34 

 PILGERODENDRON:— 



Fig. 54. Pilgerodendron iwif'enim. From left to right: two pollen grains ( x 250); 

 distal face (surface and optical section; x 1000); exine stratification ( x 2000); 



LO-patterns. 



PINUS:— 



P. canadensis (Fig. 55), P. excelsa (Fig. 57), P. nmgo (Fig. 56), P. pence 

 (Fig. 55), P. pinea (Fig. 55), P. tlmnhergii (Fig. 58). 



50 



100,u 



Fig. 55. Left, Pinus pence (siibg. Haploxylon). Centre, P. canariensis (subg. 

 Diploxylon, sect. Sula). Right, P. pinea (subg. Diploxylon, sect. Pinea). 



x 250. 



Fig. 56. Pinus imigo; section through saccus and, in the lower right-hand 

 corner, part of the exine in the proximal face. About x 1000. 



