292 BOTANICAL GAZETTE [OCTOBER 
PLATE VIII 
. 7.—Vertical section of sporangium of Ginkgo, showing termination 
of le! in transfusion cells and mechanical elements; 50. 
1G. 8.—Transverse section of sporophyll of Ginkgo, showing 2 fibro- 
vascular bundles; Xrso. 
Fic. 9.—Oblique section of sporophyll of Ginkgo, showing on the left 
transition of bundle into mechanical cells; X 200. 
Fic. 1o.—Vertical section of sporangium of Pseudolarix, showing tran- 
sition of bundle into transfusion tissue and mechanical cells; X 200. 
Fic. 11.—Vertical section of sporophyll of Pseudolarix, showing termina- 
tion of transfusion tissue in mechanical elements of the walls of the sporangium; 
X 200. 
G. 12.—Section of sporangium of Pseudolarix, showing wall consisting 
of mechanical cells; X 200. 
PLATE Ix 
Fic. 13. ib eeg eit of Polypodium vulgare as illustration of sporangial 
pase oar in a typical fer 
IG Daeanunatic representation of opening mechanism of sporan- 
gium of ‘ Selasinitle 
IG. 15 2 Seenbslidensneinsaid view of sporangium in Zam 
Fic, 16.—Surface view of sporangium in Zamia showing siabats enlarged. 
1G. 17.—Semi-diagrammatic view of one of the sporangia of Ginkgo, 
showion wiin of fibrovascular tissues to opening mechanism of the spo- 
rangium, 
Fic. 18.—Semi-diagrammatic illustration of organization of the sporan- 
gium in Pseudolarix, showing relation of fibrovascular tissues to opening 
sak erat of sporangium. 
IG. 19.—Transverse section of sporangium of tulip, showing mechanical 
cells. 
Fic. 20.—Transverse section of sporangium of Diervilla, showing sporan- 
gial mechanism. 
