106 MES. A. WEBEE-VAN BOSSE ON THE 



Amongst the algae of the Indian Ocean I found species of two new genera, Tapeino- 

 dasya and. Oligocladus^ described for the first time from the Malay Archipelago in * Les 

 Annates du Jardin botaniq^ue de Buitenzorg,' vol. ix. 1910. It afforded me great pleasure 

 to describe these species, which confirm the validity of my new genera. One genus, 

 Tseudendosiplionia, is new in the present collection ; it is most closely allied to Endo- 

 siphop.ia, and yet is so different that it can be easily distinguished ; one species, Dasya 

 indlca^ had to be described as a new genus — Amfliishetema. 



Many of the algse are barren, and can therefore not be specifically named ; others are 

 only fragments. I have given the generic names of all, because I think that, for our 

 knowledge of the geographical distribution, even a generic name may have some value. 

 The collection is rich in novelties ; I often hesitated before describing a given al 

 new, but when, after careful investigation, I could not identify it with any existing 

 diagnosis, I felt I had no alternative. Of the novelties, which include one genus, 

 17 species, one variety and one form, 11 are from deep water, 2 from reef and deep 

 water, 7 from reef alone. It may be weU to recall here that Mr. and Mrs. Gepp 

 found Avrainmllea amadelpha in material from reef and deep water. Many algse appear 

 to accommodate themselves to both modes of living. The ' Sealark ' Expedition had, 

 like the * Siboga ' Expedition, the advantage of the use of a dredge, and several hauls 

 from deep water, where many E-liodophycese flourish, have given a rich harvest. The 



the bottom surroundino: the reefs and islands, whence these algae come, has 



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o 



been treated in detail in the above-mentioned paper by Mr. Eoslie. I think it therefore 

 unnecessary to do this again. 



The geographical distribution shows that a great resemblance exists between the 

 algological flora of the Indian Ocean and that of the Malay Archipelago as well as that 

 of the east coast of Africa. Of the 26 species found at Mahe and Diego Garcia by the 

 *' Deutsche Tiefsee-Expedition," 7 occur also at Dar-es -Salaam, and of the 8 other 

 species collected at Dar-es-Salaam by that expedition 5 are found in the Stanley 

 Gardiner collection *. But it is a puzzle to know how Cladhymenia oblongifolia and 

 Calliblepharis prolifera, only known hitherto from New Zealand, and Chondria pusilla, 

 only known from the West Indies, came to be inhabitants of the present region. It 

 emphasizes the fact that the geographical distribution of algse is a factor that should 

 always be very carefully considered. The finding of Feyssotinelia Harveyana, known 

 only from the Atlantic Ocean at Brest, puzzled me less, because it may be possible that 



the determination of the barren plant 



I have therefore queried 



I have given a list of the localities with the algae found at each, and a general list of 

 all the Rhodophycese collected by Mr. Stanley Gardiner. The systematic observations 

 on the different genera and species conclude the paper. 



I wish here to express my sincere thanks to Mr. Stanley Gardiner for entrusting me 

 with his collection, and to Messrs, Gepp and Cotton for the kind help they have given 



me; and I may perhaps add a word of deep-felt regret that Mrs. Gepp was unable to do 

 her share of the work. 



• The number of species commoi to both regions is probably far greater, for in the recently published paper by 



Br. Schroder, " Zellpflanzen von Ost-Afrika," Eedwigia, Bd. lii., four more species are mentioned, also found in the 

 present collection. 



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