Puate XXXV. (2B). 
CODIUM AMPHIBIUM, Moore. 
Copium amphibium; fronds minute, erect, cylindrical, simple, obtuse, 
aggregated in widely spreading strata. 
Copium amphibium, Moore et Harv. in Ann. Nat. Hist. vol. xii. (1844) 
p. 821. pl. 6. 
Has. On turf-banks at extreme high-water mark, near Roundstone, Galway, 
Mr. Me Calla. 
Groar. Distr. West of Ireland. 
Descr. Stratum indefinite, composed of entangled filaments, spreading over the 
surface of the bog. Fronds rising above the stratum, like papille, cylin- 
drical or clavate, from a line to nearly half an inch in height, and from a 
quarter-line to more than a line in diameter, erect, distinct from each other 
(not massed together), obtuse, simple; their a#is composed of branched, 
interwoven, irregular fibres, which throw off to the circumference club- 
shaped ramuli, of the same nature, and nearly the same form, as those of 
C.tomentosum. Colour a brilliant green. Substance soft. 
PO 
Codium amphibium was discovered by Mr. Me’ Calla in October, 
1843, spreading in patches of great extent along the edge of the 
sea, over the surface of a turf-bog which meets the shore at 
Roundstone Bay. In this situation the plant is exposed alter- 
nately to the influence of salt and of fresh water, and, it would 
appear, is even affected by atmospheric changes: for, its dis- 
coverer has observed, that “in dry weather it loses all its charac- 
ters, the frond shrmking to a mere nothing, but on the return of 
moisture it immediately gets fresh agai”. Specimens will, I 
understand, be published in the second volume of M’Calla’s 
‘Alga Hibernice”. 
B. Vig, 1. Coptum aMPHIBIUM :—watural size. 2. Two of the fronds :— 
magnified. 3. Filaments from the same :—more highly magnified, 
