268 ALGH ANTARCTIC. 
ed, decompound in a repeatedly pinnate manner, with much 
of the habit of Bonnemaisonia asparagoides. Stem subsimple, 
jointed, tristriate, compressed or angular, beset through- 
out with alternate patent branches; which are in like man- 
ner furnished with a second series. All the branches are 
regularly pectinated, with alternate patent subulate single- 
tubed (!) short ramuli. The joints throughout the whole 
frond are short. Those of the stem are formed,of four 
unequal tubes, the two lateral ones largest, surrounding a 
central cavity, exactly as in Heterosiphonia, Mont.; those of 
the ramuli have the structure of the joints of Callithamnion. 
The colour is a beautiful purplish rose-red. 
43. Polysiphonia botryocarpa, nobis in Flor. Antarct. v. 1. p. 
181 to 70. 
Has. Lord Auckland's group. 
44. Polysiphonia Lyallii, nobis in Flor. Antarct. v. 1, p. 182 
to 74, f. 1. 
Has. Lord Auckland’s group. 
45. Polysiphonia dumosa, nobis in Flor. Antarct. v. 1, p. 182 
10 75, £. 1; 
Has. Campbell’s Island. 
46. Polysiphonia rudis, nobis in Flor. Antarct. v. 1, p. 183 to 
14, F. 9. 
Has. Lord Auckland's group. 
47. Polysiphonia ceratoclada, Mont. 
Var. 8. secundata, nobis in Flor. Antarct. v. 1, p. 183. 
Has. Lord Auckland's group. 
*Bostrycuia, Mont. 
(Stictosiphonia, Harv. MSS.) 
Frons purpurea, filiformis, cylindrica, ramosa, tubulosa, extus 
stictis quadratis notata, intus diaphragmatibus septata. 
Peripheria e cellulis coloratis quadratis tubum centralem 
* M. Montagne, in proposing this genus, assigns to it the following 
character : : 
“ Frons violacea, continua, filiformis, cylindracea, distichè vinnatim 
vel vag? ramosa intus filis elongatis coloratis farcta, ramellis u! 
articulis secunde versis convolutis. Fructus: 19, stichidia silique- 
