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P l a t e XXXIV.
ODONTHALIA DENTATA, Lyngh.
Gen. Chab. Frond plano-convex, two-edged, vinous-red, distichous, obso-
letely ribbed, alternately toothed at the margin, ceUular ; central and
snrfaoe-cellules minute, irregular. Fructification two-fold, on distinct
plants; 1, capsules [ceramidia) furnished vltli a terminal pore and
containing a mass of pear-shaped spores ; 2, lanceolate pods [stichidia)
containing tripartite tetraspores in a double row. O d o n th a lia
[Lyngh)-—from ¿Soir, a tooth, and <j>a\os, a germ or branch.
Odonthalia dentata ; frond irregularly pinnate ; branches linear-oblong,
deeply pinnatifid; laoiniæ alternate, sharply toothed towards their
truncate extremities ; capsules and pods clustered, axiUary or marginal.
O d o n t h a l ia d e n ta ta , Lyngl. 3 y d . Ban. p . 9. t . 3. Grev. El. Edin. p . 396.
Grev. Alg. Brit. p. 101. t. 13. Hook. Br. El. vol. ii. p. 293. Harv. Man.
p. 66. Kiitz. Phyc. Gen. p. 448. Endl. 3rd Suppl. p. 47.
Rhodomela dentata, Ag. Sp. Alg. vol. i. p. 370. Ag. Syst. p. 196. Spreng.
Syst. Veg. vol. iv. p. 342.
D e l e s s e r ia dentata, Lamour. Ess. p. 36.
F ü cus dentatus, Lin. Syst. Nat. vol. ii. p. 718. Huds. El. Ang. p. 582. Lightf.
El. Scot. vol. Ü. p. 952. With. vol. iv. p. 102. Linn. Trans, vol. iii. p. 158.
Turn. Syn. vol. i. p. 149. Stack. Ner. Brit. p. 95. 1 .15. E. Bot. t. 1341.
Turn. Hist. 1 .13.
F ücus atomarius, Gmelin. Hist. Eue. p . 125. 1 .10. f. 1.
F ucus pinnatifidus, M. Ban. t. 354 (excl. Syn. Huds).
H a b . On rocks in the sea. Perennial. Fruiting in winter. Abundant
on the shores of Scotland, and of the north of Ireland. Coast of
Durham and Northumberland, rare, Mr. Winch.
G e o g r D i s t . Coast of northen Europe. Iceland. North America, Gmelin.
D e s c r . Eronds rising from a hard disk, tufted, 3-12 inches long, much
branched, furnished with an imperfect mid-rib below, which graduaUy becomes
fainter upwards, flat and membranaceous above; the main stem
simple, or forked 2-4 lines wide, alternately toothed. Branches issuing
from the axUs of the teeth of the main stem, tapering at the base, simple
or subdivided, deeply pinnatifid; the laciniæ erecto-patent, linear, entire
for more than half their length, alternately toothed above, tbe larger ones
pinnatifid, with toothed segments ; teeth very acute, erect. Eructification
horn along the margin, or confined to the axils of the teeth, ou slender, pellucid
stalks, which are either simple or branched, solitary or tufted. Capsules
somewhat pitcher-shaped, with very wide mouths, containing a cluster
of dark red, pear-shaped spores; stichidia lanceolate, nearly colouiiess,
containing a double row of dark purple tetraspores. Substance cartilagineo-
membranaceous subcoriaoeous scarcely adhering to paper. Colour a deep
vinous-red, becoming darker in drying. The smell is agreeably pungent,
but the taste is insipid.