118 Sinnott.—Foliar Gaps in the Osmundaceae . 
Fig. 7 . 71 hymenophylloides . Apparently gapless condition at the departure of a leaf-trace, 
x 40. 
Fig. 8. T. hymenophylloides. The narrow gap which eventually appears opposite the trace 
shown in Fig. 7. x 200. 
Fig. 9. Osmunda regalis. Section of a young plant, showing two departing traces and their 
subtended gaps, x 60. 
Fig. 10. Todea hymenophylloides . Section through the slender base of a stem, showing two 
traces in the early stages of departure, and three foliar gaps. X 40. 
Fig. 11. Osmunda regalis. Showing the gap formed in the leaf-bundle by the trace departing 
to the pinna, x 40. 
Fig. 12. O. regalis. Condition of affairs slightly higher up than in Fig. 11, showing the 
apparent absence of a gap at the departure of a trace to a pinna, x 40. 
Fig. 13. 0. cinnamomea. Trace to the pinna being constricted off from the leaf-bundle, x 60. 
Fig. 14. 0. Claytoniana. ‘Pinna-gap,’ affecting only the xylem of the leaf-bundle, x 40. 
Fig. 15. Todea bai'bara. Early stage in the departure of the trace to the pinna, showing complete 
break in the leaf-stele, x 40. 
Fig. 16. T. hymenophylloides. Leaf-bundle, showing two ‘pinna-gaps’ and the trace sub¬ 
tending one of them, x 40. 
Fig. 17 . T. Frazeri. Leaf-bundle with two ‘pinna-gaps’ which do not quite break through 
the stele, x 40. 
Fig. 18. T. superba. Leaf-bundle, with two traces departing to the pinnae, showing the 
complete gaps in the leaf-stele, x 40. 
