12 
STKUCTL'UE. 
of two kinds. One kind, the more numerous, called " an- 
theridia," consist of somewhat globular cells seated on 
Figs. 7 to 10. Antheridia: flg. 7, & containing vesicles, (/burst; 
8, side view of 4; 9, the same, discharging the vesicles ; which 
latter discharge the spiral filaments e aud Jig. 10. 
and arising from single cells of the leafy scale; these 
produce each in its interior a number of minute vesicles, 
within each of which is coiled up a spiral filament, con- 
sisting of a delicate thread with a thickened vescicular 
club-shaped extremity, which is furnished with cilia. At 
a certain epoch the globular cell bursts and discharges 
the vescicles, and the enclosed spiral filaments then make 
Figs. 11 to 13. Ovule: 11, side veiw ; 12, summit seen from 
above ; 13, vertical section, showing embryo ce:l In the cavity. 
