Fig. 23. Lycopodium cermium and L. lateiale 



A-E, L. ccrnimm. A, Young embryo emerging from the prolhallus, p; a, neck of 

 archegonium; ,s», suspensor; /, foot; I-I, position of first partition wall; /, position 

 of first leaf primordium; /, beginning of tuberous development. B, As before, the 

 tuber is now becoming conspicuously developed. C, An older embryo showing the 

 group of primary awl-shaped leaves, the tuber, with rhizoidal development, the 

 suspensor and foot. D, An embryo in l.s. showing the enlarged cells of the foot, 

 containing starch grains. E, An older embryo showing the remarkable tuberous 

 development and the somewhat irregular sequence of leaves. (A, x 200; B, x 140; 

 E, X 23; D, X 27; after Treub). F-H, L. laterale. Tuberous embryos, like those 

 of L. cernuum, showing linear sequence of leaves (/) along the upper surface. H, An 

 older embryo in which the normal leafy shoot has eventually been formed; /% first 

 root. (F, X 11; G, X 8; H, X 3; after Holloway). 



