ON THE SYNONYMY OF SOME ACANTHACEOUS PLANTS. 389 
Lyngbya, but I do not know any species of that genus that has fila- 
ments at all like this, nor has such a development ever been observed ; 
and I cannot believe that Actinothrix could ever develope into a stra- 
tified or tufted Lyngbya. 
On communicating the description of this plant to Professor Harvey, 
he referred me to a freshwater Alga figured in ‘ English Botany.’ I 
suppose he intended Conferva echinulata, plate 1378, which Agardh 
thinks is allied to Vorticella versatilis, of Müller's * Vermes,’ t. 39, ff. 
13 and 17. The young state of Actinothrix differs from Sowerby’s 
figure in having only a comparatively few short conical rays, not much 
longer than the diameter of the central mass, and in having the endo- 
chrome as in Oscillatoriacee. : 
British Museum, Nov. 15, 1864. 
ON THE SYNONYMY OF SOME ACANTHACEOUS 
PLANTS. 
Eranthemum Cooperi, Hook., lately figured in the Bot. Magazine, 
as a new speces from New Caledonia, was discovered in August, 1794, 
by George Forster, in Tanna, New Hebrides, and described by him in 
his ‘ Prodromus,’ under n. 13, as Justicia longifolia. His authentic spe- 
cimens, together with a coloured drawing made on the spot, are pre- 
served at the British Museum, placing the identity of Hranthemum 
Cooperi and Justicia longifolia beyond'a doubt. lt is the Justicia sinuata, 
Banks et Sol. in Vabl, Symb. iii. p. 11; Enum. i. p. 166 ; Eranthemum 
sinuatum, Roem. et Schult, Syst. i. p. 175, and the duthacanthus si- 
nuatus, Nees ab Esenb. in De Cand. Prodr. xi. p. 462. I have seen 
specimens from Tanna (G. Forster !, W. Anderson!) and Aneitum 
(M'Gillivray !, Milne !). 
Tn rectifying the synonymy of this Acanthaceous plant, I must point 
out a mistake of which I have been guilty, in naming (' Bonplandia,’ 
vii. p. 246) a new genus of Acanthaceæ from Brazil, of which the fruit 
is unknown, Spathodea ilicifolia. Whilst leaving Dr. Anderson to deal 
with this singular plant in his forthcoming revision of the whole Order, 
I will only add that it is identical, as I have since found, with Digitalis 
dracocephaloides, Vellozi, Fl. Fluminensis, vi. t. 101. 
BERTHOLD SEEMANN, 
