280 GENETICS IN RELATION TO AGRICULTURE 
also had considerable more red pigment in the epidermis. This was 
especially marked in the marginal region of the sepals (see Fig. 118) 
and on the developing fruits. This form was named rubrinervis and 
since it bred true when self-fertilized it was considered a well-defined 
“progressive” species, 7.€., a species capable of maintaining itself in the 
Fia. 116 —G. lamarckiana, lata and nanella. (From colored plate in de Vries’ Mutations- 
theorte, vol. 2.) 
wild state. In the fourth generation four additional forms were found. 
One of these, gigas, appeared only once in de Vries’ cultures but the 
one plant found in 1895 produced nearly 300 plants of gigas type from 
self-fertilized seed and the strain bred true thereafter. In recent years 
it has appeared a number of times in other strains of lamarckiana. 
This form is decidedly more robust than lamarckiana and the leaves are 
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