XIII 



LYCOPODINEJE 



491 



species, the two lower quadrants form the foot, which here 

 remains completely buried within the prothallium. From the 

 upper part of the embryo is next developed what Treub calls 

 the "protocorm." This is a tuber-like organ (Fig. 283, D, 



Cot. 



D 



FIG. 285. Embryogeny of Lycopodium plilegmaria (after Treub). st, Stem; cot, 

 cotyledon; susp, suspensor. A, X3I5; B, X-235; C, X23S; D, Xi75- 



pc), from which the leaves and stem apex are subsequently 

 developed. The cotyledon arises from the summit of the pro- 

 tocorm, and is followed by a number of secondary leaves which 



