98 



may occur upon the ventral surface of the midrib, Init are 

 more numerous upon the flanks of the midrib. The neck 

 may be straight or curved forward. 



12. The neck is very long; the neck-canal-cell, except in G. 

 2)oh/podioides, commonly divides into two cells. The basal 

 cell is conspicuous. 



13. The embryo, so far as could be ascertained, closely resem- 

 bles in its early divisions that of the Polypodiaceae. 



14. Cotyledon, stem and root show distinct single initial-cells; 

 the apical cell of the leaf is two-sided; that of the stem 

 and root, tetrahedral. 



15. The cotyledon in G. pecthiata, G. dichotoma and G. laevi- 

 gata shows a prolonged apical growth like that found in 

 the adult leaves of the young sporophyte. Stomata occur 

 only upon the lower side. 



16. The vascular bundle of the stem of the young sporophyte 

 in G. dichotoma and G.pectinata is a solid cylinder „protostyle". 



17. The early roots are diarch. 



