duller on drying, and on exposure the frond fades to a chalky-white. The 
substance is rigid and fragile, and the frond does not adhere to paper in 
drying. 
The genus Chetlosporum has been separated by Areschoug 
from Amphiroa, to which it is nearly allied, and from which it 
differs merely by the position of the conceptacles. In Amphiroa 
the conceptacles, one or many, are developed from all parts of 
the surface of the articulations ; in Cheilosporum there are never 
more than /wo on any articulus, and these are placed, one at 
each side, on the edge of the projecting upper angle of the 
articulus. 
C. sagittatum is a native of the Mauritius and of South Africa. 
The Australian specimens agree very nearly with specimens re- 
ceived from Algoa Bay. As they are not in fruit, I have, at 
figs. 3 and 4, represented magnified fragments of a fertile speci- 
men of the South African plant. 
C. elegans, of New Zealand, is very closely, perhaps too 
closely, allied to the present, but is a slenderer plant. 
Fig. 1. CHEILOsporUM sacirratuM,—the natural size. 2. Apex of a branch, 
with ramuli. 38. Fertile articulations, with ceramidia. 4. A fertile lobe, 
with its ceramidium, after the lime has been removed by acid :—magnified. 
