29 
| Monosp. sacs Bispor. sacs | Trisp. sacs Tetrasp. sacs 
3 megaspores formed 
normal walls Type B 
very common 
only 1st. div. Type Ba Type BB 
walls | Gyrostachys 
(Pace 1914) 
no walls (Type Be) (Type BBz) (Type BBB) 
2 megaspores formed 
normal walls Type CG 
Trillium 
(Ernst 1902) 
no walls Type Ca Type CC. 
Piper (PALM 
4915) | (SamuEzs 1912) 
Embryosac mothercell = megaspore 
Type D 
Plumbagella 
(DAHLGREN 
1915, 1916) 
Before passing on to the study of the further development 
of the embryosac, three observations must still be made. 
Attevtion must be called to the system which underlies our 
indicating the various types by the formules used in fig. 3 
and fig. 4. 
letter A : 4 megasp. are formed | 1 capital: monosporical sac 
B:3 . 29, 8: bisporical " 
' C 2 é ‘ ‘ 3, 8: trisporical > 
» D:megasp. form. sup- |4 » %: tetrasporical , 
pressed 
1 desintegrating megasp. nuc]. in the same sac 
Qt 
‘ ? ” ? ” 9 
ie : 9 ” ” b 
a 
” 3? ” ”7 
3 ” ” ”? 
