XIII 



LYCOPODINE^ 



491 



Species, the two lower f|iia(lrants form the foot, which here 

 remains completely buried within the prothallinm. h^'om the 

 upper part of the embryo is next developed what Treub calls 

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



Fig. 285. — Embryogeny of Lycopodium phlcgmaria (after Treub). st, Stem; cot, 

 cotyledon; sitsp, suspensor. A, X315; B, X235; C, X235; 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 



