210 Trans. Acad. Sci. of St. Louis. 



pound grains there are numerous simple round grains of 

 larger size (PI. XIX. 10). 



Dactylis glomerata, L. The epidermal part of the cary op- 

 sis consists of rather thin-walled somewhat elongated cells 

 followed by a layer of thick- walled elongated cells. These 

 cells do not differ essentially from those of the testa. The 

 cells of the testa are smaller and similar. The remnants 

 of the nucellus are colorless and more or less mucilaginous. 

 The aleurone layer consists of a single row of cells, usually a 

 little longer than wide. The starch grains relatively large 

 and apparently simple, oval or round. Harz states that they 

 are slightly attached together (PI. XVII. 11). 



Poa pratensis, L. Harz, in addition to his account of the 

 anatomical structure of Poa nemoralis, gives the anatomy of 

 common blue-grass, but only with reference to the structure 

 of the starch grains. The account of the endosperm, the 

 caryopsis and testa of Poa sudelica is more complete. In 

 Poa pratensis the pericarp and testa are both but slightly 

 developed. The epidermal cells of the caryopsis are elon- 

 gated, rather thick-walled. According to Harz the outer part 

 of the caryopsis is followed by several thin-walled underlying 

 parenchyma layers. The testa consists of two rows of tabular 

 cells with considerably thicker walls than the epidermis. The 

 nucellus is very much compressed, and not evident except 

 upon treatment with chloral hydrate. The aleurone layer 

 consists of one row of cells, or occasionally doubled; the cells 

 are longer than broad. The cells of the starch layer are 

 much larger than the aleurone cells, the vitreous starch grains 

 compound and simple. The individual elements are some- 

 what angular or polygonal (PI. XVII. 10). 



Festuca Shortii, Wood. Several species of the genus 

 Festuca were studied by Harz. The microscopic structure of 

 Festuca shows that it is very closely allied to Bromus. The 

 adhering palet as shown in cross section consists of thick- 

 walled epidermal cells followed by two or three rows of 

 thinner-walled parenchyma cells. The cells of the outer row 

 of the caryopsis are thin-walled and iu cross section mostly a 

 little longer than broad. This is followed by several rows of 

 somewhat similar cells, also thin-walled. The nucellus is very 



