Teratological Seedlings. If. 83 
The second group of hemitricotyls, comprising eleven seedlings, con- 
formed to the type of polycotylous seedling to which the name type /3 has 
been given. In these the two bundles of the bifid cotyledon entered the 
hypocotyl quite independently and rotated in the normal way, so that 
© « « 9 1 
.» 3 A A A 
Fig. 1. a-g. Hemitricotylous seedlings showing various stages in the division of the 
abnormal cotyledon. 
Fig. 2. a-c. Hemitricotyl .type a. 
Fig. 3. a-d. Hemitricotyl type / 3 . Diagrams b, c, and d show initiation of triarchy and 
reduction to diarchy by fusion. 
a triarch stage obtained in the upper part of the hypocotyl, this, however, 
being subsequently reduced in all cases to diarchy. In about half the 
seedlings of this type the two bundles supplying the bifid cotyledon entered 
the hypocotyl in close proximity to one another, and immediately after 
rotation the adjacent half-phloem groups fused, this being followed by the 
fusion of the adjacent groups of metaxylem (Fig. 3 ). At a lower level the 
