ALGZ ANTARCTICA, 267 
Frond an inch high, solitary, rigid, as thick as a hog’s bristle, 
simple at base, and rising with a stipes, distichously branched 
above in a flabellate manner ; the outline circular. Branches 
multifid, irregularly dichotomous, fastigiate, ramuli erect. 
Joints of the stem very long, 6-8 times their diameter, of 
the branches 2-3 times, and of the ramuli one and half as 
long as broad, all marked with numerous narrow strie. 
Colour dingy brown, scarcely rufescent. It imperfectly 
adheres"to paper. Of this very distinct species we have seen 
but a single specimen. 
41. Polysiphonia Davisii, nobis; punicea, caule articulato 
basi ultrasetaceo sensim attenuato frondem percurrente 
subindiviso per totam longitudinem ramis alternis de- 
compositis ornato, ramis erecto-patentibus sub-bipinna- 
tim divisis, ramulis ultimis brevissimis crebre alternis 
erectis furcatis vel rard bifurcatis axillis angustis, articulis 
omnibus brevissimis, ramorum diametro equantibus, ra- 
mulorum brevioribus, e tubulis octo (duobus lateralibus 
majoribus) tubum centralem amplum cingentibus formatis. 
Has. Cape Horn. 
This is a handsome plant, though perhaps too closely related 
to P. punicea, Mont. which was found abundantly at Ker- 
guelen's Land, the Falklands, and Cape Horn. Our present 
plant has a different aspect, from having a more regular pri- 
mary ramification, with more erect, denser and less divided 
ramuli. As far as we are able to judge by ‘an imperfect spe- 
cimen, Heterosiphonia Berkeleyi, Mont. is also a nearly allied 
form; and if the genus Heterosiphonia is to be retained, the 
present plant, with P. panicea, and probably some others, 
should be referred to it. 
42. Polysiphonia (Heterosiphonia) pectinata, nobis; seta- 
cea rigida, fronde purpurea distichè decomposito-pin- 
nata, ramis alternis articulatis tri-striatis pectinato- 
pinnatis, ramulis (vel pinnulis) simplicibus alternis bre- 
vibus subulatis monosiphoniis (!) re ete 
diametro sesquilongioribus. | 
Has. Cape Horn, very rare. mU | 
- Frond 2-3 inches long, setaceous, rigid, listic evi branch- 
