POLYPODIUMS 83 



There are many of the sub-genera, such as Pleopeltis 

 phymatodes, and others, with spreading rhizomes, are 

 particularly suited for planting on the rock-fernery. 



Most of those with the spreading rhizomes succeed 

 best where there is plenty of moisture and like good 

 drainage ; sphagnum moss, leaf-mould, with a little 

 loam, should be used for planting or potting them 

 in. Many will do well without any extra warmth 

 during the summer, but if the temperature falls low 

 during the winter the fronds will lose the bright healthy 

 colour, or may go quite discoloured. They are most 

 liable to suffer if they have been kept very warm and 

 then suddenly exposed to cold. Liquid manure may be 

 used freely for all the strong-growing sorts, but the 

 artificial fertilisers should be avoided, as they are liable 

 to burn the rhizomes. 



