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THE SEAWEEDS 
more or less separated, interspersed above with smaller, monosiphonous 
ramelli, at the base thicker, soft, attenuated. Stichidia subcristate at the 
apices, and on the sides of the hairy penicillate ramelli. 
South coast of Australia. 
Dasya velutina J. Agardh. 
Frond 6 cm. to 10 cm. long, or more, about \ mm. thick, cartilaginous, 
scarcely attenuated, alternately branched, the branches simple, or furnished 
with a second or third series of lesser branches. The older parts of the 
frond naked, but all the young branches densely covered with minute equal 
ramelli, resembling a pile of velvet. These are less than 1 mm. in length, 
very patent, many times dichotomous, with very patent forkings, their 
apices acute. Colour full red. 
South Australia (Eastern Bays). 
HETEROSIPIIONIA Montagne. 
Fronds mostly erect, of dorsiventral construction, caulis usually com- 
planate, structure cellular or filamentous-cellular. Branching primarily 
sympodial, crescentic, apices erect or incurved, each articulus two, rarely 
three to eight biseriate, proliferous from margin of secondary branches. 
Pericentral cells four to six or more, soon externally corticated. Cysto- 
carps ovoid or urceolate, lateral on the branches, sessile or pedicellate. 
Antheridia occupying a similar position to the tetrasporangia, mostly 
elongate, on polysiphonous pedicels. Stichidia on young ramuli, construc- 
tion almost radial, elongate, terete, borne on polysiphonous pedicels 
(rarely monosiphonous), tetrasporangia four to six verticillate. 
H eterosiphonia micro cladioides (J. Ag.) Falkenberg. 
= Dasya pellucida Harvey. 
Frond tufted, about 3 cm. high, but slightly branched ; the branches 
alternate, undivided and very erect, closely beset with short multifid 
dichotomous branchlets. Articulations visible in all parts of the frond, 
very short. Colour carmine. 
West Australia (King George Sound), Victoria (Port Phillip). 
II eterosiphonia callithamnion (Sond.) Falkenberg. 
= Polysiphonia callithamnion Sonder. 
A minute plant, 5 mm. to 15 mm. in length, with a subsimple (possibly 
becoming branched) pellucidly jointed stem, densely clothed with very 
patent, quadrifarious, imbricated, dichotomous ramuli. Tubes four, large, 
surrounding a rather wide central cavity. 
West Australia. 
H eterosiphonia Gunniana (Harv.) Falkenberg. 
= Dasya Gunniana Harvey = Dasya lawrenciana Harvey. 
Frond 30 cm. or more long, from 1 mm. to 2 mm. in diameter below, 
attenuated upwards, flexuous, repeatedly and at length excessively 
branched, opaque and inarticulate below, more or less distinctly jointed 
above. Branches alternate, patent, long, flexuous, the larger ones bipinnate, 
