delicate, and the frond closely adheres to paper in dryinfi^. The colour is 

 a rosy red, well ])reserved in the herbarium. The surface of the fi'ond is 

 very generally scabrous with minute, bristle-like points ; in some specimens 

 these are very abundant ; in others few, and occasionally, but rarely, the 

 frond is nearlv smooth. 



The habit of this plant is so completely that of an Erythro- 

 clonimi (particularly of E. cmgiistatum) that I had formerly 

 placed it without hesitation in that genus, nor did I discover my 

 error until, having made a cross cutting for the present Plate, I 

 found that the axile filament which characterizes Erythroclomum 

 was not present. The internal structure indeed is similar to that 

 of the most typical Rhabdonia ; and the constricted ramuli are 

 not quite anomalous in the genus, something similar being found 

 in B. gloUfera (Tab. CXXIX.). No fruit has yet been observed ; 

 and hence, perhaps, the genus may even yet be considered as 

 doubtful. When I collected it, about Christmas, 1854, it was 

 tolerably abundant among the drift-weeds within the Heads of 

 Port Phillip, a locality where many other interesting Algae may 

 be found at the same season. 



Fig. 1. EilABDONlA CHAROIDES, — the natural size. 2. Part of a branch, with 

 whorled ramuli. 3. Cirrhous ramuli. 4. Cross section of the frond, more 

 or less magnified. 



