ii
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P l a t e CCCXXIV.
LEATHESIA TUBERIEORMIS, A A-. (7r«y.
G e n . C h a b . Frond globose or lobed, fleshy, composed of jointed, colourless,
dichotomous filaments, issuing from a central p o in t; their
apices, which constitute a fleshy coating to the frond, coloured and
tufted. Fructification, oval or pyriform spores, concealed among
the coloured apical filaments. L e a t h e s ia (-S'. F. Gray),—in honour
of the Eev. G. E. Leathes, a British naturalist; and who first com-
muuioated this plant to Sir J . E. Smith.
L e a t h e s ia tuheriformis-, fronds olivaceous, tuberous, when young stuffed
with cottony fibres, at length hollow.
L ea th e sia tuberiformis, S. F. Gray, Nat. A r . Br. PI. vol. i. p. 301. Harv.
Man. ed. 2. p. 48.
L ea th e sia marina, Endl. 3rd Supp. p. 23. Kütz. Sp. Alg. p. 543. J. Ag.
Sp. Alg. vol. i. p. 52.
L ea th e s ia difformis, Aresch. E/mm. Phyc. Scand. p. 154. t. 9. f. B.
COKYNEPHOKA marina, Ag. Syst. p. 24. Harv. in Hooh. Br. Ft. vol. Ü.
p. 390. Harv. Man. ed. 1. p. 46. Wyatt, Alg. Danm. no. 149. Grev.
Crypt. Scot. t. 53. Harv. in Much. FI. Hib. part 3. p. 184.
CHjETOPHOKA marina, Lyngb. Hyd. Dan. p. 193. t. 66.
N ostoc marinum, Ag. Disp. p. 45. et Syn. p. 133.
ÏBEMELLA difformis, Linn. Syst. Nat. p. 714. Huds. FI. Ang. vol. ii. p. 565.
With. vol. iv. p. 82.
E iviieakia tuberiformis, E. Bot. 1 .1956.
U a b . Between tide-marks, on rooks, corallines, and the smaller Algæ;
very common. Annual. Summer and autumn.
Geogb. D is t b . Atlantic shores of Europe. Baltic Sea. East coast of North
America. Cape of Good Hope, common, W .H .H .
D esck. Eronds when growing on Algæ scattered or solitary, when on rocks
usuaUy heaped together and much crowded, forming wide-spreading tuber-
culated masses, very variable in size, from that of a pea to that of a large
walnut. When young, tbe interior of tbe tuberous frond is stuffed with
weak empty, dichotomous, cobweb-like fibres, rising from the base and
radiating in all directions, hut as the outer waU extends, these graduaUy
perish and the plant becomes a hollow ball. The lowermost ceUs of the
cobwebby fibres are very long and slender ; the upper ones become
graduaUy shoider and wider, and are two-homed, or somewhat hali-moon«
shaped, a new cell springing from each cusp ; those which adjoin to the outer
wall are smaU and globose. The outer waU is formed of closely-packed,
moniliform, club-shaped, vertical filaments, lying in a transparent jelly ;
each filament formed of several spherical ceUs eontammg olive granule^
pyriform, sunk among the club-shaped peripheric filaments, with
y
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