MICROSCOPIC STRUCTURE OF WEED SEEDS 



509 



Fig. 386. Green Foxtail. Outer epidermis from the middle of the glume of the 

 fertile flower. I, outer surface, and II, inner surface soon after blooming. 

 Ill, outer surface when in fruit. X 300. 



(After "Wlnton, Conn. Agr. Exp. Sta.) 



clasp about the caryopsis are longer, narrower, and less complex 

 than those already described. At maturity the wrinkles are usually 

 from 0.03 to 0.06 nun. apart. 2. The Eypodermal Fibers may be 

 readily isolated by treatment on the slide with caustic alkali. They 

 vary in length up to 0.6 mm. and are often toothed at margin. 

 3. Mesophyl. Rectangular parenchyma cells without intercellular 

 spaces make up this layer. Numerous chlorophyl granules are 

 present at the time of flowering. 4. The Inner Epidermis is com- 



