—— 
MRS. WEBER VAN BOSSE ON PSEUDOCODIUM. 209 
On a new genus of Sipsoncan Algee—Pseudocodium. By 
Mrs. Weser van Boss. (Communicated by GxorGE 
Morray, F.L.S.) 
(Plate I.) 
[Read 6th June, 1895. ] 
On the rocks near Isipinga, and at the foot of the well-known 
bluff near Durban, I collected in the month of November, 1894, 
an alga, which proved to be new to science, and to belong toa 
new genus of the family of Codiacew, Wille. Unfortunately 1 
found it only in a sterile state, but its anatomical characters 
are very marked, and distinguish it well from all the other 
members of this family. It may be described as follows :— 
PsEULOCODIUM, gen. nov. 
Frondes virides dichotomi, rami cylindrici omnino consimiles 
ex filis tubulosis subparallelis, longitudinaliter dispositi, apice 
iternm atque iterum divisi contesti, articuli exterioses apice in 
vesiculos oblongos evoluti corticem pseudoparenchymaticam 
formantes, rhizini filiformes cum granulis sabulosis et inter se 
dense intertextis. Progatio ignota. 
Species unica. P. Dg-VRIEsEI. 
Hab. Rupicola, ad littora Natalie, Africe australis. 
It resembles in its outward appearance a Codium (Plate I. 
fig. 1), above all when ‘taken freshly out of the water. Size, 
colour, habit, recall that genus; but on looking more attentively 
the observer will be struck by the fact that the vesicles or clavate 
ramuli, as Harvey called the peripheral branches of Codium, 
adhere closely together and so firmly that it is impossible 
to detach them from each other without injuring the plant 
(fig.2). The peripheral ramuli of Codiwm, on the contrary, 
are, as everybody knows, entirely free from the base to the top. 
The likeness to Codium, however, is so great, that I still 
thought my alga might belong to this genus, and might 
perhaps constitute an extreme member of it. Sections made 
through the frond convinced me of my erroneous opinion and 
indicated clearly that Pseudocodium is, in fact, much nearer 
related to Halimeda than to Codium, notwithstanding that the 
calcareous incrustation and the wedge-shaped joints, both 
LINN. JOURN.—BOTANY, VOL. XXXII. P 
