131 



MORPHOLOGY OF ANGIOSPERMS 



(Trye 56 ), and Barcodes (Oliver 18 ). Both methods are often 

 found in the same species and even in the same anther, as in 

 Lilium (Fig. 63). 



The free generative cell finallv assumes a varietv of forms, 

 the most common being lenticular, the cytoplasm massing chiefly 



Pig. 63. — Male gametophyte at time of shedding. J3, 0, Lilium auratum; the others 

 L.tiijiinum; x 500. A, generative cell against side of microspore ; .5, generative 

 cell in body of microspore ; the two male nuclei already formed ; <~\ three male 

 nuclei within generative cell, an unusual case; /'.two male nuclei, differing in size, 

 within generative cell; E, tube-nucleus divided, giving rise to six nuclei: /'. nn 

 unusual case, showing tube-nucleus, two generative cells (g), and a " prothallial " 

 cell (pn. — After Chamberlain. 33 



at two opposite poles of the nucleus. In some cases a spherical 

 form is maintained, as in Acer (Mottier 22 ) ; in others the len- 

 ticular form passes into the vermiform, becoming elongated and 



