composed of spore-threads issuing from a central placenta ; the spores are 

 ovoid, and of large size. The walls of the frond are much thicker and more 

 densely cellular than in R. coccinea -. the central filaments are more or less 

 copious according to the age of the part examined. The colour is a dull red, 

 becoming browner in drying. The substance is very firm and rigid, and only 

 the younger portions of the frond adhere to paper in drying. 



I am indebted to Mrs. Barker (through our mutual friend 

 Dr. Ferd. Mueller) for a fine fruiting specimen of this rare plant, 

 of which I only collected two or three specimens during my Aus- 

 tralian tour. It is by much the most robust and rigid of the 

 genus Hhahdonia, and also the most tree-like. The different spe- 

 cimens vary in extent of ramification, but all agree in the thick 

 stem and densely crowded ramuli. The colour is by no means 

 so bright as in U. coccinea, whose substance and habit also are 

 quite different. 



I have to thank Mrs. Barker for an interesting parcel of Algae, 

 well selected and carefully prepared, — and am happy to be able 

 (as now) to figure the best plant it contained. 



While this sheet is passing through the press I have received 

 a specimen from Western Australia, from my indefatigable cor- 

 respondent, G, Clifton. 



Fig. 1. Ehabdonia dendroides, — the natural size. 2. A ramulus, with im- 

 mersed cystocarps. 3. Section through a cystocarp. 4. Spore-threads. 5. 

 A cross section of the frond. 6. A longitudinal section : — variously ma^wi- 

 fied. 



