46 AKT. !-• X. YEXDO. 



au invalid form and a number of intermediate forms between 

 both extremes may be met with. 



Branchlets are axillary. They are for the most j)art stunted and 

 are beset with several ramuli in a spiral arrangement. The result 

 is the presence of subfasciculate bunches at the axils. The ramuli 

 are always an in Hated fusiform however the fulcrant "rami" may 

 vary in their shape. Hence those plants wdiich have the filiform 

 and cylindrical "rami" assume a very widely spread and slender 

 appearance (fig. 2), while those in which the pyriform " rami " 

 predominate, have a dense and robust appearance (fig. 2.). 



Eeceptacles are smooth, cylindrical clavate, round at the apex, 

 and have very short stalks. As a rule, 3-5 or more of them are 

 found forming a cluster on an inconspicuous stem, directly on the 

 axil of a "ramus" or of a ramulus of the fertile branches. 



Remark on the systematic position of the species. Cysto- 

 lihyllum fusifonne was established by Harvey, as above noted, 

 from sterile specimens. So far as I have been able to ascertain no 

 one has ever described its receptacles. In spite of the abundance 

 of the sterile individuals, the receptaculiferous plants are rather 

 rare. The plants attîiin their utmost luxuriance at the end of 

 April and most of them are driven away from the substratum 

 before they produce the reproductive organs. Some of the plants, 

 which have passed a summer, and dropped most of the "rami" 

 from the lower and middle portions of the fronds continue their 

 develojmient late into the autumn ; and those in quiet coves 

 frequently reach (3-8 feet in total height at the end of the 

 following March. The receptacles are found in June and July. 

 They are sometimes met with on individuals a few inches in 

 height which had evidently germinated the previous autumn, or 

 sometimes on the two-year old fronds. 



