XIII 



LYCOPODINE^ 



521 



four-sided one, from which arc then ])roduced two similar ones 

 by the formation of a mc(han waU, and a true dichotomy of tlie 

 primary axis thus takes place at once, the two new branches 

 growing out at right angles to the cotyledon. \Yhile this may 

 also occur in .V. Kranssiana (Fig. 30T, D), it is not always the 

 case, and frequently the young plant remains unbranched until 

 it has reached a length of a centimetre or more, and has pro- 

 duced numerous leaves. 



Cot. 



Fig. 301. — Selaginclla Kranssiana. A, Macrospore with the prothallium (pr), X50; I*> 

 young sporophyte still attached to the spore (sp) , X8; cot, cotyledons; R, root; C, 

 upper part of an older stage, X6; D, a still older one showing the first di- 

 chotomy, X4- 



The embryo of ,5^. spimdosa (Bruchmann (4)) has a short 

 and massive suspensor, and no foot is developed. 



Miss Lyon (2) found that in both 5^. apus and 5^. riipcstris, 

 fertilisation occurred wdiile the spores were still within the spo- 

 rangium, and the sporangium attached to the strobilus. ''The 

 strobilus of S. rnpcsfris retains its physiological connection 



