618 - Heredity and Evolution 



Fig. 31-25. Pines and other gymnosperms produce two kinds of cones. Below, a cluster of staminate cones 

 (which produce the microspores, or pollen), surrounded by needlelike leaves. Above, two pistillate cones (which 

 produce ovules and seeds), flanking a young leaf-bearing shoot, and surrounded by mature leaves. Two very 

 small, young pistillate cones may be seen at the top of the new leaf-bearing shoot. Both photos are of the Austrian 

 pine (Pinus nigra). (Copyright General Biological Supply House, Inc.) 



