THE MARSH BUCKLER FERN 
343 
a substratum of stone, and placing upon this the necessary 
bed of peat and leaf-mould ; so that the water may be 
retained, and the rhizomas of the Fern kept immersed in 
the buggy soil, with their crowns just above the surface. In 
pot-culture, a flat pot, or pan, should be selected for Lastrea 
thelypteri s, and similar conditions of growth extemporized. 
