No. XIV.—MARINE ALGA, RHODOPHYCEZ. 
By Mrs. A. WEBER-VAN Bossz, Pu.D. 
(Plates 16-18 and 1 text-figure.) 
(CoMMUNICATED BY PROFESSOR STANLEY J. GarpinER, M.A., F.R.S., F.L.S.) 
Read 5th June, 1913. 
[Reprinted from Trans. Linn. Soc., Ser. 2. Botany, Vol. viii. pp. 105-142, pls. 12-14. ] 
I. Introduction. 
THE algze treated of in the following paper were collected by Mr. J. Stanley Gardiner 
during the Perey Sladen Trust Expedition to the Indian Ocean in 1905. It was at first 
intended that Mrs. A. Gepp should work out the collection, but she handed it over 
to me, and illness prevented her joining in the work, which we would only have been too 
glad to carry out together. She had, however, sorted the material before sending it 
to me. 
The collection does not contain all the Rhodophycee collected by Mr. Stanley Gardiner ; 
the Lithothamnia have been worked out by the much lamented Mr. Foslie. The literature 
on the algze of this part of the Indian Ocean is scarce, for besides the paper by Mr. Foslie 
and the Report on the Chlorophyceze and Pheophyceee of the ‘‘Sealark”’ Expedition by 
A. Gepp, M.A., F.L.S., and Mrs. E. Gepp, I only know of one paper in which more than 
a few algze of this region are mentioned. Mr. Reinbold, in “ Meeresalgen der Deutschen 
Tiefsee-Expedition,” mentions 26 species of Rhodophycez from Diego Garcia and Mahé, 
10 of which have been also collected by Mr. Stanley Gardiner. Besides this paper of 
Mr. Reinbold, I have found two other short references to algee from Diego Garcia 
and the Seychelles. Mr. W. B. Hemsley adds a note on Alge to his “ Report on the 
Vegetation of Diego Garcia.” Of the alge named only Dasya indica, J. Ag., has any 
interest for us at present; it is the only red alga mentioned. A note by “J. B.” in 
“ Knowledge” treats only of Myxophycese, and may therefore be passed over in silence. 
The “Sealark ’”? collection had special interest for me because I am just publishing, 
with the aid of Mr. Reinbold, the first part of a list of alge collected during the 
“ Siboga” Expedition in the Malay Archipelago. This part contains the Myxophycee, 
Chlorophyceze, and the Phzeophyceze; the second part, containing the Rhodophyce, 
will, I hope, follow soon. The study of a region so near to the Malay Archipelago 
afforded me great interest from a phyto-geographical standpoint. It had, however, 
one drawback ; some species found by me in the “Siboga” collecticn and recognized as 
new are also found in the Stanley Gardiner collection, and the fact that the paper on 
the algze of the Indian Ocean will appear before the ‘“Siboga” paper, will diminish 
the number of novelties in the latter. But this could not be avoided, and I have 
described the new species as fully as I could; only in one case, when the barren, 
small fragment could not possibly have been recognized apart from the fertile 
specimens of the ‘‘Siboga” Expedition, have I referred to the forthcoming paper. 
SECOND SERIES—ZOOLOGY, VOL. XVI. 35 
