ROCKWORK FOR FERNS 57 



fronds in midsummer. This species repro- 

 duces itself in two ways: by spores and by 

 bulblets located on the under side of the 

 fronds; the latter start to grow so quickly 

 after they fall that the species may become a 

 nuisance, crowding out others equally desir- 

 able. The aftermath, however, is a compen- 

 sation, for a second fragile mantle of green 

 covers the trail of Jack Frost with fresh 

 promise of the coming spring. 



The hairy-lip fern {Cheilanthes lanosa), 

 an attractive little Southerner which super- 

 ficially resembles the rusty woodsia (W. 

 Ilvensis), is one of the very best ferns for 

 the lawn rockery. Growing naturally on the 

 crest of rocks, it accepts trying situations 

 with a betteir grace than many transplanted 

 Northern species. In my own experience it 

 is perfectly hardy, looking remarkably fresh 

 after the severest Vermont winter on record. 

 A light covering, however, is to be recom- 

 mended for exposed situations. 



No rockery is complete without the hart's 

 tongue (Phyllitis Scolopendrium), the long. 



