Photos by Robert W. Bowker
| Male (upper) and female (lower) pine cones
|
Close-up of male pine cones
Photos by Robert W. Bowker |
Longitudinal section, female cone
 |
Close-up of scales on female
cone. "X" marks an ovule. 
Photos courtesy of the University of Wisconsin-Madison, teaching/reference collection |
Longitudinal section, male cone
 |
Close-up of scales on male
cone. The "X", inside a pollen sac, is surrounded by pollen grains (male gametophytes). 
Photos courtesy of the University of Wisconsin-Madison, teaching/reference collection |