I'l. 1\'. FuiKirid hii<ir()iiivlri(ii. l^M(i 1). von We'tlslein. a, scclion lliiHuii^li pari 

 of a spore; M, initocliondiia; P, plaslid. x 23,000. — b, ohlicpie section ol' 

 sporodt'iin (inline and l\\ o-layercd exine) <;U,000. — c, radial (per])endie- 

 ular) section through s[)oroderni; cvtophisni, intine, and t'xini' closely 



connected, x 34,000. 



