OF SOUTH AUSTRALIA. 
93 
Dilophus fastigiatus (Sond.) J. Agardh. 
Frond stupose at the scutate base, broadly linear with distant dicho- 
tomies, segments erect, spreading, not wrinkled, apices obtuse. Spores 
solitary, scattered. To 15 cm. high. 
Western Australia, South Australia, Victoria. 
LOBOSPTRA Areschoug. 
Frond erect with a branching holdfast, cartilaginous, compressed, 
spirally twisted, alternately pinnate, linear, the ultimate segments bicuspid. 
Spores scattered over the faces of the segments, round, each contained in 
a hyaline perispore. The one species. 
Lobospira bicuspidata Areschoug. 
To 45 cm. high. Wiry, spirally much twisted. Colour greenish-olive, 
becoming verdigris green on exposure to air or fresh water. 
Western and South Australia and Victoria. 
Order PHAEOZOOSPORINAE. 
Multicellular plants of a most variable form and structure including 
many diverse Families. Propagation by vegetative division of the cells, 
by fragments of the thallus, by peculiar propagula, or by active cells 
(phaeozoospores) . 
Generation by zygotes resulting from the copulation of phaeozoogonidia, 
or by the fecundation of an immobile oosphere by a smaller male 
phaeozoogamete. 
Family LAMINARIACEAE. 
(Australian.) Large plants with a stout stem and broad lamina. The 
growing point, which is not situated in the apex of the lamina, consists 
of an intercalary meristem situated at the junction of blade and stem, 
which accordingly increase in opposite directions. The structure is 
elaborate; the epidermal layer consists of slightly elongate cells containing 
chromatophores and forms the assimilative tissue, as well as the meristem 
for secondary growth ; within this, forming the greater part of the lamina 
and much of the stem, is a parenchymatous layer of thin- walled cells; 
bordering this internally there occurs in the stalk another layer of elongate 
cells with pitted walls, recalling the wood cells of trees, and the inner wall 
of this develops sieve-tubes ; in the central axis of the stem there is a dense 
plexus of branching anastomosing fibres, which probably acts as a 
conducting tissue (Murray). 
