520 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
TAXODIUM DISTICHUM (Bap Cypress) 
Retinodiplosis taxodii Felt, the cypress seed midge, has been 
reared from the cones of bald cypress. The larvae deform the seed. 
producing irregularly globose, thick-walled, somewhat spongy, modi- 
fied seeds in cones about 5 to 7 mm. in diameter. Jtonida anthici Felt 
produces the cypress 
flowering gall, a whitish 
flower - shaped fungoid 
oallleeliiats occasionally 
abundant and _ re adily 
recognized. The species 
is interesting, since it 
simulates a fungus so 
closely that at one time 
it was believed to be one. 
Figure 140.—Gall on bald cypress caused by Lhecodiplosis TIES 
Thecodiplosis sp. (Riley) makes the cy- 
press twig gall, a fusi- 
form gall 1 to 25 cm. long (fig. 140). Ztonzda taxodii (Felt) makes 
the cypress leaf gall, a conical, globular or elongate deformation of 
the leaf. 
TILIA (LINDEN) 
Ttonida citrina (O.S.), the linden twig gall midge, causes irregular 
swellings 4 to 8 mm. in diameter on the terminal bud of linden. The 
species has sometimes been abundant enough to seriously stunt the 
growth of the trees. The species, which is unknown in the adult stage, 
may prove to be the same as the European species Contarinia tiliarum 
Kieff. Ztonida verrucicola O. S., the linden wart gall (fig. 141), 
Figure 141.—Galls on linden leaf caused by Itonida verrucicola, 
