AUSTRALIAN AND TASMANIAN ALG. Ix 
CXCV. GDOGONIUM, Link. 
781. monile, Berk. and Harv. (Fl. Tasm. ii. t. 196.) 
Has. Tasmania, in fresh water, 2. Gunn / 
782. gracile, Kiitz. (Kiitz. Sp. Alg. 366. Sond. Linn. xxv. p. 657.) 
Has. Tasmania, Séwart. (Kurope.) 
783. stagnale, Kii/z. (Kiitz. l.c. 368. Sond. 1. c. 658.) 
Has. Tasmania, Stuart, (Kurope.) 
784. capillare, Kiitz. (Kiitz.1.c. Sond. 1. c.) 
Has. Tasmania, Stuart. (Hurope.) 
CXCVI. CONFERVA, fries. 
785. floccosa, Kiitz. (Sp. Alg. p. 871. Sond. l.c. 658.) 
Hag. Kensington, Victoria, Dr. Mueller. (Cosmopolitan.) 
Family XXV. ZYGNEMACE.®. 
Freshwater, confervoid Alge, the Australian species of which have yet to be 
ascertained, and cannot be determined satisfactorily from dried specimens. I 
have received species belonging to the genera Zygnema and Spirogyra. Sonder 
(Linn. xxv. p. 658) enumerates five species, sent by Dr. Mueller. 
Family XXVI. DESMIDE. 
Freshwater Algze. Australian species not explored. 
Family XXVIL. OSCILLARIACH A. 
CXCVII. RIVULARIA, Roth. 
786. australis, Harv. ; fronde maxima (1-12 uncias diametro) solitaria hemi- 
spheerica solida lubrica olivaceo-viridi. rans. R. L. Acad. xxi. p. 566. 
Has. Cape Riche, on rocks near low water. 
787. plicata, Carm. (Harv. Phyc. Brit. t. 315.) 
Has. King George’s Sound. (Shores of Britain.) 
188. nitida, 47. (Harv. Phyc. Brit. t. 68.) 
Has. Rivoli Bay. Dr. Mueller /, 1848. Brighton, Port Philip, Dr. 
Mueller, W. H. H. Georgetown, Tasmania. (Europe. Loochoo Is- 
lands.) 
CXCVIII. LYNGBYA, Agardh. 
789. ferruginea, 4y. (Harv. Phyc. Brit. t. 311.) 
Has. Tasmania. Port Fairy, Harv. Aly. Exsiec. n. 594. (Kurope and 
America, in brackish water and the sea.) 
790. anguina, Mont. (Sond. in Pl. Preiss. ii. p. 152.) 
Has. Western Australia, Preiss. 
CXCIX. CALOTHRIX, Agardh. 
791. cxspitula, Harv. ? (Harv. Phye. Brit. t. 305 ?) 
Has. Cape Riche. (Shores of Europe ?) 
792. limbata, Harv.; cxspitosa, letevirens, filis elongatis mollibus flexnosis 
latiuscule pellucido-marginatis hic illic cohrentibus, striis creberrimis. 
Harv. Aly. Exesicc. Austr. ¢. 596. 
Hap. Rottnest Island, Western Australia. 
