Ser. RHODOSPERME”. Fam. Delesseriee. 
Pruate CLI. 
DELESSERIA SANGUINEA, Zanouw. 
Gen. Cuar. Frond rose-red, flat, membranaceous, with a percurrent mid- 
rib. Fructification of two kinds, on distinct individuals ; 1, spherical 
tubercles (coccidia), immersed in the frond, and containmg a globular 
mass of angular spores; 2, ¢e¢raspores forming defined spots in the 
frond, or in leaf-like processes.. Drtrsserta (Zamour.),—m honour 
of Baron B. Delessert, a distinguished Botanist and Patron of Botany. 
Derusseria sanguinea; stem cylindrical, cartilagmous branched, bearing 
oblong or obovate, transversely veined leaves, entire at the margin ; 
mid-rib percurrent, strong; lateral veins opposite; tubercles stalked, 
attached (in winter) to the membraneless mid-ribs of old. leaves ; 
tetraspores densely aggregated in small sporophylla, (produced in 
winter) on old mid-ribs. 
DELESSERIA sanguinea, Lamour. Ess. p. 124. Lyngb. Hyd. Dan. p. 7. t. 2. 
Ag. Sp. Aly. vol.i. p. 172. dg. Syst. p. 248. Hook. Fl. Scot. part 2. p. 100. 
Grev. Hl. Edin. p.292. Grev. Alg. Brit. p. 12. Hook. Br, Fl.vol. i. p. 285. 
Harv. in Mack. Fl. Hib, part 3. p.191. Harv. Man. p. 55. Wyatt, Alg. 
Danm. 10.13. Endl. 3rd Suppl. p. 53. Kiitz. Phye. Gen, p. 445. t. 67. 
WorMsKIOLp1a sanguinea, Spr. Syst. Veg. vol. iv. p. 331. 
Fucus sanguineus, Linn. Syst. Nat. vol. ii. p. 718. Lightf. Fl. Scot. vol. ii. 
p- 942. Huds. Fl. Ang. p. 573. Stack. Ner. Brit. t. 7. Turn. Syn. vol. i. p. 7. 
Turn. Hist. t.36. E. Bot. t. 1041. 
Has. In deep rock pools, between tide-marks, generally at the shady side 
of the pool, under projecting ledges of rock. Biennial. Fruitmg in 
winter. Common on the British coasts, from Orkney to Cornwall. 
-Gsoer. Distr. Atlantic shores of Europe. Baltic Sea. A variety found by 
Dr. Hooker at Hermite Island, Cape Horn. 
Descr. Root a hard, conical disc. Stem cartilaginous, from one to six or eight 
inches, or more in length, more or less branched, one to three lines in 
diameter, nearly cylindrical or variously swollen and mis-shapen, producing 
on all sides, throughout its length, numerous, irregularly placed leaves. 
Leaves shortly petiolate, from four to eight or ten inches in length, and 
from one. to four or five in breadth, tapering at base, oblong or obovate, 
obtuse or more or less acute, sometimes lanceolate, when young nearly flat 
or scarcely undulate, when old very much waved; the margin perfectly 
entire. Mid-rid strong, from half a line to more than a line in diameter, 
gradually attenuated upwards, pinnated with lateral, patent or subhori- 
zontal, opposite nerves, issuing at short and equal distances, and proceeding 
towards the margin. Occasionally the leaf is divided in a manner between 
palmate and pinnate into several deep undulated lobes, whose apices are 
again lobed; and segment traversed by a branch of the mid-rib, which is 
likewise pinnated with opposite nerves. Fructification of both kinds pro- 
duced in winter on the mid-ribs of old leaves, which have lost their mem- 
VOT ne H 
