PLATE 36 
A. —Normal blossoms from healthy plants of Nicotiana viscosum. 
B. —Depauperate blossoms from mosaic plants affected with the mosaic disease 
peculiar to N. viscosum. This disease is distinct from the ordinary form of the mosaic 
disease affecting varieties of N. tabacum and does not affect them. 
C. D.—Blossoms showing catacorolla, etc,, as a result of the mosaic disease affecting 
Nicotiana viscosum. These are from first-generation plants of the cross Connecticut 
Broadleaf tobacco $ XN. viscosum S . This hybrid appears to be immune from the 
ordinary mosaic disease affecting the female parent, but is susceptible to the mosaic 
disease affecting the male parent, N. viscosum. Although this mosaic disease has never 
produced instances of catacorolla in N. viscosum , all phases of catacorolla are produced 
in the hybrid. Catacorolla is a common malformation in varieties of N. tabacum as a 
result of the ordinary form of the mosaic disease. 
