XIV 



L YCOPODINE.E 



483 



TJie Sporangia 



There has been much disagreement as to the mori)hological 

 nature of the sporangiophores of the Psilotaceae. The two 

 chief views are the following/ ( i ) That the whole sporangio- 



FlG. 252. — Tmesipteris ianncnsis (Bernho). A, Radial section of the young sporangiophore, X 112 ; sy, 

 the young synangiura ; B, similar section of an older sporangiophore, X112. The archesporial 

 cells are shaded. C, Fully-developed synangium, showing its position between the two lobes of 

 the sporophyll, x 3 ; D, a longitudinal section of the synangium, showing the two loculi (all the 

 figures after Bower). 



phore is a single foliar member ; (2) that it is a reduced axis 

 bearing a terminal synangium and two leaves. The recent 

 very careful researches of Bower upon the origin of the 

 sporangiophore and synangium confirm the former view. He 

 describes the development in Tuicsipteris as follows. " The 

 apical cone of the plant is very variable in bulk. ... In the 



1 Bower (15), p. 541. 



