Studies of Teratological Phenomena. 



79 



.9. Pisuin umhellaium. 

 Tufted or Scottish Pease. 



grown under optimum conditions. All the plants thus produced were 

 in every case fully fasciated, almost, if not quite as much as the original 

 grandparent.' The slight variabilit}- of the character was therefore 

 ascribed by Lock to environmental influences. Fi plants grown at the 

 Bussey Institution from seed ("Irish 

 Mummy" X "Chinese Native") fur- 

 nished by Darbishire, gave ab- 

 solute dominance of the normal 

 condition. 



2. Zea Mays L. De Vries, 

 East and Hayes, Emerson and 

 Hus have all experimented with 

 races of maize which produce fas- 

 ciated ears. 



De Vries (1894) finds this cha- 

 racter to belong to the "eversporting" 

 class. Cultures that were grown by 

 him contained 40 per cent abnormal 

 plants. Hus and Murdock (1911) 

 secured results similar to those ob- 

 tained by de Vries. 



East and Hayes (1911) found 

 an ear of this fasciated type in a 

 culture of field corn which had been 

 selfed for three generations. The 

 seed was grown and 34 abnormal 

 and 12 normal- eared plants were 

 produced. Another fasciated ear 

 appeared in the F2 generation of a 



cross between two normal strains, one of which had been recorded 

 as throwing abnormal- eared plants. This ear produced 62 abnormals: 

 23 normals. The normals appeared to breed true, and the abnormal 

 condition is regarded by them to be dominant. The character itself 

 fluctuated between very abnormal and (superficially) almost normal 

 states. 



The most extensive investigations on the inheritance of fasciation 

 in maize have been made by Emerson (1912). In his cultures, the 

 degree of fasciation varies much even betw^een the different ears of a 

 single plant, some ears being very broad-tipped, while others are only 



Fig. 8. Pisiwi sativum umhellaium. 

 (After Gerarde.) 



