LINDSTROM, GENETICAL RESEARCH WITH MAIZE 341 
fully normal. The F, segregation of such a crosse is not distinct. Greens 
and the two types of striping occur but counts are difficult if not impo- 
sible. 
Fine-striped. — In this type the green leaves are striped or streaked 
with fine lines of white (or yellow if the Il factor is present). The stri- 
ping occurs particularly along the leaf margin. When crossed with any 
of the other types the hybrid plants are green. Segregation occurs in F, 
into greens and the parental types of striping (Lindstrom 1918). 
Lineate. — This type as described by Collins (1920) is somewhat si- 
milar to the fine-striped pattern, although the white stripes appear to 
be much narrower. The type (li) is recessive to green. 
Zebra striping. — As described by Demerec (1921) this type has trans- 
verse stripes made up of numerous yellowish dots on the leaves which 
become more pronounced as the plant matures. Although somewhat 
variable, zebra striping (25) is considered as a recessive Mendelian cha- 
racter. 
Fine streaked. — Although resembling fine-striped in appearance 
this type (fi) is genetically different and is classed as another recessive 
chlorophyll defect (Anderson 1922). 
Other chlorophyll defects that consist of blotching (bl), and spotting 
or dotting (dt) of the leaves are known to be recessive characters al- 
though their genetic behavior has not yet been reported. In addition 
there are probably ten or more chlorophyll defects (white sheath, various 
odd stripings, etc.) whose inheritance is not yet fully solved. 
Anthocyanic or Plant Color Characters 
The inheritance of a complex series of genetic factors controlling the 
cell sap or anthocyanic pigments in the stalk, leaves, husks, and tassels 
of maize has been fully reported by Emerson (1921a). The fundamental 
factor pairs concerned are three: — 
Aa- presence and absence of a basic anthocyan pigment. 
Bb- < 5 „ „ brown flavone À 
PI pl g 5 3% „ „ purple anthocynin 
that develops in the dark as well as in the light in contrast with 
A which forms pigment only in the light. 
In addition to thesebasic factors there are two sets of modifying factors. 
One belongs to the multiple allelomorphic series of the Rr factor pair for 
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