198 



THE AMERICAN MIDLAND NATURALIST 



and Potent ill a paradoxa. The walls of the large cracks in the more 

 clayey areas were frequently covered with a green lining of Vanch- 

 eria and various diatoms. A species of Riccia, a flat, circular, well- 

 rooted plant, was usually the first to grow on the newly exposed 

 land. 



Table i. Showing the plants found growing on the alluvial bank, 

 their abundance, their location and the kind of propagule. 



