PTERIDOPHYTA 



65 



Fig. 45. Prothallium of Dryopteris, with rhizoids. The under side. Jr. Archegonia. 

 An. Antheridia. 20/1. (From Wettstein, Handb.) 



mc 



Fig. 46. Antheridia and archegonia of ferns. 1-3. Successive stages of an antheridium. 

 gz, cup cell; cz, central cell; st, stalk cell; /, cleavage wall; rg y ring cell; c/z, cup 

 cell. 4. Spermatozoid. 5-7. Successive stages of an archegonium. /;, neck cell; 

 b, basal cell; mc, mother cell of the central row; hkz, neck canal cell; ^z, egg cell. 

 (From Engler and Prantl) 



M. 



