sequently its genus may be considered uncertain ; but the struc- 

 ture of the membrane, as well as the epiphyllous development, 

 point to that section of the genus Delesseria of which B. hypo- 

 glossum is the type. . B. revoluta is chiefly remarkable for the 

 extreme shortness, in proportion to breadth of the leaflets of 

 which the branches are composed, and for the remarkable recur- 

 vature of the points of all the leaflets above the insertion of each 

 epiphyllum. To a casual examiner the branch looks as if com- 

 posed of successive constrictions merely, not of separate leaflets. 

 It is seemingly an annual species, and not very uncommon, 

 though hitherto only noticed in Western Austraha. 



Fig. 1. Delesseria revoluta, — tJie natural size. 2. Some of the epiphyllous 

 leaflets, forming the extremities of the frond. 3. Apex of a leaflet : — both 

 magnified. 



