154 Trans. Acad. Sci. of St. Louis. 



tain protein grains, pigment, and tannin, and in color contrast 

 decidedly with the Malpighian layer. 



JSIulrient. The cells of this layer are thick-walled, elon- 

 gated, and brown, containing protein grains and tannin. It 

 also contains the vascular elements. 



Mycotic. This layer is of considerable thickness, measur- 

 ing 56 n; the cells are nearly colorless, thick-walled, and elon- 

 gated ; the elongated, tortuous cells are partially separated by 

 numerous small intercellular spaces. 



Nucellus. Although the development has not been studied, 

 I beheve that the layer below the mycotic is the nucellus. 

 The cells are very dark in color — much more so than the usual 

 nutrient layer or nucellus. 



Embryo. The outer row of cells continuous; no inter- 

 cellular spaces; exterior walls thickened; much smaller (14- 

 16X9.8-14//) than the parenchyma below; these measure 

 33.6-56 X 33-19.6 /i. Cells contain fat and protein grains 

 but no starch. 



PSORALEA CUSPIDATA, Pursh. 



Fl. XI.f.2-2b. 



Testa and small layer of endosperm 99.6-23.4 ju in thick- 

 ness, nearly colorless, as in P. tenuiflora. Osteosclerids also 

 agree with those of that species. The nutrient layer with a 

 great deal of pigment. Endosperm sparingly developed. 

 First row of cells of embryo somewhat elongated, with thin 

 lateral walls ; exterior walls thicker. Interior cells of em- 

 bryo thin-walled, with a triangular intercellular space at the 

 angles. — (Kerrville, Texas, Heller, Mo. Bot. Gard.) 



Amorpha, L. 



Schleiden and Vogel called attention to the mucilaginous 

 endosperm of this genus. The species here studied mostly 

 agree as to their Malpighian cells. The endosperm is un- 

 equally developed. 



Amorpha canescens, Nutt. 

 PI. XI. f. 3-3b. 

 Testa and endosperm vary in thickness, 95-232//, mostly 



