CONIFERALES (PINACEAE) 



279 



(figs. 322-327) and Cupressineae (figs. 328-331) usually two equal 

 male cells are produced, and both cells may function and have been 

 observed (72, 173) to function, since fertilization occurs in an arche- 



:^ii?^^^'v:^ 



322 



324 



323 



32/ 



Figs. 322-327. — Pollen tube structures of Taxodineae: fig. 322. Taxodium 

 distichiim; the two male cells with stalk and tube nuclei in advance; X540; after 

 CoKER (76); figs. 323-325, Ciiuninghamia sinensis, fig. 323 showing the pollen grain 

 with generative cell (no prothallial cells) and tube cell, fig. 324 the body cell with 

 stalk and tube nuclei in advance, and fig. 325 the two male cells; X430; after IMiy.\ke 

 (147); figs. 326, 327, Crypiomeria japonica, fig. 326 showing the body cell with stalk 

 and tube nuclei in advance, and fig. 327 the two male cells; X666; after Lawson (93). 



