12 | R. A. EMERSON 
Seedlings and young plants of type IIIa show no more color than do 
those of type IVa, and apparently do not develop color in darkness. As 
the plants approach the flowering stage, they usually show somewhat 
more color than do plants of type IVa, particularly at the base of the culm 
and in the brace roots, and sometimes in the leaf sheaths. The staminate 
inflorescence is usually, tho not always, somewhat more highly colored 
than that of type [Va. The anthers are deep purple, like those of type 
Ta (Plate II, 1). With red aleurone the anthers are usually reddish purple, 
and with cherry pericarp they are dark purple, sometimes appearing 
nearly black (Plate Ii, 2 and 3). The anther color develops fully in dark- 
ness, but the glumes are slightly if at all colored when protected from light 
by black paper bags (Plate VIII, 3). As the plants mature, considerable 
color develops in the inner husks (Plate VII, 3), on the leaf sheaths, and 
particularly in the culm even where it is protected from strong light by 
the sheaths. In some cases the culm and the sheaths ultimately become 
nearly as strongly pigmented as type Ia, but ordinarily the mature plant 
is considerably less highly colored than the purple type (Plate VII, 4). 
The color seen in mature plants develops well in local darkness, in which 
respect also type IIIa is like Ia. Dilute purple differs from purple, there- 
fore, mainly in a less intense pigmentation and in a delayed development 
of pigment. The pericarp of type IIla is either red, cherry, or colorless, 
and the aleurone is either purple, red, or colorless, Just as in type Ia. 
There exists a type of plant color which is closely related genetically 
to type IIIa, but which lacks red or purple color in culm, sheaths, silks, 
glumes, and anthers and is consequently known as Green, type IIlg 
(Plate II, 4). The aleurone of this type is either purple, red, or colorless, 
and the pericarp is either red or colorless, never cherry. With respect 
to aleurone and pericarp, therefore, type I1Ig is like type Ig. 
DILUTE SUN RED, TYPE IV 
Dilute sun red is the commonest color type of maize in cultivation. It is 
practically the only color type seen in the dent varieties grown in the Corn 
Belt of the United States, and is common in flint, flour, sweet, and pop 
corns. Like the sun red and the dilute purple types, it always appears 
in crosses of purple Ia with green VIc. 
The seedlings of type IVa usually show more or less sun red pigment 
in the coleoptile, the leaf sheath, and the leaf margins. The young 
