Ser. RHoDOSPERME. Fam. Gasterocarpee. 
Pruate CXII. 
HALYMENIA LIGULATA, 4%. 
Gey. Cuan. Frond compressed or flat, pmky red, gelatinoso-membranaceous, 
consisting of a delicate membrane, whose walls are separated by a very 
lax net-work of jointed fibres ; cells of the membrane minute, coloured. 
Fructification, spherical masses of spores (/avel/idia) immersed in the 
frond, attached to the inner surface of the membranous periphery. 
Hatymenta (4g.),—from as, the sea, and dpny, a membrane. 
Hatymenta ligulata ; frond compressed or flat, irregularly dichotomous or 
palmate, the segments attenuated, often proliferous at the margin. 
HatyMEnI< ligulata, 4g. Sp. dig. vol.i. p.210. dg. Syst. p. 244. Spreng. 
Syst. Veg. vol.iv. p.333. Grev. Alg. Brit. p. 162. t.17. Hook. Br. Fi. 
vol. iu. p. 308. Harv. in Mack. Fl. Hib. part 3. p.188. Harv. Man. p. 52. 
Wyatt. Alg. Danm. no. 425. Endl. 3rd Suppl. p. 40. 
HatyMeEnia elongata, 4g. Sp. Aig. vol.i. p. 209. Ag. Syst. p. 243. J. Ag. 
Medit. p. 98. 
HALARACHNION ligulatum, Kiitz. Phyc. Gen. p. 394. t. 74. £1. 
Unva ligulata, Woodw. in Linn. Trans. vol. i. p. 54. EF. Bot. t. 420. 
Uxva rubra, Huds. Fl. Ang. p.571. £. Bot. t. 1627. 
Mesoetora Hudsoni, 4g. Syst. p. 50 (not of British authors). 
Has. On rocks and stones near low-water mark, rare; more usually dredged 
in 6-10 fathoms water. Annual. Summer. Frequent on the 
southern shores of England, in many places. Coast of Norfolk, Mr. 
L. Wigg, Mr. Turner, &c. Anglesea, Rev. H. Davies. East, south 
and western shores of Ireland. Very common in Jersey, Wiss White 
and Miss Turner. Rare in Scotland; Orkney, Rev. J. H. Polleafen. 
Grocer. Distr. Atlantic shores of Europe. Mediterranean Sea. 
Descr. Root small, scutate. Frond extremely variable in ramification, and even in 
substance, but resolvable into three principal varieties. a.dichotoma ; frond six 
to eight inches long, from half a line to one or two lines broad, compressed, very 
gelatinous, many times divided in an irregularly dichotomous manner, the 
divisions nearly of equal breadth, becoming gradually narrower toward the 
extremities, which are acuminate. £8. ramentacea; frond twelve to fourteen 
inches long, or more, half an inch in breadth, compressed, gelatinous, di- 
vided into three or four principal branches, from the sides of which issue 
very numerous, simple or occasionally forked ramenta constricted at base, 
tapering to an acute point, cylindrical or nearly so. Occasionally the 
ramenta are very thin, almost setaceous, and proportionably numerous and 
subdivided. y. latifolia; frond twelve to twenty inches long, two to four 
inches wide, perfectly flat, stipitate, wedge-shaped, simple or forked, or 
irregularly palmate, of a darker colour, and less gelatinous substance than 
the two former varieties. Colour varying from a pale to a strong rose-red, 
or in the broad variety a deep red. Sudstance gelatinous and tender, very 
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