Ser. RHODOSPERME. Fam. Delesseriee. 
Puate CCLIX. 
DELESSERIA SINUOSA, Zamow. 
pN.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 containing a globular 
mass of angular spores; 2, ¢etraspores, forming defined spots im the 
frond, or in leaf-like processes. Detussrrta (Lamour.),—im honour 
of Baron B. Delessert, a distinguished botanist and patron of Botany. 
SSERIA sinuosa; stem elongated, branched, beset with oblong or ob- 
ovate, deeply- sinuated or pinnatifid, toothed, transversely-ribbed 
leaves. 
JELESSERIA sinuosa, Lamowr. Ess. p. 124. Lyng. Hydrop. Dan. p. 7. t. 2. 
Ag. Sp. Alg. vol.i. p.174. Ag. Syst. p. 248. Hook. Fl. Scot. part 2. 
p- 100. Grev. Fl. Edin. p. 292. Grev. Alg. Brit. p.73. Hook. Br. Fl. 
vol. ii. p. 285. Wyatt, Alg. Damn. no. 62. Harv. in Mack. Fl. Hib. 
part 3. p.191. Harv. Man. ed.1. p.55. Endl. 3rd Suppl. p. 53. 
VORMSKIOLDIA sinuosa, Spreng. Syst. Veg. vol. iv. p. 331. 
wcus sinuosus, Good. and Wood. in Linn. Trans. vol. ui. Eng. Bot. t. 822. 
Turn. Syn. p.1. Turn. Hist. t. 35. 
pus crenatus, Gm. Hist. Fuc. p. 184. t.24. f.4. Linn. Syst. Gm. p. 1388. 
Bcus rubens, Huds. Fl. Ang. p.573. Lightf. Fl. Scot. p.943. Stack. Ner. 
Brit. p. 18. t. 7. 
cus roseus, FV. Dan. t. 652. 
us Palmetta, varietas, Hsper, Ic. Fuc. vol. i. p. 84. t. 42. 
Parasitical on the stems of Laminaria digitata; also attached to 
various substances in deep water. Perennial. Summer and autumn. 
Common on the British shores. 
R. Distr. Atlantic shores of Europe and North America. 
. Root a small disc. The frond originates in an oblong or obovate, deeply 
sinuated, or pinnatifid leaf, four to six inches in length, and from one to 
our inches in breadth, furnished with a strong, percurrent midrib, pinnated 
vith secondary, opposite nerves, one of which runs to the apex of each 
acinia of the frond. As the growth of the plant proceeds, the lacinie 
ecome deeper and deeper, and at length the cutting between each reaches 
he mid-rib; and at the same time the margins of each lacinia become 
rst toothed and then incised, while lesser opposite nervelets are given off 
o the marginal teeth by their primary nerve. At this stage the midrib of 
wf the first-formed leaf has become a stem pinnated with a great number of 
eaves, of similar form and structure to what the first leaf had been; and at 
| further period various irregularities of branching, some caused by lace- 
ation, some by proliferous growth, take place, till there results a much 
ranched stem, well clothed with pinnatifid leaves. The margin is some- 
imes slightly toothed, and sometimes cut into very slender processes, or cilia ; 
and not uncommonly, when the plant vegetates at a depth of 6-10 fathoms, 
> JME G 
