! (
! 1
1'^'"
1 r t t o i
4ri/to I ' '/ '1 i
Y'---' .
\S
1 i I I
k j I I
1 1 '■ / \ 1
)' T' J 1 ' '
c '»«
1
PLATE LXXXVIIL
CATENELLA OPUNTIA, Grev.
Gen. Cilae. Frond dull-purple, membranaceous, filiform, constricted at
intervals ; its axis composed of a lax net-work of anastomosing, longitudinal
filaments ; its periphery of densely compacted, diohotomous,
moniliform filaments. Fructification of two kinds, on distinct individuals
; 1, spherical masses of spores (favellidia), contained in external
. capsular bodies (abortive ramub, resembling ceramidia) ; 2, solitary
oblong, transversely parted tetraspores, surrounded with a limbus, anct
formed from the filaments of the periphery, in which they are immersed.
C a t e n e l l a {Grev),— a little chain, “ in allusion to the
chain, or necklace-like form of the frond.”
Catenella opuntia ; fronds rising from a mass of. creeping fibres, vaguely
branched ; pseudo-articulations lanceolate or elliptical, about four times
as long as broad.
Ca t e n e l l a opuntia, Grev. Alg. S r it. p. 166. t. 17. Hook. Br. M. vol.ii.
p. 309. Harv. in Mack. PI. Hih. part 3. p. 188. Harv. Man. p. 51.
Wyatt, Alg. Banm. no. 126. / . Ag. Alg. Medit. p. 89. Pndl. 3rd Suppl.
p. 37. PMz. Phyc. Gen. p. 394. t. 76. f. 4.
C h o k d a m a o p u n tia , Spreng. Syst. Veg. v o l.iv . p . 3 3 0 .
L om en ta e ia opuntia, Gaill. Bict. Hist. Nat. v. 53. p. 367.
H a l y m e n ia ? opuntia, Ag. Sp. Alg. vol. i. p. 217. Syst. p. 245.
Ch o n d e ia o p u n tia . Hook. PI. Scot. p a r t 2. p . 1 0 6 . Grev. PI. Edin. p. 2 9 2 .
G ig a e t in a o p u n tia , Lamour. Ess. p . 4 9 .
G ig a e t in a p ilo sa , Lamour. I. c. p . 4 9 (see A g ).
B iv u l a e ia opuntia, Gm. Eng. Bot. t. 1868.
F u cu s opuntia. Good, and Woodw. in Linn. Trans, vol. iii. p. 219. Stack.
Ner. Brit. p. 104. t. 16. Turn. Syn. Eue. vol. ii. p. 387. Turn. Hist. 1.107.
F u cu s repens, Lightf. El. Scot. vol. ii. p. 961. With. vol. iv. p. 91.
Fuous cæspitosus. Stack. Ner. Brit. p. 59. t. 12.
U lva a rtic u la ta p. Huds. PI. Angl. p . 5 6 9 .
H ab. On submarine rooks, piles, &c., near high-water mark. Perennial.
Not uncommon on the shores of England, Ireland, Scotland, aud the
Orkney Islands. Earely found in fruit.
G e o g e . D i s t e . Atlantic shores of France and Spain. Mediterranean Sea. New
Zealand, Br. Hooker.
Desce. Eoot, a mass of creeping, irregularly branched fibres. Prends springing
from the creeping fibres, erect, densely tufted, and forming patches two or
more inches in diameter, spreading over any substance which they encounter,
half an inch to nearly an inch in height, sparingly branched, constricted
at intervals into a string of oblong or lanceolate pseudo-articulations.
Branches similar to the main stem, alternate or opposite, simple or forked,
their terminal joints acute. Substance membranaceous. Structure; the
2 Y
rivi