ALGA OF TASMANIA. 443 
Joseph Hooker at Kerguelen's Land, I should perhaps have 
fallen into the error of considering these two species identi- 
cal. B. elegans is, however, a much more delicately and 
finely branched plant; its substance is far more tender, the 
ciliz that border its branches are slenderer, and its capsules 
are removed from the apex of the ramuli. M. Montagne 
informs me that Greville's Calocladia pulchra belongs to the 
Lamourouxian genus Delisia, and he considers it distinct 
from D. fimbriata, Lam. 
17. Laurencia? membranacea, Harv.; fronde plana, tenui- 
membranacea (!), lato-lineari, profunde bipinnatifida ; 
pinnis pinnulisque alternis patentibus, inferioribus brevi- 
bus dentiformibus, superioribus linearibus elongatis ; ax- 
illis rotundatis ; pinnulis obtuse dentatis ; apicibus obtusis. 
George Town, V. D. L., R. Gunn, Esq., n. 1277.—Having 
seen but a solitary barren specimen of this remarkable plant, 
Í am unable to give more than a very imperfect description 
of it, and cannot altogether satisfy myself of the proper 
genus to which it should be referred. It has so much the 
colour and outline of very luxuriant specimens of Laurencia 
pinnatifida, that I venture to place it in the same genus, 
although its substance is as thin and membranous as the 
frond of Rhodomenia bifida, or of Thamnophora Mertensii. 
Had the apices been acute, and the colour less purple, I 
should probably have placed it in Zhamnophora. The fruit, 
When discovered, will decide the question. Mr. Gunn's 
Specimen, which is broken at base, and may be only a 
branch, measures 8 inches in length, and, taking the expan- 
sion of its branches, 7 inches across; the breadth of the 
frond being half an inch in the widest, and more than a 
quarter in the narrowest place. "There is neither midrib nor 
thickening in the middle, the whole is a thin membrane. 
stem is undivided ; its lower half furnished with short, 
= Closely set, alternate, bluntly toothed pinne about half an 
Meh long; its upper half bears long pinne 3 inches long, 
which are again pinnatifid, the pinnules bluntly toothed, and 
the teeth themselves bluntly cleft at the apex. All the apices 
2K 2 
