ALG.E. — LUCAS. 55 



REPORT ON ALG.^ FROM OYSTER BAY, TASMANIA. 

 PHANEROGAMIA. 



CyMODOCEA ANTARCTICA, Eiull. 



The only Phanerogam included is a rooting fragment of 

 this species, which is common on both sides of Bass Strait, 

 and extends to West Australia. The depth of the water 

 recorded was thirty-five fathoms, which is noteworthy ; as 

 the specimen was a rooting one, it seems probable that the 

 plant was actually growing at this depth. 



ALG^. 

 CHLOROPHYCE.E. 



CoDiuM TOMENTOSUM (Huds.), Stackh. 



The only green alga in the collection is a well-grown plant 

 of this species, which is not in fruit. 



It is of cosmopolitan range, occurring on both east and 

 west coasts of the Atlantic Ocean ; in the Mediterranean Sea ; 

 the Red Sea ; around Mauritius ; and the Philippine Islands. 

 There are other species of very similar appearance, which 

 are common on the south and east coasts of Australia. I 

 have received C. tomentosum, however, from Dunk Island, 

 north-eastern Queensland, and I think that it probably 

 occurs in fair abundance in Australian seas. The species of 

 Codium afford food and shelter to a large number of molluscs 

 and other invertebrate animals. 



FUCOIDE.E— Brown Sea- weeds. 



Sargassum verruculosum (Mert.), Ag. 



Sargassum raoulii, Hook. fil. and Harv. 



One fragment, not bearing fruit. 



This Sargassum is common on both sides of Bass Strait, 

 and extends to New Zealand. 



Sargassum undulatum, J. Ag. (?) 



A small fragment having the wavy folia characteristic of 

 this species, but in the absence of fruit it is impossible to 

 distinguish it from some of its congeners. The floats are 

 mucronate, which is characteristic of the section Arthrophycus 

 to which S. undulatum belongs. 



Port Phillip. Victoria, and Tasmania. 



