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P l a t e CXCIX.
GIGARTINA MAMILLOSA, /. Ag.
G e n . Ch a r . Frond cartilaginous, either filiform, compressed, or flat, irregularly
divided, purphsh-red; the axis, or central substance, composed
of branching anastomosing longitudinal fibres ; the periphery
of dichotomous filaments, laxly set in pellucid jeUy ; their apices
moniliform, strongly united together. Fm c tijka tio n double, on distinct
plants ; 1, external tubercles, containing, on a central placenta,
dense clusters of spores, scattered among the filaments of the periphery.
G igart ina (Lamour.),-r-bom yiyaprov, a grape stone; which
the tubercles resemble.
G ig a rt in a mamillosa; fro n d flabelliform, dichotomous, plane , ch an n e lled ;
segm en ts wedge-shaped, cleft ; tu b e rc le s ro u n d ish o r ovate, pedicella
te , sca tte red over th e disc of th e fro n d .
Gigart ina mamillosa, J . Ag. Alg. Medit. p. 104. Endl. 3rd Suppl. p. 43.
Mastocarpus mamillosus, Kiitz. PJiyc. Gen. p. 398.
Chondrus mamillosus, Grev. Alg. Brit. p. 137. Hook. Br. El. vol. ii. p. 303.
Wyatt, Alg. Banm. no. 117. Harv. in Mack. El. H ii. part 3. p. 201.
Harv. Man. p. 77.
Sphærococcus mamillosus, Ag. Syn. p. 39. Byngb. Hyd. Ban. p. 14. t. 5.
Ag. Sp. Alg. vol. i. p. 360. Ag. Syst. p. 230. Hook. El. Scot. part 3.
p. 103. Grev. El. Edin. p. 295. Spreng. Syst. Veg. vol. iv. p. 336.
F u cus mamülosus, Good, and Woodw. in Linn. Trans, vol. iii. p. 174. Turn,
Syn. p. 237. Turn. Hist. t. 218. E. Bot. t. 1054.
Fu cus polymorphns, (fourth series) Lam. Biss. p. 3 . 1 .17. f. 37. 1 .18. f. 38.
F u cu s echinatus. Stack. Ner. Brit. p. 65. 1 .12.
F u cu s canaliculatus Huds. Fl,. Ang. p. 583.
F u cus ceranoides, vars. lig h tf. El. Scot. p. 916. Gmel. Hist. p. 115. With.
A rt. vol. iv. p. 99.
Fucu s alveolatus, Esper. Ic. p. 139. t. 70.
H ab. On rocks near low-water mark. Perenmal.
all our rooky shores.
Winter. Common on
Geogb. D is t r . Atlantic shores of Europe and North America.
D esc r. Boot, a membranous expansion. Eronds tufted, from four to eight inches
long or more, rising with an undivided stem or stipes, which is filiform at
base, but almost immediately becomes compressed, and then flattened,
widening gradually upwards till it attains from an eighth to a quarter of an
inch in breadth. At an inch or two above the base, the stipe forks; and
this mode of branching, repeated again and again, results in a many times
dichotomous, flabeUiform frond. The branches are more or less channeUed
by the introflexión of the margin ; they are very commonly twisted, often
in a spiral manner; and the upper ones are graduaUy more and more
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