Ser. RHopOsPERMER. Fam. Cryptonemiacee. 
Piuate CCXCVI. 
CATENELLA OPUNTIA, Grev. - 
Gen. Cuan. Frond dull-purple, constricted at intervals as if jointed, 
branched, subtubular, formed by longitudinal interlacing and anasto- 
mosing filaments, emitting toward the surface moniliform filaments, 
whose apices cohere into the membranous wall of the frond. ructi- 
fication: 1, cystocarps formed in minute, ovate or roundish ramuli ; 
2, tetraspores zonately divided, scattered through the peripheric cells. 
—Catenewia (Grev.), from catena, a chain. 
Frons purpurea, moniliformiter constricta, articulato-ramosa, subtubulosa, con- 
teata filis longitudinalibus anastomosantibus,. superficiem versus in fila monili- 
Jformia abeuntibus et in stratum periphericum muco cohibitum coalescentibus. 
Cystocarpia in ramulis minutis ovatis subglobosisve immersa. Tetraspore 
inter fila peripherica sparse, zonatim divise. J. Ag. 
CaTENELLA Opuntia; frond creeping, with procumbent shoots, densely 
tufted, irregularly dichotomous; joint-like internodes compressed, 
obovate or oblong or cylindrical, 3-5 times as long as broad; apices 
acute. 
C. Opuntia; fronde surculis procumbentibus reptante dense cespitosa subdicho- 
toma v. wregulariter ramosa, articulis compressis obovatis v. oblongis nunc 
cylindraceis diametro 3—-5-plo longioribus, apicibus acutis. 
CATENELLA Opuntia, Grev. dig. Brit. p.166.¢.17. Harv. Phyc. Brit. t. 88. 
J. Ag. Sp. Alg. v. 2. p. 352. Kiitz. Syst. p. 124, ete. 
Fucus Opuntia, Good. and Woodw. Stack. Ner. Brit. t. 16. Turn. Hist. t. 
107. 
HALyMENIA? Opuntia, Ag. Syst. p. 245. 
Rivutarta Opuntia, #. Bot. t. 1868. 
Has. Crevices of rocks near high-water mark. Shores of Elizabeth Bay, 
Port Jackson, W. H. H. Paramatta, W. Woolls. 
Groce. Distr. Atlantic and Mediterranean coasts of Europe. New Zealand. 
Descr. Fronds springing from a mat of irregularly branched, creeping root- 
stems, erect, densely tufted, and forming patches two or more inches across, 
half an inch to nearly an inch high, sparingly and irregularly branched, 
constricted at short intervals as if jointed, and thus forming branched strings 
of oblong or obovate internodes. The branching is generally more or less 
dichotomous, and there is frequently in the Australian specimens a tendency 
to emit dise-like roots from the upper and middle nodes, especially just 
below the start-point of a new branch. ‘The internodes are strongly com- 
pressed when dry or half-dry, but are occasionally distended, and then 
