FIG. 257. A group of gymnosperm cones, of which all except B are carpellate 



A, white spruce (Picea excelsd), one half natural size; B, white spruce; 



C, western hemlock (Pseudotsuga taxifolia), one fourth natural size, branch 



and staminate cones almost natural size; D, arbor vitae (Thuja occidentalis), 



almost natural size 



310 



