Ser. RuoposPeRME. Fam. Delesserea. 
Puate II. 
-DELESSERIA HYPOGLOSSUM, ¥. 
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 containing a globular 
mass of angular seeds; 2, granules (tetraspores) forming defined spots 
in the frond, or in leaf-like processes. 
Detusserta Hypoglossum ; frond lnear-lanceolate, tapering at each end, re- 
peatedly proliferous from the midrib, with leaflets of similar form ; 
tubercles on the midribs of the smaller leaflets; granules forming 
linear spots at each side of the midrib. 
De esseria Hypoglossum, 4g. Sp. Alg. vol. i. p. 176. Syst. p. 249. Grev. 
Fl. Edin. p. 293. Alg. Brit. p. 15. +.12. Hook. Br. Fl. vol. ii. p. 286. 
Mack. Fl. Hib. vol. i. p. 191. Harv. Man. p.56. Wyatt. Alg. Dani. no. 63. 
J. Ag. Medit.p.157. Endl. 3rd Suppl. p. 52. Montag. Pl. Cell. Canar. p.150. 
Dexesseria Hypoglossum, Lamowr. Ann. Mus. xx. p. 124. 
WormskroLp1 Hypoglossum, Spreng. Syst. Veg. vol. iv. p. 331. 
Hypoeiossum Woodwardii, Kiitz. Ph. Gen. p. 444. t. 65. £1. 
Fucus Hypoglossum, Woodw. in Linn. Trans. vol. ii. p. 30. t.7. Linn. Trans. 
vol. ii. p.113. With. vol.iv. p.95. Eng. Bot. t.1396. Turn. Syn. Fuc. 
vol.i. p.17. Hist. t.14. Esp. Ic. Fue. vol. ii. p. 17. t. 120. 
Fucus hypoglossoides, Stack. Ner. Brit. p. 76. t: 13. 
Utva lingulata, De Cand. I'l. Fran. 2nd edit. vol. ii. p. 14. 
Has. In the sea, on rocks and Alge. Annual. Summer. Frequent on 
the shores of England and Irelands rare in Scotland. 
Groer. Disrr. Atlantic shores of Europe, frequent. Rare in the Mediterranean, 
and of small size. Canary Islands, Wedd. 
Desc. Root,a minute disc. Fronds tufted, consisting of a primary leaf 2-8 inches 
in length, and from a line to half an inch in breadth, linear-lanceolate, rose- 
red and membranous, with a distinct midrib, and faint traces of obliquely 
transverse striz, throwing out from its midrib numerous similar leaves, 
which again produce others, until the plant becomes exceedingly bushy and of 
a globular figure. The apices of the leaflets are more or less tapering or acute. 
If placed in fresh water the colouring matter is soon discharged. The tu- 
bercles are globose, forming a dark-red swelling in the substance of the mid- 
ribs of the smaller leaflets, generally about their crentre, and contain a large 
number of minute seeds; and the granules form linear patches along the 
midribs of the leaves of distinct, and generally more luxuriant, plants. 
eee 
Our figure, which represents a larger state of the plant than is 
commonly met with, though by no means the largest we have 
B2 
