PROC. WASH. ACAD. Set. VOL. 



PLATE XII. 





4 



: ^' : cT :: $8& v ~^-' 



\t O O _'S ^0 







124 



M. C. F., DEL. 



FERGUSON, -PINUS. 



MACROSPOROGENESIS. 



126 



HELIOTYPE CO., BOSTON. 



