XLVIIl] 



PITYOSTROBUS 



391 



ovule shown in fig. 784, A, the contracted nucellus, n, forms a 

 cylindrical column which presents a misleading resemblance to the 



FIG. 783. Pityostrobus (Pinites) macrocephalus. (After Gardner; nat. size.) 



FIG. 784. Pityostrobus (Pinites) macrocephalus. A, section of an ovule; n, nucellus. 

 B, longitudinal section of j>art of the cone. (From sections in the British 

 Museum; B, slightly reduced.) 



prothallus tent-pole of Ginkgo ovules: at its blunt apex are two 

 winged pollen-grains. Prothallus-tissue is also represented. 



Carruthers compared the species with Pinus Pinaster but the 



