Ser. RHoposPERMEX. Kam. Rhodymeniavee. 
Puates CCLXXXII. 
ARESCHOUGIA? DUMOSA, Zar. 
Gen. Cuar. Frond compressed or filiform, vaguely branched, composed of 
an articulated axile filament, and three (rarely but two) strata of cells ; 
medullary stratum consisting of longitudinal, anastomosing, inter- 
woven filaments ; the zn¢termediate (sometimes absent) of several rows 
of roundish, coloured cells; the cor¢ticat of minute, vertically seriated 
cellules. ructification: 1, conceptacles immersed in the frond, very 
rarely external, suspended among the filaments of the medullary stra- 
tum, and enclosed in a network of filaments, opening by an external 
pore, and containing moniliform strings of spores, radiating from a 
central placenta; spores roundish ; 2, zonate ¢e¢raspores, formed in 
the cortical stratum of the ramuliimAruscuoveta (Harv.), in honour 
of Dr. J. KH. Areschoug, Professor of Botany at Upsal, a distinguished 
algologist. 
Frons compressa v. filiformis, vage ramosa, tmmerse costata, e filo centrali articu- 
lato et stratis fere tribus cellularum constituta. Stratum medullare e filis 
articulatis longitudinalibus anastomosuntibus intertextis ; intermedium (nunc 
deficiens) e cellulis rotundatis majusculis pluriseriatis, corticale e cellulis mi- 
nimis verticalibus formatum. Fruct.: 1, cystocarpia fronde immersa raris- 
sime externa, inter fila strati medullaris suspensa, reticulo filorum velata, 
carpostomio demum aperta, fila sporifera moniliformia a placenta centrali 
emissa continentia ; spore subrotunde ; 2, tetraspore zonatim divise, inter 
cellulas corticales ramulorum nidulantes. 
Argscnovueia dumosa ; frond dendroid, bushy, terete; stem subundivided, 
alternately branched, the branches to all sides emitting slender, dicho- 
tomo-multifid, crowded, divaricating, obtuse ramuli; fruit. ..? 
A. dumosa ; fronde dendroidea dumosa tereti, caule simpliciusculo ramis alternis 
lateralibus onusto, ramis Tamulos setaceos dichotomo-multifidos creberrimos 
divaricatos obtusos quoquoversum emittentibus ; fructu...? 
ArescuouGcia? dumosa, Harv. MSS. in Herb. T.C_D. 
Has. Cast ashore at Warnamboul, March, 1860, H. Watts (No. 122). 
Groer. Distr. South coast of Australia. 
Descr. Root unknown. Fond cylindrical, 2-3 inches long, and as much‘in 
the spread of the branches, densely bushy and excessively ramulous. Stem 
undivided, 4 line in diameter at base, slightly tapering upwards, throughout 
beset with horizontally patent, similar branches. Branches densely covered 
