426 Miscellanea. 
multifid one-tubed attenuated coloured filaments. Substance 
seemingly rigid, and only imperfectly adhering to paper. Colour 
a fine crimson. Stichidia lanceolate, terminating the forked ramuli, 
containing tetraspores.—The strong affinity which exists between 
this plant and P. Gunniana induces me to dedicate it to the me¬ 
mory of the late R. W. Lawrence , Esq., the intimate friend ana 
accomplished fellow-labourer in botany of Mr. Gunn. It differs 
from P. Gunniana in the more rigid substance, inarticulate lesser 
branches, and small and very dense fascicles of ramuli. To the 
naked eye it is not very unlike some states of Cerarnium obso- 
letum. —A transverse section of the stem shows a large central 
tube, surrounded by eight or nine others of moderate size, and 
these externally defended by a wide periphery composed of slender 
broken cellules containing endochrome, which cause the opake 
appearance of the stem. In P. Gunniana the structure is very 
similar, except that the periphery is very much narrower, and the 
tubes proportionally larger. 
12. Polysiphonia frutex, Harv.; frondibus aggregatis, fruticu- 
losis, ramosissimis, articulatis, sulcatis; caulibus basi ultra- 
setaceis, sensim attenuatis, et in ramis divaricato-patentibus, 
decompositis, alternis solutis; ramis secundariis bipinnatis, 
pinnis distantibus, patentibus; pinnulis brevibus, simplicibus 
v. ramulosis, apice fibris hyalinis, byssoideis ornatis; articulis 
omnibus brevissimis, diametro equalibus v. brevioribus, 4 stri- 
atis, keramidiis.? 
George Town, V. D. L., R. Gunn f Esq., n. 1317, and one of 
the specimens marked 1316.—Prowls 2-4 inches high, forming 
globose bushy tufts, branching in every direction from the imme¬ 
diate base, the branches equalling the stem in length, or no dis¬ 
tinct stem visible;—all excessively branched, the lesser branches 
alternate, very patent or divaricate, setaceous below, attenuated 
upwards, straight, bitripinnate, with distant alternate pinnse; 
these in their turn having distant, short, spinelike pinnulse, which 
are sometimes again pinnellate;—all the apices terminating in 
colourless byssoid fibres. Colour dull grey or brownish, staining 
the paper reddish. Articulations visible from the base to the 
apex, very short. A transverse section of the stem shows a small 
