478 Agnes Arber .— The Phyllode Theory of 
with inverted bundles as representing two comparable phases of phyllodic 
structure, between which transitions can be traced ; to this point we shall 
return later . 1 
(ii) List of genera in which phyllodic leaf anatomy has been 
observed among Monocotyledons . 2 
HELOBIAE. 
POTAMOGETONACEAE. Cymodocea , sub-genus Phycoschoenns? 
SCHEUCHZERIACEAE. Triglochin 4 * (Fig. IO, p. 479). 
Scheuchzeria? 
Alismataceae. (l) 
Butomaceae. 
Hydrocharitaceae. 
SPATHIFLORAE. 
Araceae. 
FARINOSAE. 
PONTEDERIACEAE 
(L) 
(L) 
(L) 
(E) 
(L) 
LILIIFLORAE. 
JUNCACEAE. 
(L) 
(L) 
Liliaceae. 
Melianthoideae. 
Tofieldeae. 
Sagittaria (a.A.) (Fig. n,p. 479, and Figs. 31 
and 32, p. 492). 
Butomus . 6 
Enalus? 
Stratiotes? 
Hydro char is? 
Limnobium . 8 
Hydro my stria . 8 ' 
Acorns * (Fig. 18 A and B, p. 483). 
Eichhornia (a.A.) (Fig. 24, p. 489, and Fig. 25, 
P . 490). 
Heteranthera (A.A.) (Figs. 29 and 30, p. 490). 
Pontederia (a.A.) (Fig. 23, p. 489, and Figs. 26 
and 27, p. 490). 
Distichia . 9 
Oxychloe . 9 
fimcus 9 * (certain species). 
(e) NartheciumH * 
(e) Tofieldia 10 * (Fig. 20, A-c, p. 483). 
(E) PleeaH 
(e) NietneriaH 
1 p. 482. 
2 In this list the Families are arranged mainly according to A. Engler and E Gilg’s Syllabus der 
Pflanzerifamilien, 7th edition, 1912. 
3 Sauvageau,C. (1891). See note on p. 481. 4 Areschoug, F. W.C. (1878). See note on p.482. 
6 Raunkiser, C. (1896). 6 Sauvageau, C. (1893). See note on p. 482. 
7 Magnus, P. (1870). 8 Solereder, H. (1913). 
9 Buchenau, F. (1906). 10 Schulze, R. (1893). 
