392 



VASCULAR CRYPTOGAMS. 



Stem itself, and very near to the leaves ; but at a later period tliey appear lateral near 

 the leaves, not axillary; and, as regards their first origin, which has not yet been 

 accurately ascertained, I am inclined to think, from some -of Hanstein's figures and 

 from my own previous observations, that there is dichotomy of the stem, which, with a 

 cymose development of the forked branches in a sympodial manner, might well lead 

 to the arrangement of the older parts which has been described. But here, as in 

 the Ferns, we have to wait for a new series of observations on the first origin of 

 the branches. 



Fig. 292.— Anterior part of the stem ot jl/arszVea sal- 

 •vatrix with leaves (reduced one-half) ; A'terminal bud, bb 

 leaves,^ sporocarps springing from the leaf-stalks at a:. 



Fig. ■z<)-i,.—Pilulayia globulifera ; A natural size, B end 

 of a shoot magnified, j terminal bud of the stem, bb leaves, 

 tv roots.ysporocarps, A' lateral bud. 



The Growth of the Roots of Marsileacese, and their monopodial branching, 

 agrees with that of Ferns and Equisetacese in all important points (Figs. 293 £7, 

 293 b). 



The Sporangia of Rhizocarps are formed in hollow, capsular, stalked recep- 

 tacles, closed on all sides, usually termed Sporocarps. In Salvinia they are meta- 

 morphosed teeth of the submerged leaves ; in Marsilea their stalks (which in this 

 genus are sometimes very short, but occasionally very long) spring from the outer 

 or lower side of the leaf-stalk, or they appear quite at its base and by the side of the 



