296 
THE SEAWEEDS 
opposite each other. Stichidia carried on the semi-concave inner margin of 
the frond, 8 mm. to 12 mm. long, whorled, sublanceolate, curled. Colour 
brownish-red. Substance membanaceous, adheres to paper. 
South Australia (Investigator Strait, Eastern Bays),. Western Australia, 
Tasmania. 
AM ANSI A Lamouroux. 
Frond flat, midribbed, pinnatifid or proliferous, transversely striate, 
membranous'; the membrane formed of hexagonal cells, of equal length, 
arranged in obliquely transverse lines or striae, destitute of cortical 
cellules. Cystocarps ovate or globose, containing a tuft of pear-shaped 
spores. Stichidia simple or branched, marginal or superficial, containing 
tetraspores in a double row. 
Amansia Kiitzingioides Harvey. 
Frond much branched. Stem cartilaginous, 1 mm. to 2 mm. thick, opaque, 
destitute of bordering membrane. The lower part of the branches is 
similar, but the upper is bordered by a narrow, serrated, membranous 
wing, and .closely set with horizontally patent, distichous or irregularly 
inserted laciniae. These laciniae are delicately membranous, traversed by 
a very slender midrib, obliquely transversely striate, and more or less 
deeply pinnatifid ; the younger ones are simply serrate, the older incised, 
and the fully developed regularly pinnatified; the outline is oblong 
or obovate. The pinnules, or ultimate segments, are about 2 mm. 
broad and sharply serrate, minutely bifid, and quite straight (not involute) 
at the apex. Under the microscope the membrane is shown to be composed 
of hexagonal cells, about four times as long as broad, symmetrical and of 
equal size and separated by pellucid lines. The stichidia are scattered 
on the surface of the lamina, tufted, linear-attenuate, hooked over at the 
point, and contain a double row of tetrasporangia. The colour is brownish- 
red. Substance is rigid and membranous, and the plant does not adhere 
to paper in drying. 
South Australia (Holdfast Bay, Encounter Bay), West Australia. 
Amansia pmnatifida Harvey. 
Frond 15 cm. to 50 cm. long, and as much in the expansion of the 
branches, linear in every part, from 2 mm. to 3 mm. wide, several times 
distichously pinnatifid. Branches alternate or secund, their pinnae and 
pinnules 4 mm. to 6 mm. apart, erecto-patent, narrowed at base, with 
indexed margins and inrolled obtuse apices, traversed by a very slender, 
unicellular, articulated midrib. The membrane is composed of a single 
plate of elongated, hexagonal, longitudinal cellules, arranged in transverse 
zones across the lamina; these zones are alternately different, the cells in 
one zone diminishing in length from the costa to the margin, those in the 
other diminishing from the margin to the .costa. The colour is a deep 
purplish brown-red. The substance is firmly membranous and rigid, but 
thin and in drying does not adhere to paper. 
South Australia (Encounter Bay, Investigator Strait, Eastern Bays), 
West Australia (King George Sound). 
