

Fie. 481. Left, branch of Pinus insularis bearing male cones (x 1); right, 
longitudinal section through a male cone (x 5) 
YY 
A 
ay 


Left, section of microspore of pine ; note the inflated wings which make the spore 
buoyant (x 3890). Right, male prothallus within the wall of the microspore of 
pine: above are two disorganizing prothallial cells; below these is the genera- 
tive cell; and below and almost surrounding this is the large tube cell (x 530) 
