PLATE 2 
A. —Photograph of immature seed of Hypochaeris radicata, showing nemas 
coiled inside the seed; taken by transmitted light. 
B. —Apical end of a mature seed, showing nematodes within the seed. 
C. —Small seedling of Hypochaeris radicata showing typical Tylenchus swelling 
in the midrib of the first permanent leaf. This is one of several such plants 
that resulted from planting seed from a mature infested flower head into a flat 
of sterilized soil in the greenhouse. 
D. —Three typical seed of Hypochaeris radicata , taken from an infested flower 
head. About half the seed from this same lot contained living nematodes. 
