I
P l a t e XIX.
HALISERIS POLYPODIOIDES, Ag.
Gen. Chae. Root, a mass of woolly filaments. Frond flat, linear, membranaceous,
with a mid-rib. Fructification : ovate spores, forming
distinct sori, or groups, mostly arranged in longitudinal lines. Orev.
H aliseeis—from Sks, the sea, and a-épK, endive.
H a l is e e is polypodioides; frond dichotomous, entire at the margin, plane;
spots of fructification hnear, disposed along the mid-rib..
H a l is e r is polypodioides, A g .S p .J lg . vol.i. p .l4 2 . Syst. p. 262. Sprmg. Syst.
Ven vol.iv. p. 328. Grev. Alg. Brit. p. 64. t. 8. Hook. Br. FI. vol.ii.
p 283 Jiac/c. part S. p. 178. Wyatt, Alg. Banm. n o .12. Harv.
Man. p. 30. Kiitz. Phyc. Gen. p. 340. t. 23. Mont. PI. Cell. Canar. p. 148.
H ic t y o p t e r is polypodioides, Lamx. Journ. Bot. p. 19. sec. Ag.
D io t y o e t e r is elongata, Lamx. I. c. p. 18. sec. Ag.
F u c u s p o ly p o d io id e s ,D a / . v o l.i i. p . 421. Lamx.Bict. p.32. t .2 4 .f .l .
F u cu s membranaceus, Stack. Ner. Brit. p. 13. t. 6. Turn. Syn. Fuc. vol. i.
p. 141. With. vol. iv. p. 93. F. Bot. 1 .1758. Turn. Hist. t. 87.
Fu cu s ambiguns, C/m. Fss. p. 310.
U lva polypodioides, Bee. FI. Fran. vol. xi. p. 15.
H ab. On rocks and stones in the sea, from two to five fathoms. Perennial.
Summer and Autumn. Hare. Several places along the southern
shores of England, where Mr. Stackhouse first gathered it. hluelds,
Mr. Winch. Miltown Malbay, W.II.H. (1831). Toughal, M u s
Ball. Eoundstone Bay, Mr. M d Calla. Jersey, Miss White; Miss
Turner.
G e o g r . D i s t r . Atlantic and Mediterranean shores of Europe. Noi-th of
Africa, Besf. Ceylon, Herb. Unn. South Africa, Fcklon. Bahia, Martms.
Canary Islands, very rare, Bespreaux.
D e s c r . Boot a callous disc, densely covered over with finely ¿ivicled tough,
matted fibres. Fronds growing in tufts, 4 -1 2 inches high about half an
inch wide linear, several times dichotomous, the axils patent, traversed by
a dark coloured, filiform mid-rib, which is very strong below, and becomes
gradually thinner upwards. The apices of the segments are obtuse or
Marginate, in which case the tip of the mid-rib is forked. The margin is
fiat L d entire. The membrane of the frond is rather rigid, thin and
tears with great facility in an obhque direction from the margin to the
mid-rib, and the lower parts of full grown fronds are very generally much
lacerated. Not unfrequently proHferous shoots are produced, especiaUy
from old. weather-beaten plants, at points along the mid-rib. m u c tfic kw n
of two kinds has been observed, on distinct individuals. The fii'st and
regular kind consists in oblong sori or groups of efiiptical spores lying
close at either side of the mid-rib ; the second in scattered single spores (?)
of larger size than the former, dispersed over the frond. Colour, a clear
olive-green, with a tinge of yellow; becoming foxy m age, and darker m a
dry state. Smell when freshly gathered, strong and disagreeably pungent.