ALGÆ ANTARCTIC. 253 
Primary leaf in the Kerguelen’s Land specimens nine 
inches, in those from the Falklands 4-5 inches long, from 
an inch to an inch in width, rising from a cylindrical petiole 
or stem, oblong, round-topped, furnished with a strong mid- 
rib, and penninerved with opposite veins, having the sub- 
stance of the frond thickened along the sharply serrated, 
but not sinuated margin. This primary leaf emits from 
the apices of the lateral nerves other leaves in all respects 
similar to itself, and all of them distinctly petiolate, and by 
no means rising (as in D. sínwosa) from sinuations of the 
margin, and these in their turn send out others which are at 
first obovate, and afterwards linear-oblong. The margin in all 
is sharply serrated rather than ciliate. In some very old 
Specimens the membrane of the old leaf has perished, and 
there remains but a slightly winged midrib from which new 
leaves sprout proliferously in an irregular manner. Colour 
rather a dark blood red, inclining to purplish. This is so 
like D. sinuosa, that on a hasty inspection it might pass 
for the ciliated variety of that species. The colour and sub- 
Stance are very similar; but the margin of our plant is not 
sinuous, but proliferous, the new leaves not proceeding from 
deepened laciniations as they do in all the specimens of that 
Species we possess, but being, from their origin, stalked and 
leaf-like. The margin of the frond also is sensibly thickened, 
the old leaf remains of its original form until it decays, and 
the situation of the fruit is different in the two species. 
13. Nitophyllum /ividum, nobis; fronde e stipite cartilagi- 
neo filiformi brevi late expansa basi vix venosa livido- 
Purpurea tenerrima furcata v. dichotoma margine undu- 
lato, laciniis oblongis patentibus obtusis, soris minutissi- 
mis punctiformibus coccidiisque perplurimis per totam 
frondem sparsis. 
Has. Falkland Islands. 
Stem cartilaginous, filiform, half an inch to an inch long, 
Vanishing in a few faint nerves at the base of the widely 
Spreading frond. Frond, save at the extreme base, perfectly 
Veinless and delicately membranous, four inches long, six or 
