70 M c Nicol . — The Bulbils and Pro-embryo of Lamprothamnus. 
Fig. 9. Fully formed tubercle. 
Figs. 10, 11. Beginning of formation of secondary tubercle. 
Fig. 12. Fully formed secondary tubercles. 
Fig. 13. Case in which the primary tubercle has remained elongated whilst the secondary 
tubercles have become spherical. 
Fig. 14. Sequence of 3 tubercles. 
Fig. 15. Group of tubercles showing primary, secondary, and tertiary tubercles in process of 
formation. 
Fig. 16. Fragmented nuclei of a root tubercle, s. Starch grain. 
Fig. 17. Fragmented nuclei of one of the swollen cells of the pro-embryonic apex. 
Fig. 18. Pro-embryo formed from tubercle near the surface of the mud, and consequently 
shortened in growth. A young pro- embryo is also seen to the right. 
