AUSTRALIAN AND TASMANIAN ALG. xIx 
206. debilis, ZZarv. ; fronde parvula (1-2-unciali) purpurea vage dichotoma v. 
flexuoso-ramosa, ramis alternis patentibus filiformibus apice clavatis, ramulis 
paucis sparsis claveeformibus, tetrasporis in apicibus ramulorum nidulantibus 
magnis. 
Has. On Zostera ; King George’s Sound, W. H. H. (cum priore). 
Sect. 2. Fusrrormes : ramulis basi et apice acutis. 
207. fusifolia, Hook. f. and Harv. (Fl. Tasm. ii. p. 298.) 
Has. Tasmania, Dr. Hooker, Mr. M‘Gowan. 
208. tenuissima, 4g.? (Fl. Tasm. ii. p. 297.) 
Has. Georgetown, Tasmania, R. Guan. 
209, lanceolata, Harv. (PLatTe CCXXXIX.) 
Haz. On Zostera, Rottnest Island, Western Australia, VW. H. H. 
210. bulbosa, Harv. (Fl. Tasm. ii. p. 297.) 
Has. Tasmania. 
911. (2) rubra, Harv. (PLate CCLXXX.) 
Has. Western Australia, G. Clifton. 
Sect. 3. VERTICILLATE : ramis articulato-constrictis, ramulis verticillatis. 
212. Opuntioides, Harv. (FI. Tasm. i. t. 189.) 
Has. West and south coasts of Australia, common. Tasmania. 
213. verticillata, Harv. (Pxarr CII.) 
Han. Western Australia. Port Fairy, Victoria. Georgetown, Tas- 
mania. 
914. Umbellula, Harv. (Puate CXLVIL.) 
Has. Western Australia. 
LXXII. BOSTRYCHIA, Montagne. 
9215, rivularis, Harv. (Piate CLXXVI. B.) 
Has. In the river Moy, Port Fairy, Victoria. (South Carolina, North 
America.) 
216. mixta, Hook. f. and Harv. (Puate CLXXVI. 4.) 
Has. Port Arthur, Tasmania. (Akaroa, New Zealand. Cape of Good 
Hope.) 
917. Harveyi, Mont. (Puate CCXCII.) 
Has. Tasmania, C. Stuart. Sealer’s Cove, Dr. Mueller. Yarra, Dr. 
Mueller! Chiloe. New Zealand. (B. australasica, Sond.! Linn. xxvi. 
p. 527.) 
LXXIII. POLYSIPHONIA, Greville. 
Subgenus 1. OL1cosipHoNniA. Siphones primaru 4, rarissime }. 
Sect. 1. Eroncats. Caulis corticatus (inarticulatus). Ramuli articulati. 
218, Hookeri, Harv. (Ner. Austr. p. 40. t. 12.) 
Hag. Port Philip. Tasmania, abundant. 
219. Mallardiz, Harv. (Ner. Austr. p. 40. t. 13.) 
Haz. Western Australia. South coast, from Port Fairy to Western 
Port. Tasmania. 
220. Hystrix, Harv. (Ner. Austr. p. 41. t. 14.) 
Haz. West and south coasts of Australia. Tasmania. 
