278 
THE SEAWEEDS 
Pollexfenia pedicellate/, Harvey. 
Frond 10 cm. to 12 cm. long, and equally broad, delicately membranous, 
with an orbicular outline, more or less deeply divided in a mixed dichoto- 
mous and pinnate manner ; the segments spreading simple or pinnatifid, the 
spaces between them wide and rounded ; the apices obtuse, and the margin 
entire. The substance is very thin, areolated, and destitute of costa, but the 
frond is transversed throughout with a wide band of pellucid veinlets, or 
inernal filaments, which have the appearance, under a pocket lens, of deli- 
cate striae. These veinlets originate at the base of the frond, and radiate 
towards all the segments, passing through the centre of each, and evidently 
supply the place of a midrib, without taking its appearance. They are most 
obvious towards the apices, which is not usually the case with costae or 
nerves. Colour rosy-purple, becoming brownish-red in drying. Cystocarps 
Fig. 124 . — Pollexfenia pedicillata. Fig. 125 . — Pollexfenia lobata. 
abundantly scattered over both surfaces, ovate, acuminate, born on stalks 
as long as themselves. Stichidia also thickly dispersed, tufted, ovate- 
lanceolate. 
South Australia (Holdfast Bay, Encounter Bay, Eastern Bays), 
Western Australia, Tasmania. 
Pollexfenia lobata (H. & H.) Falkenberg. 
= Jeannerettia lobata Hooker fi-L and Harvey. 
Attachment or hold-fast small, discoid. Fronds tufted 25 cm. to 50 cm. 
long, and as much in the expansion of the segments, rising with a filiform, 
slender stem, which at 2 cm. to 8 cm. above the hold-fast passes into the 
base of the frond, and is continued upwards as a midrib. This midrib sends 
off lateral branches, one of which traverses each lobe of the frond until it 
is lost near the apex ; and the larger branches throw out other laterals, 
directed towards the smaller lobes. The frond is delicately membranous, 
but of firm and somewhat rigid substance, and is subdichotomously divided ; 
the lesser segments alternately inciso-pinnatifid, or lobulate. The margin 
is everywhere undulated, and the lobes very obtuse. In old specimens the 
midrib is proliferous, emitting similar fronds. Under a pocket lens the 
