Ser. RHODOSPERMEX. Fam. Rhodometacea. 
Puate CCXLVI. 
RYTIPHLGA SIMPLICIFOLIA, Hav. 
Gen. Cuar. Frond compressed or terete, dendroid, pinnate, transversely 
striate, corticated ; the axis articulated, composed of a circle of large 
oblong cells surrounding a central cell ; the periphery of several rows 
of small, angular, (mostly) coloured cells. Hructification: 1, ovate cera- 
midia, containing a tuft of pear-shaped spores ; 2, s¢¢chidia, containing 
tripartite ¢e¢raspores.—RytipuL@a (4y.), from purus, a wrinkle, and 
frovos, bark ; because the surface is transversely furrowed or striate. 
Frons compressa v. teres, dendroidea, pinnatim composita, transversim ruguloso- 
striata, areolata ; axi articulato ex cellulis oblongis maguis pluribus cellulam 
centralem cingentibus conflato percursa; strato peripherico cellulis pluriseriatis 
angulatis corticata. Fruct.: 1, ceramidia; 2, stichidia propria, sepius sin- 
plicia, tetrasporas biseriatas includentia. 
Ryrienta@a simplicifolia; frond leafy, midribbed, repeatedly proliferous 
from the midrib, and at length falsely much-branched ; phyllodia 
linear, flat or shghtly channelled, with a slender midrib, opaque, very 
delicately striate transversely, obtuse, tapering at base into a short 
petiole; stichidia linear, involute, tufted, springing from the midmb. 
R. simplicifolia ; fronde foliacea costata a costa repetite prolifera et demum 
spurie ramosissima ; foliis linearibus planis v. subcanaliculatis costa tenur 
percursis opacis tenuissime transversim striatis obtusis basi in petiolo at- 
tenuatis ; stichidiis linearibus involutis fasciculatis e costa enatis. 
RyrieHi@a simplicifolia, Harv. Alg. Austr. Exsic.n. 133. Ll. Tasm. v. 2. 
p. 298. 
Has. Cast ashore from deep water, rare. Port Fairy, W.H. H.  Tas- 
mania, R. Gunn. 
Grocr. Distr. South coast of New Holland. Tasmania. 
Descr. Root discoid. Primary leaf from an inch to 3-6 inches long, from 1-3 
lines wide, quite flat or slightly hollow on one side, very obtuse, tapering at 
base into a short stipes, traversed by a slender midrib, from which nume- 
rous similar leaves, 1-3 or more inches in Jength, are thrown out prolife- 
rously, without any definite order. These, in like manner, bear a third, 
and those a fourth series of similar leaves, until there results (in old speci- 
mens) a bushy, much-compounded frond, made up of simple, linear leaflets. 
All the leaflets are of similar shape ; their apices are minutely inflexed or 
involute ; the margin minutely raised toward one surface; the membrane 
is thickish, opaque, not glossy, and appears under a pocket lens as if deli- 
cately and very closely striate transversely. Couceptacies unknown. — S/i- 
