SOIL FORMA TIOX : MOORS. 



395 



in more level areas. Old plant parts, and plant remains, by 

 decay add to the bulk, fertility, and changing texture and phy- 

 sical condition of the soil. 





Fig 480- 

 Where isoetes grows. A small morainic basin near Ithaca. (Photograph by the author.) 



711. The bald cypress (Taxodium distichum). — Very char- 

 acteristic are the formations presented by the forests of the bald 

 cypress of the South, which grows in swampy or marshy places. 

 The " knees " on the roots of this cypress make grotesque figures 

 in the cypress forest. These take the form of upright, columnar 

 outgrowths, broader at the base or point of attachment to the 



