J 24 MAIZE 



CHAP. (g) Shape: flat; spheroidal; conical. 



IV. (h) Shape (side view); straight cuneate ; rounded cuneate; curved cuneate ; 



truncate cuneate ; shoepeg ; rectangular ; round cornered. 

 (i) Apex : roof-shaped ; shingled ; rostrate ; mucronate ; rounded ; flat ; 



dented. 

 (/) Indentation: round dimple; long dimple; creased; pinched; rough; 



bridged ; wrinkled. 

 (k) Colour : white ; cream ; yellow ; golden ; red ; blue ; purple ; black ; 



striped; mottled; mosaic. 

 (1) Place of colour : endosperm; aleurone layer ; hull. 

 (m) Character of endosperm : corneous ; partly corneous ; farinaceous ; 



sugary. 

 (n) Proportion of corneous endosperm (in dent variety) : large ; medium ; 



small. 

 (o) Embryo size: large; medium; small. 

 (/>) Sketch of longitudinal cross-section : show arrangement to scale, of 



embryo, and of corneous and white endosperm. 



95. Tubular Glands in the Embryo. — Dr. C. Stuart Gager 

 (l) describes the occurrence of true glands of the tubular and 

 sub-racemose type in the tissue of the scutellum, formed by 

 invaginations of the glandular epithelium of the latter. The 

 significance of these glands, as in harmony with the theory 

 that the scutellar epithelium is principally an organ of secre- 

 tion, is indicated by the author. 



96. Apogamy. — Collins (4) has described a case in which 

 the staminate flowers were replaced by young leafy and root- 

 forming maize plants. 



Addendum. — Since this chapter went to press the writer 

 has seen a paper by Prof. Emerson (1) of Nebraska, in which 

 he describes and illustrates a family of maize in which the 

 ligule and auricle were absent. He refers to a similar con- 

 dition in oats reported by Nilsson-Ehle (1) and Hurst (1). 

 Prof. Emerson notes that in the case of non-auriculate leaves, 

 the sheath and the lower part of the blade are rolled some- 

 what closely about the stalk, and that the leaf as a whole 

 assumes an upright position nearly parallel with the stalk, 

 the tip of the leaf curving away gently if the blade is long 

 and the mid-rib sufficiently flexible. " Whether the abs- 

 ence of the ligule proper is disadvantageous to the plant 

 is somewhat questionable. . . . My own observations on 

 liguleless corn are to the effect that the inside of the sheath 

 is more often discoloured, as if from incipient decay, than is 

 the case when a well-developed ligule is present. In no case, 

 however, have I found decay of the stalk or leaf sufficient to 



