OF SOUTH AUSTRALIA. 
369 
Ceramium isogomim Harvey. 
Attachment a small disc. Frond 2 cm. to 5cm. high, distantly dicho- 
tomous, fastigiate, flabelliform, with strongly hooked apices. Articulations 
of nearly equal length and breadth in all parts of the frond, equally coated 
with coloured granules, except on a narrow medial, pellucid line. Cysto- 
carps ovoid, in pairs near the ends of the branchlets, each pair subtended 
by two or three short ramuli. Tetrasporangia very prominent, globose, 
whorled round the articulations at or near the medial pellucid line. Colour 
deep purple-red. 
West Australia (Garden Island), Victoria (Port Fairy), Tasmania. 
Ceramium nodiferum J. Agardh. 
Frond setaceous below, dichotomous, attenuated above ; ramuli lateral, 
subfasciculate, erect; ramelli very soft, terminal ones erect; lower articula- 
tions twice as long as wide ; interstices pellucid, the penultimate ramuli and 
the lateral ramelli bearing tetraspores, attenuated, lanceolate ; tetraspores 
verticil late within the articulations causing a swel l ing, immersed in the 
cortex, translucent. 
Victoria (Port Phillip), New Zealand. 
Ceramium nobile J. Agardh. 
Frond 15 cm. to 24 cm. long, setaceous, broad, dichotomous, shorter 
branches irregularly alternate; fertile ramelli conspicuously transformed 
almost into stichidia, secund and sublanceolate ; articulations of the 
stichidia moniliformly torulose. Tetrasporangia numerous, verticillate, 
immersed, finally issuing vertically from the articulations. Sterile upper 
articulations as long as wide, lower ones almost twice as long as wide. 
Colour purplish-red when wet. 
South Australia (Encounter Bay, Eastern Bays), Tasmania. 
Ceramium gracillimum Griff, and Harvey. 
Frond 2 cm. to 15 cm. long, densely caespitose, very slender and flaccid, 
dichotomous, the ramelli somewhat dissimilar, lateral, fastigiate, forcipate ; 
lower articulations longer than wide. Tetrasporangia subverticillate, their 
upper parts emerging glabrous, surrounded below by cortical cells. Cysto- 
carps subterminal at the apices of the ramelli ; the ramelli of the involucre 
elongate, forcipate, many patent and umbellate. Colour violet-purple. 
Adheres to paper. 
South Australia (Eas'ern Bays), Tasmania, Europe, West Indies. 
Ceramium excellens J. Agardh. 
Frond setaceous, elongate, dichotomous, the shorter ramelli rising from 
the nodes, the upper ones secund on the outer side of the ramuli ; the lower 
ones opposite, or often verticillate; the lower articulations up to three 
times as long as wide, contracted at the nodes; interstices pellucid, narrow 
at the transverse line, lateral ramelli bearing tetraspores, sublanceolate, 
torulose. Tetrasporangia verticillate, immersed within the articulations, 
causing a swelling. 
Victoria (Port Phillip), Tasmania. 
