Alga of Tasmania. 
55 
George lown, V.D.L., R. Gunn, Esq., n. 1316 in part.— 
Fronds 6-8 inches high, excessively branched aud bushy, but not 
of so shrub-like a character as P. frutex, much divided from near 
the base into long erect branches or stems, which are generally 
simple, or merely throw out from their lower part long branches 
similar to themselves. These branches are in circumscription 
linear or narrow lanceolate, fasciculato-bipinnate throughout their 
length, the pinnse very short, in proportion to the length of the 
branch, or j to £ inch long on branches that are 4-5 inches long, 
erect or erecto-patent, pinnulated with short simple spine-like 
ramuli, the apices beset with byssoid fibres. Articulations of the 
stem and branches 4 striate, from 2 to 4 times longer than broad. 
Colour a dull brownish or grey.—This species, which may be 
looked on as the A<. D. Land representative of P. nigrescens, is 
nearly allied to P. frutex, but differs something in habit, and 
clearly in the length of the joints. The structure of the stem is 
similar in both. 
14. Polysiphonia cancellata, Harv.; frondibus ultrasetaceis, fru- 
ticulosis, spinoso-ramosissimis, articulatis, sulcatis; ramis e 
jtasi emissis, longissimis, fiexuosis, divaricatis v. horizontali- 
bus, ramulis alternis, distantibus, patentissimis vix pinnulatis 
v. margine subuliferis; articulis diametro duplo brevioribus, 
reticulatis, 4 striatis; keramidiis minutis, ovatis, sessilibus. 
George Town, V. D. L., R. Gunn, Esq., n. 1318 and 1320. 
—Fronds 4-5 inches high, thicker than bristle at the base, forming 
a thorny bush, the outline of which is broadly ovate or globose; 
branches as long as the principal stem, and issuing at right angles 
with it, flexuous, from a quarter to half an inch asunder, furnished 
with a second series of horizontally patent ramuli each about an 
inch long. These ramuli are either furnished with a series of dis¬ 
tant, short, spinelike pinnules, or they are more or less bipinnate, 
the pinntB in this latter case resembling the main ramuli in the 
former; the ultimate pinnules always patent and spinelike. Arti¬ 
culations deeply furrowed, much shorter than broad, 4 striate; 
the strim which mark the tubes as evident as those which divide 
the branch into joints, and thus the frond has a netted appear- 
