SEED-BEARING PLANTS 399 
the megaspores of Cycads never leave the sporangium. The 
developing female gametophyte is nourished entirely as 
FIG. 296. Ovule of Macrozamia Moorei. A, external view; B, portion 
of integument removed, showing egg-shaped gametophyte. The dark 
atrip on the upper left-hand portion of the latter is where a piece of the 
now membranous nucellus was peeled off; C, gametophyte, entire, with 
nucellar cap at the upper end; D, longitudinal section; E, end view, with 
^art of the integument removed, disclosing the tiny crater-like pollen- 
chambers, at the bottom of which the necks of the archegonia open. (Cf. 
Fig. 297.) About natural size. 
a parasite, by the tissue of the nucellus. The latter 
becomes almost entirely consumed, so that when a longi- 
