—7i— 



nature of the plant which carries the young tips outward 

 from the centre. The centre is left vacant by the dying 

 of the older plants. The rings enlarge gradually year 

 by year. The habit is not confined to Lyco podium sabi- 

 ncefoliiun alone, but is also noticeable in Lycopodium 

 inundatum. 



Farmington, Maine. 



RARE FORMS OF FERNS— IV 



A Bipinnatifid Christmas Fern. 

 It is probable that if one searched long enough he 

 could find bipinnate forms of any of our pinnate ferns, 



and corresponding forms for those that are naturally 

 more than pinnate. The numerous sports of Nephrolepis 

 exaltata now coming on the market well illustrate the 



