ALGÆ ANTARCTIC, 275 
ramuli tender and adhering to paper. This species comes 
very near C. Arbuscula and C. Brodiei, between which it 
almost seems intermediate. It has the large size and robust 
habit of the former, but much longer and more compound 
plumules ; and it is much stouter than C. Brodiæi, with more 
opaque stems. Var. jj. is perhaps only an advanced state of 
the plant, being gathered in the same locality and three months 
later in the season. It chiefly differs in being of a more ten- 
der gelatinous substance, and in having the branches less 
densely clothed with ramuli, and most of them naked at the 
base. Its outward character is something that of C. tetra- 
gonum. We cannot be sure whether this be Agardh’s 
C. Gaudichaudii, having seen no specimens of his plant, and 
his description being too brief to enable us perfectly to deter- 
mine the matter; but no other plant among our Falkland 
Island collection so nearly coincides with his words. He had 
probably only a single specimen to describe from, and we 
havea large suite of all sizes and ages. 
59. Callithamnion gracile, nobis, in Fl. Antarct. v. 1, p. 191. 
Has. Campbell’s Island. 
60. Callithamnion hirtum, nobis, in Fl. Antarct. v. 1, p. 192. 
Has. Lord Auckland's group. 
61. Callithamnion micropterum, nobis, in Fi, Antarct. v. 1, 
p. 192. 
Har. Lord Auckland's group. 
62. Ectocarpus geminatus, nobis; cespite basi intricato 
olivaceo v. virescente, filis (majusculis) tenuibus ramosis- 
simis apice liberis plumosis, ramis ramulisque patentibus 
Oppositis v. quaternis, ultimis brevibus, utriculis conicis 
sessilibus oppositis basi sæpius ramulo brevi bracteæformi 
fulcratis. 
Has. Cape Horn and the Falkland Islands. 
A beautiful species, 4-5 inches long, having the habit of 
E. granulosus, but amply distinguished by the constantly 
Opposite, sessile, conical eapsules or utriculi, which are very 
Senerally subtended by a minute ramulus half their own 
length. The main branches are frequently in fours; the 
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