HELOTIACEAE 



263 



Lambertella. Ovulinia produces conidia singly on simple co- 

 nidiophores, but otherwise it closely resembles Sclerotinia [Weiss 

 (1940)]. Ovulinia azaleae causes flower spot in destructive pro- 

 portions on cultivated azaleas and rhododendron. Rutstroemia, 



Fig. 106. Sclerotifiia gladioli. A. Multinucleate cells from vertical section 

 of ascogonial coil that has not been spermatized. B. Ascogonial cells, 3 

 days after spermatization, showing paired nuclei and initiation of asco- 

 genous hyphae. C. Ascogonial cells, 4 days after spermatization. D. Asco- 

 gonial hyphae, 6 days after spermatization. E, F, and G. Stages in conju- 

 gate division in ascogenous hyphae. H. Conjugate nuclei ready for fusion. 

 /. Fusion of nuclei in young ascus. /. First division of fusion nucleus. 



(Courtesy of F. L. Drayton.) 



