13 



CUPRESSUS: 



Megaspore meinl)rane: Ciij)rcssus arizonka, see Fig. 37, p. 2\\; C. whitlcijana, 

 see Fig. 38, p. 24. 



CYCAS (see also Fig. 31 B, p. 20):— 



Fig. 17. Cycas rcvohitn; outline of transverse median section (upper detail- 

 figure); proximal face (lower detail-figure). 



Fig. 18. Cycas revohita, sections through part of acetolyzed pollen walls: cf. 



tangential, + oblique section (left); + radial section (right; x 34,000). The 



black horizontal line indicates 1 pi- EMG B. M. Afzelius. 



DACRYDIUM:— 



Megaspore membrane: D. ciipressimiin (Fig. 19). 



Pollen grains: D. araucarioides (Fig. 20 B), D. bidivillii (Fig. 21), D. ela- 

 tum (Fig. 20 A), D. falcifonne (Fig. 22), D. fonkii (Fig. 23), D. franklinii 

 (Fig. 24), D. guilkmminii (Figs. 25 and 26), D. taxoides (Fig. 27). 



