316 MISC. PUBLICATION 42 4, U. S. DEPT. OF AGRICULTURE 



Figube 81. — Aster olecanium vitreum: A, outline, X 60; B, section of margin, X 

 650 ; C, 8-shaped pore ; D, antenna ; E, genital and anal area, X 230 ; F, tubular 

 duct ; G, multilocular pore. A. vulgare: H, section of margin, X 900; /, outline, 

 X 60 ; J, genital and anal area, X 460 ; E, antenna ; L, dorsal 8-shaped pore ; 

 M, marginal 8-shaped pore; N, tubular duct; O, disk pore; P, multilocular 

 pore ; Q, quinquelocular pore ; R, submarginal 8-shaped pore ; S, minute dorsal 

 8-shaped pore; T, dark-rimmed 8-shaped pore. 



