Ser. RHoODOSPERME. Fam. Gelidiacec. 
Puatts CCLXVI. 
ACANTHOCOCCUS PUSILLUS, Za. 
Gen. Cuar. Frond filiform or compressed, cartilaginous, vaguely much 
branched, composed of three strata; the medullary stratum of longi- 
tudinal, interwoven, and anastomosing filaments; the ¢xtermediate of 
large, roundish, empty cells, smaller outwards ; the corézcal, of minute, 
coloured, vertically seriated cellules. Fructification : 1, half-immersed 
conceptacles, containing, within a thick-walled pericarp, minute, pedi- 
cellate, oblong spores, attached to many slender, interlaced, parietal 
and internal placente ; 2, ¢e¢raspores zonate, scattered —AcaNTHO- 
coccus (Hook. fil. et Harv.), from axavOos, a thorn, and coxrxos, fruit. 
Frons filiformis v. compressa, cartilaginea, vage ramosissima, striatis tribus con- 
texta; strato medullari filis longitudinalibus interteatis anastomosantibus, in- 
termedio cellulis magnis rotundatis vacuis extus sensim minoribus, corticali 
cellulis minutis coloratis verticaliter seriatis composito. Fruct.: 1, eystocarpia 
semi-immersa, intra pericarpium crassum sporas minutas pedicellatas oblongas 
e placentulis plurimis tenuibus anastomostantibus parietalibus et internis egre- 
dientes foventia ; 2, tetraspore zonatim divise sparse. 
AcanrHococcus pusillus ; frond (about an inch long), irregularly forked 
or multifid, terete ; branches subsimple, subulate, acute ; conceptacles 
just below the straight or slightly falcate tips of the branches. 
A. pusillus ; fronde unciali subdichotoma v. vayge multifida tereti, ramis simpli- 
ciusculis subulatis acutis, cystocarpiis infra apices strictos v. vix falcatos ra- 
MOrUM semi-UNMEeF SIS. 
Acantuococcus pusillus, Harv. olim in Herb. T.C.D. 
DicraNneEMA pusillum, Harv. Alg. Austr. Exsic. n. 313. Harv. in Trans. R. 
I, Acad. v. 22. p. 550. 
Has. On the stems of Cymodocea antarctica. South Australia, Dr. Curdie. 
Dredged near Hmu Point, King George’s Sound, W. H. H. 
Geoar. Distr. South and south-west coasts of Australia. 
Descr. foot scutate. Fronds densely tufted, 1-1} inch high, irregularly di- 
vided ; sometimes but slightly branched, sometimes multipartite. Branches 
filiform or subulate, acute, nearly straight or curved, either quite simple, or 
once, twice, or several times divided ; sometimes dichotomous, sometimes 
palmate. Ramuli erecto-patent, not attenuated at base. Cystocarps im- 
bedded near the tips of the ramuli, the nucleus consisting of many honey- 
combed loculi, with fibro-cellular walls to which the solitary, pear-shaped 
