96 



THE OI'HIOGLOSSALKS 



case is shown in rig. 82, E, where the lamina is almost entirely suppressed and the 

 terminal character of the spike is very evident. 



As the leaf develops, there is a very great increase in size in the lamina, which, 

 as we have seen, may reach a great length. The anatomical structure of the leaf 



Fig. oa. — Ophioglossum pendulum* 



A. Section of stem apex, X3. 1). The stem apex, more enlarged. 



B. Young sporophvll. sp, sporangiophore. X35. K. Very young sporophyll. sp, sporangiophore. 9 



C. Stem apex, .v, arul youngest leaf, /. F. Cross-section of young sporangiophore. 



closely resembles that of Euophioglossum, hut the stomata are much largci and 

 around the stoma is a concentrically arranged series of cells, indicating that probably 

 the formation of the mother cell of the stoma is preceded by a series of preliminary 



I 1 ' -Vasculai bundle from petiole ol '' 

 sum pendulum* 



I ,...66. 



\. Section ol !• nole of a sporophyll of 0. pendulum. 

 It. Section ncai ba 1 ol lamina. Sybase of spike. 

 C-E. Section) ol peduncle of spike. C ami 1) are from the 

 same leaf; K from a laigcr one . 



divisions in the epidermal cell. The tissues in the petiole are very like those in the 

 lamina of the leaf except that they are somewhat more compact. The walls of the 

 ground tissue in this region are very deeply pitted. 



The structure of the vascular bundle of the petiole (rig 65), is much like that in 

 Euophioglossum, except that there is a rather greater development of tissue upon the 



