Ser. RuoposrermE®. Fam. Rhodymeniacee. 
Puate CCXCIV. 
ARESCHOUGIA STUARTII, Zar. 
Grn. Cuan. Frond compressed or filiform, vaguely branched, composed 
of an articulated axial filament, and three (rarely but two) strata 
of cells; the medullary stratum consisting of longitudinal, anasto- 
mosing, interwoven filaments ; the cx¢ermediate (sometimes absent) of 
several rows of roundish, coloured cells; the cortical of minute, ver- 
tically seriated cellules. Fructification: 1, conceptacles immersed in 
the frond, suspended among the filaments of the medullary stratum, 
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 on the cor- 
tical stratum of the ramuliimAruscuoveia (Harv.), in honour of 
Dr. J. E. Areschoug, Professor of Botany at Upsal, a distinguished 
algologist. 
Frons compressa v. filiformis, vage ramosa, immerse costata, e filo centrali arti- 
culato et stratis fere tribus cellularum constituta. Stratum medullare e filis 
articulatis longitudinalibus anastomosantibus intertextis, intermedium (nunc 
deficiens) e cellulis rotundatis majusculis pluriseriatis, corticale e cellulis mi- 
nimis verticalibus formatum. Fruct.: 1, cystocarpia fronde immersa, 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 ra- 
mulorum nidulantes. 
Arescuouctia Stuartii ; frond flattened, two-edged, closely branched, de- 
compound-pinnate ; pinne tapering to base and apex ; pinnules nearly 
lanceolate, acute at each end, erecto-patent, bearing immersed cys- 
tocarps. 
A. Stuartii; fronde plano-compressa ancipite crebre ramosa decomposito-pinnata, 
pinnis basi et apice angustatis, pinnulis fere lanceolatis utrinque acutis erecto- 
patentibus cystocarpia timmersa gerentibus. 
Arescnoucta Stuartii, Harv. in Fl. Tasm. v. 2. p. 321. 
Has. Southport, Tasmania, C. Stuart. Warnambool, H. Watts. 
Geoar. Distr. South coast of Australia. Tasmania. 
Descr. Root a small disc. Frond 4-5 inches high, and as much in the spread 
of the branches, distichously much branched, strongly compressed or flat- 
tened, two-edged, about 3—{ of a line in breadth. The branching is irre- 
gularly decompound-pinnate, sometimes with close sometimes with remote 
