Ser. RHODOSPERMEA. Fam. Gelidiacee. 
Puate CCXLVIII. 
PTEROCLADIA LUCIDA, J 4%. 
Gen. Cuan. Frond linear, two-edged, imperfectly midribbed, pinnate, com- 
posed of three strata ; the medudlary stratum of densely-packed, longi- 
tudinal fibres, the zztermediate of larger, roundish cells; the cortical 
of vertical, moniliform filaments, formed of minute, coloured cellules. 
Fructification: 1, umlocular conceptactes hemispherically prominent 
to one surface of the frond, containing, within a thick pericarp, pedi- 
cellated, obovate spores, springing from a parietal dissepiment, which 
is united to the pericarp by slender filaments; 2, cruciate ¢e¢raspores, 
forming sori in dilated ramulii—Preroctapta (J. Ag.), from mrepor, 
a wing, and Kraébos, a branch. 
Frons linearis, anceps, subcostata, pinnatim decomposita, stratis tribus contexta ; 
medullari ex fibris tenuibus longitudinalibus densissime intertextis, intermedio 
cellulis majusculis rotundatis, corticali cellulis minutis coloratis in fila verti- 
calia conjunctis composito. Kruct.: 1, cystocarpia unilocularia in alterutera 
pagina hemispherice prominentia, ad placentam parietalem effusam, fibris 
plurimis cum tecto pericarpit crassi junctam, sporas obovatas longe pedicel- 
latas, foventia ; 2, tetraspore cruciatim divise, infra apices ramulorum aggre- 
gale. 
Preroctapta lucida, J. Ag. 
Prerocuapta lucida, J. 4g. Sp. Alg. v. 2. p.483. Fl. Nov. Zel. v. 2. p. 244. 
Harv. in Trans. R. I. Acad. v. 22. p. 551. 
GeELIDIUM lucidum, Sond. Pl. Preiss. v. 2. p. 174. Harv. in Lond. Journ. 
Bot. v. 4. p.549. Kiitz. Sp. Alg. p. 763. 
PayxiopHora lucida, Grev. Aly. Britt. Syn. p. 56. 
Spu#rococcus lucidus, 4g. Sp. p. 290. Syst. p. 228. 
Fucus lucidus, Br. MSS. Turn. Hist. t. 238. 
Has. Coast of New Holland, 2. Brown. Western Australia, abundantly. 
Preiss! Mylne! W.H. H., G. Clifton. King George’s Sound, 
sh & ied 0 
Grocr. Distr. West and south-west coasts of New Holland. New Zealand. 
Descr. Root branching. Frond 6-12-18 inches long, plano-compressed, 
thickened in the centre and imperfectly costate, sharply two-edged, 1-3 
lines wide, linear, pinnately decompound; very variable in the amount of 
ramification and in the breadth of the frond. Young specimens are per- 
fectly distichous, twice or thrice pinnated; the pinnz closely set, erecto- 
patent, nearly opposite, as are also the pinnules of both seriez, blunt, rather 
