38 



nounced membraneous ruffle which is easily seen with a hand 

 lens and is usually \4sible to the naked eye. 



The only microscopic characteristic of value in identifica- 



Figure 32 

 Fig. .32. Pepper Grass. 



tion are the mucilage cells, which on the addition of water burst, 

 and the cell contents from a column broadened at the top. (Fig. 

 32.) 



SHEEP SORREL. 



{Rumex acetosella, L.) 



The seed is shaped like that of buckw^heat but is not nearly 

 so large, measuring only 1 — 1.5 m.m. in length. The color of 



Figure 33 

 Fig. 33. Sheep Sorrel. 



the seed is a dull reddish brown. The surface shows rough under 

 the hand lens, being covered with a number of small ridges and 

 projections. The epidermal la^^er is highly characteristic, being 

 made up of irregularly strongly convoluted small cells which give 

 the rough appearance to the seed. The ridges formed by these 

 convolutions are more or less parallel. (Fig. 33.) 



