[ -87aha 
XXI.—MARINE ALGH (CHLOROPHYCEZ AND PHMOPHYCEZ) AND 
MARINE PHANEROGAMS OF THE ‘SEALARK’ EXPEDITION, 
COLLECTED BY J. STANLEY GARDINER, M.A., F.RB.8., F.L.S. 
By A. Gepp, 1.A., F.L.S., and Mrs. E. 8, Grr. 
(Plates 47-49.) 
Xead 18th June, 1908. 
THE following is a list of the Chlorophycese and Pheophycez collected by 
Mr. J. Stanley Gardiner during the ‘Sealark’ Expedition to the Seychelles, Chagos 
Archipelago, and the adjacent islands of the Indian Ocean in 1905. The Rhodophyceee 
and a few Cyanophycee still remain to be worked out. 
The present list numbers 36 species of Chlorophyceze and 18 species of Pheeophycee, 
among which 6 are new to science—namely, Microdictyon pseudohapteron, Struvea 
Gardineri, S. orientalis, Bryopsis indica, Cladocephalus excentricus, and <Avrain- 
villea Gardineri. In addition there are 2 new varieties of Caulerpa described by 
Madame Weber van Bosse and several other species of great interest. Of the novelties, 
Microdictyon pseudohapteron exhibits. in its reticulum a new form of tenacular 
connection which, according to Major Reinbold, whose views on the geuus will soon 
be published, warrants the creation of a special section or subgenus for its reception. 
Bryopsis indica proves to be the same species as Harvey’s unnamed specimens from 
Ceylon, published as no. 99, Alg. exsicc. Ceylon; and it is also represented by other 
specimens from Ceylon and Mauritius in the British Museum and Kew Herbaria. 
Cladocephalus excentricus is an East-Indian species of Mr. M. A. Howe’s new genus, 
which has hitherto been known only from the West Indies, and indeed from only two 
localities there. 
As regards specially interesting species other than novelties, we would mention 
Boodlea van Bossei, of which we are able to add new records for the Indian Ocean 
based on specimens found by us in the Kew Herbarium ; Codiwm difforme, which, though 
it has been collected by the ‘ Siboga’ Expedition in the Malay Archipelago, has not yet 
been actually recorded from the Indian Ocean; Zydemania eapeditionis, which has only 
been found once previously, viz., in the Malay Archipelago by Madame Weber van Bosse 
during the same expedition; Udotea glaucescens, now recorded for the first time from 
the Indian Ocean, its home being in the Pacific ; U. palmetta, which has never, so far 
as we know, been collected since the original gathering, and the only specimens of 
which are preserved in the herbaria of Paris and Caen, but without record of original 
locality—indeed, till the present specimens were brought home by Mr. Gardiner no 
region even could be assigned as habitat of the true species, though we had reasons for 
SECOND SERIES.—ZOOLOGY, VOL. x11. [ 163 | 51 
[Reprinted from Trans. Linn. Soc., ser. 2, Bot. vol. vii. (1908) pp. 163-188, pls. 22-24. ] 
