig. 11. Woodwardia orientalis. Transverse section of petiole in region of pinna-insertion, 
showing division and suberization of cortical cells, x 250. 
PLATE LXXIV. 
Fig. 12. Davallia polyantha . Transverse section of petiole below region of pinna-insertion. The 
cortical cells are heavily thickened, the outer ones contain abundant gum, and the connecting pits are 
well marked, x 250. 
Fig. 13. Woodwardia orientalis. Petiole infected by Bacteria, showing local dilatation, x 1 . 
Fig. 14. W. orientalis . Transverse section of infected area of same with suberized layer below, 
x 250. 
Fig, 15. Davallia polyantha. Small portion of petiole, showing difference in character of endo- 
dermal thickenings and those of other parts of the cortex, x 600. 
Fig. 16. Scolopendrium vulgare . Small portion of epidermis to show slight growth of deposit 
of gum, due to wound stimulus, x 500. 
Fig. 17. Polystichum proliferum . Single vascular bundle from extreme apex, showing effect of 
wounding on young phloem and xylem-elements. x 600. 
Fig. 18. Woodwardia orientalis . Small portion of infected petiole in Fig. 13, showing edge 
of wounded area, x 400. 
Fig. 19. Asplenium Belangeri. Small portion of cortical parenchyma of wounded apex, 
illustrating method of growth of secondarily active cells. The intercellular spaces are darkened, 
x 600. 
Fig. 20. A. Belangeri. {a) Curled apex of petiole in transverse section to show division of 
cortical cells, epidermis, and endodermis. Slightly diagrammatic, x 300. ( b ) Diagram showing 
area (lightly shaded) containing gum deposit. 
Fig. 21. Bowenia serratula. Portion of petiole in transverse section, showing true wound 
periderm. Specimen from Kew. x 120. 
Fig. 22. Pteris cretica. Petiole, showing flexure due to wounding, x 1. 
Fig. 23. Woodwardia virginica. Transverse section of petiole, showing cell-elongation and 
slight cellulose thickening, x 400. 
