P l a t e LXVI.
HALIDRYS SILIQUOSA, Lyngh.
G en C h a e . Frond compressed, linear, pinnated with distichous branches.
Air-vessels lanceolate, stalked, divided into several cells by transverse
partitions. Receptacles terminal, stalked, ceUular, pierced by nume-
rons pores, which communicate with immersed spherical conceptacles,
containing parietal spm-es and tufted antheridia. H alidets {Lyngh.)
— from à\s, th e sea, and bpis, an oalc.
H alideys siliqnosa-, branches linear, very narrow; air-vessels compressed,
Hnear-lanceolate, slightlyjoonstrioted a t th e septa, mucronate.
H a l i d e y s siliquosa, Lyngb. Hyd. B a n .p . i l . Grev. Alg. L U A
Hook. Brit. M. vol. ii. p. 266. Wyatt, Alg. Banm 53 Harv in Mack.
M. Hib. part 3. p. 168. Harv. Man. p. 19. Endl. 3rd Suppl. p. 30.
C y s t o s e i e a siliquosa, Ag. Sp. Alg. vol. i. p. 72- P'
Syst. Veg. v o l iv. p. 317. Gi-ev. El. Edm. p. 285.
Fuous süiquosus, Linn. S p .P l. p ^ l8 2 9 .
p 365. G9b. ffisL p. 81. t. 2. B. FI-Ban. 1. 106. Huds El Ang. ^ 5 1 4
Lightf. El. Scot. vol. ii. p. 921. With. vol. iv. p. 88 Good a id Woodw
in Linn. Trans, vol. iii. p. 134. F. Bot. t. 474. Stadc. Ner^ B n t. p. 8 . t. 5.
Turn. Syn. vol. i. p. 60. Hist. 1 .159. Esper, Ic. Eue. t. 8.
Fu ous süiculosus. Stack. Ner. Brit. 1 .11. . i -n
I I ab. On rocks and stones in th e sea, a t and below half lev®!. Perem
nial. W in te r and Spring. Common on th e shores of th e British
Islands.
G e o g e . D i s t . North Sea, aud Northern Atlantic.
D is te Bxot a large, conical disc. Eronds, from one to four feet long or more,
L a r c o ~ e d . two-edged, from one to two hues in breadth, flexuous,
mostfy undivided, distichously pinnate or bi-pinnate. P » ®
patent issninc^ with an obtuse axil; the lower ones much lengthened, and
either naked below, or furnished with a few smaU branchlets and air-vessels,
pinnate or bi-pinnate above, the smaller divisions set with alteniate vesicles
or with’ receptacles ; the upper pinnæ gradually shorter, more simple, and
better furnished than the lower, and g e n e r%
of vesicles or of receptacles. Air-vesseU hnear, oblong, or lanceolate, supported
on slender stalks, and tipped by a linear niucro of vanous length
from a quarter inch to an inch and a half, and S t o v e r e
apex a receptacle. The air-vessels are externally marked with transverse,
cLstricthro-Ues, very visible when dry. which con-espond to rnternal septa
Z i “ he hoÙow inside into numerous distinct chambers, through
which run several longitudinal threads. Receptacles erther forirung racernes
at the apices of the branches, or terminatiir^g the mncrones
lanceolate, subacute, on short stalks, distichous, compressed, furmshed with
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