XI 



LEPTOSPORANGIATM HETEROSPOREM 



397 









Fig. 233.—Salvinia natans. A, Small plant, X2, seen from above; B, a similar one 

 from below; w, root-like submerged leaf; C, fragment of a fruiting plant, X2; sp, 

 sporocarps; D, a macrosporangial (ma) and microsporangial (mi) sporocarp in longi- 

 tudinal section (slightly magnified); E, male prothallium with the single anther- 

 idium (an) from the side, Xiooo; F, a similar one seen from above; G. sperrna- 

 tozoid (Figs. C, D after Luerssen). 



