LEPTOSPORANGIATM HETEROSPOREM 



Z97 



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 (mt) 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 dbove; G. sperrna- 

 tozoid (Figs. C, D after Luerssen). 



