XI 



LEPTOSPORANGIATJE HETEROSPOREM 



397 





v^•'^il'f,t,.% 1 



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"•"'iG. 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 above; G. sperrna- 

 tozoid (Figs. C, D after Luerssen). 



