OF SOUTH AUSTRALIA. 
363 
Spyridia biannulata J. Ag. 
= Spyridia filament osa Harvey pars. 
Frond filiform, spreading in all directions, ramuli regular above; outer 
ramelli articulate, articulations distinct, alternately long and short, the 
longer ones corticate, polysiphonous ; shorter ones form a node (or nob) ; the 
secondary ramelli sparsely hirsute, with the cortical cells at the nodes 
arranged in an almost single row; the apices acuminate and simple, the 
articulations of the ramuli shorter than wide, of the ramelli a little longer. 
South Australia (Investigator Strait, Eastern Bays), Tasmania. 
Spyridia breviarticulata J. Agardh. 
Fronds filiform, vaguely branching on all sides, branches developing an 
irregular cortex, upper part of the ramuli and smaller ones externally 
articulate ; articulations distinct, shortly corticated, polysiphonous and 
nodes almost equally long ; ramelli pile-like, sparse, at the nodes the cellular 
cortex forming a" conspicuous slight band; terminal simply acuminate; 
articulations of branches shorter than their diameter, of the ramelli longer. 
South Australia (Encounter Bay, Investigator Strait, Eastern Bays), 
Friendly Islands. 
Spyridia opposita Harvey. 
Attachment a callous disc, frond 20 cm. to 35 cm. long, obtusely 
angular, subdistichous, the ramuli widely spreading, then straight; the 
ramelli corticate to the apices, slightly irregular, the pinnae long, robust, 
attenuated, opposite, patent, incurved, converging towards the apices, 
corticate at the nodes with a wide band of cortical cells, acuminate and 
simple at the apices. Colour red, substance rigid, adheres imperfectly to 
paper. 
South Australia (Gulf St. Vincent, Encounter Bay, Eastern Bays), West 
Australia, Tasmania. 
I 
Fig. 182 . — Spyridia opposita. 
Fig. 183 . — Ceramium nobile. 
