GENETIC CONTROL OF CELL INTEGRATION 

 A-mediterranea 



307 



A-crenulata 



Graft hybrid 



FIGURE 11.1. Graft hybrids of Acefabularia. In grafts between rhizoids of the two 

 species, A. mediterranea and A. crenulafa, in which each contributes a nucleus to the 

 hybrid, the morphology of the cap formed after grafting is intermediate, showing an 

 influence from both species. When anucleate segments of the stalk of one species are 

 grafted onto the nucleated rhizoid of the other species, the first cap formed may be 

 intermediate, but subsequently all caps have the morphology of the species which con- 

 tributed the nucleus (adapted from Hammerling, 1953, Intern. Review Cyfol., 2:475). 



