192 
THE SEAWEEDS 
Hypnea seticulosa J. Agardh. 
Frond intricate-bushy, branches not much projecting from the bunch, 
through their whole length bearing spinules, each with a broader base nar- 
rowed above into a sharp bristle. Height about 15 cm., below about 2 mm. 
thick. Substance sub-corneous (the whole plant rather like a sponge V 
Colour dull-red. 
The South Coast of Australia, Tasmania, J apan. Collected in South Aus- 
tralia from Encounter Bay, Investigator Strait, Eastern Bays. 
Hypnea hamulosa (Turn.) Montagne. 
Apparently very like H. seticulosa, but smaller, 5 cm. to 8 cm. tall and 
with more marked spines. 
Cape of Good Hope, Red Sea, South Australia (Investigator Strait). 
GLOIODERMA J. Agardh. 
= Horea Harvey. 
Frond elastic gelatinous, composed of three strata of cells, the central 
of rounded-oblong cells loosely conjoined, the intermediate of smaller cells 
or anastomosing threads, the cortical of vertical moniliform threads included 
in mucus. Cystocarps on papillae, with an angulate-horned pericarp. 
Tetrasporangia immersed in the cortical stratum, scattered, cruciately 
divided. 
The genus is confined to Australia, Tasmania ; three of the five species are 
already known from South Australia. 
A. — Cystocarps scattered over face and along margins of the frond. 
Gloioderma australis J. Agardh. 
To 15 cm. high, 4 mm. to 8 mm. wide. Named Horea polycarpa by 
Harvey from the numerous cystocarps scattered over the frond. 
South Australia (Eastern Bays), Victoria, Tasmania. 
B. — Cystocarps marginal or sub-marginal. 
a. Frond filiform, less compressed, narrow, 2 mm. to 3.5 mm. wide. 
Gloioderma fruiticulosum (Harv.) De Toni. 
Victoria and Tasmania. 
b. Frond compressed, flat, broader. 
Gloioderma Wilsonis (J. Ag.) De Toni. 
Fronds erect, segments straight, almost fastigiate, to 14 mm. 
wide. 
Victoria and Tasmania. 
