1920] 



A RBER—PH YLLODES 



339 





varyin 



and 



stalk 



may 



p). The 



HYACINTHUS 



b 



LB 



f> 



HYACINTHUS 



FATS I A 



SCILLA 



TULIPA 



Figs. 1-4. — Fig. 1, Fatsia japonica Decne. : A, small normal foliage leaf; 

 b, leaf-base; p, petiole; B, bud T scale; b, leaf-base; p, rudiment of petiole; C, trans- 

 verse section of apex of bud-scale at position marked with arrow in B; A and B, half 

 natural size; C, X2$; fig. 2, Hyacintkiis (garden var.): A 7 apex of leaf (half natural 

 size); B, transverse section through apex of leaf shown in /I, at level of arrow; X2$; 

 kg- 3> Scilla (garden var.) : transverse section through apex of leaf which was flat and 

 dorsiventral except at tip; X14; fig. 4, Tnlipa sylvestris: transverse section through 

 a pex of leaf which was flat and dorsiventral except at tip; form on upper side shows 

 first indication of opening into main flat part of leaf; X23. 



transverse section of this region shows a slightly dorsiventral ring 

 of bundles (fig. iC), so that the anatomy is distinctly petiolar. 



When we turn to the monocotyledonous leaves which we wish 

 to interpret, we find that in certain of them there is an apical 

 structure which closely parallels the petiole rudiment of the 



