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



A, white spruce (Ficea excelsa), one half natural size; B, white spruce; 



C, western heinlocli (Psevdotsuga taxlfolia), one fourth natural size, branch 



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



almost natural size 



310 



