ALGÆ NOVAE ZELANDIÆ. 523 
terised by the muricated stem, a peculiarity which it shares 
with S. linifolium and S. onustum, from both which it is, in 
other respects, very different. 
7. *Sargassum longifolium, Ag. Fucus longifolius, Turn. t. 104. 
Has. New Zealand, Sir Joseph Banks, D'Urville. 
8. tSargassum duplicatum, Bory, in Duperr. p. 127. 
Has. New Zealand, Lesson. 
Is not this a synonym of S. cristefolium, Ag.? a plant of 
which we have excellent specimens from the Mauritius. 
9. Sargassum plumosum, A. Rich. Sert. Astrolab. p. 136. S. 
capillifolium, A. Rich. Fl. Nov. Zel. t. 5. and S. pennigerum, 
A. Rich. 1. c. t. 6. 
Has. Howa. Howa Bay, D'Urville. Bay of Islands, abun- 
dant, Sinclair, Lyall, Hooker, &c. 
Of M. Richard's variety capillifolium, which he at first 
published as a distinct species, we have received but few and 
very imperfect specimens; of his var. pennigerum, on the 
contrary, our series is extensive, and were it not for the high 
authority of the French Naturalist, and the seemingly con- 
vincing data on which he founds his observation, we should 
certainly never have supposed these two varieties to belong 
to one species. Our very numerous specimens of the variety 
pennigerum present no intermediate types of form with the 
var. capillifolium, and only differ one from another in being 
more or less branched. Some, like those described by M. 
Richard, have long simple stems, set with deeply pinnatifid 
leaves ; others, in an older state, are bipinnate, their pinna 
issuing from the axils of the primary leaves, and furnished 
like the stem or main rachis with leaves neither more nor less 
compound than those of the first set. From the axils of 
these secondary leaves spring fruit-bearing ramuli, or, in old 
specimens, a third series of pinnæ similar to the second, and 
law. 
10. Sargassum Raoulii, nobis ; 5 NIS Hee 
so the plant continues to branch after a perfectly uniforme. = 
