Ser. RHoposPERMEA. Fam. Spongiocarpea. 
Piate CLXIII. 
PHYLLOPHORA MEMBRANIFOLIA, 7 4%. 
Gen. Cuar. Fronds stipitate, rigid-membranaceous, proliferous, nerve- 
less, or with a vanishing nerve, cellular; cells minute, angular, 
gradually smaller towards the surface. Fructification; 1, tubercles 
( favelldia) scattered over the frond, containing masses of minute 
spores; 2, warts (nemathecia) seated on the frond, composed of radi- 
ating, moniliform filaments, whose lower articulations are at length 
converted into spores? 3, ¢etraspores (on distinct plants) collected 
into sori, either towards the apex of the frond, or in proper leaflets. 
PHyYLLopHora (Grev.),—vdrov, a leaf, and popew, to bear. 
PuytiopHora membranifolia; stem cylindrical, filiform, branched; the 
branches expanding into broadly wedge-shaped, two-lobed or dichoto- 
mous segments; tubercles oval, on short stalks arising from the 
stem or leaflets; nemathecia forming broad patches in the centre of 
the leaflets. 
PHYLLOPHORA membranifolia, J. 4g. Alg. Medit. p.93. Endl. 3rd Suppl. 
p. 38. 
RuopyMENIa membranifolia, Harv. in Phyc. Br. Syst. list, p. xii. 
CHonprus membranifolius, Grev. Alg. Brit. p.1381. Hook. Br. Fl. vol. ii. 
p. 302. Harv. in Mack. Fl. Hib. part 3. p. 202. Wyatt, Alg. Danm. no. 76. 
Harv. Man. p. 78. 
SPpH#Rococcus membranifolius, dy. Syn. p. 26. Lyngb. Hyd. Dan. p. 10.t. 3. 
4g. Sp. Alg. vol. i. p. 240. Ag. Syst. p. 214. Hook. Fl. Scot. part 2. 
p. 102. Grev. Fl. Edin. p. 295. Spreng. Syst. Veg. vol. iv. p. 335. 
Fucus membranifolius, Good. and Woodw. Lin. Trans. vol. iii. p. 120. t. 16. f. 1. 
Lam. Diss. t. 20, 21. £.3. Turn. Syn. p. 25. Turn. Hist. t. 74. Sm. E. Bot. 
t.1965. Stack. Ner. Brit. t. 20. 
Fucus fimbriatus, Huds. Fl. Angl. p. 574. ° 
Haz. On rocks and stones, between tide-marks. Perennial. Winter. 
Very common on the British coasts. 
GrocR. Distr. Atlantic shores of Europe and North America. 
Descr. Root a spreading callus. Fronds densely tufted, from three to twelve 
inches in height. Stem slender, as thick as small twine, rigid, cylindrical, 
repeatedly branched in an irregularly dichotomous manner; _ branches 
simple, or bifid, one, two, or more inches in length, spreading, 
gradually becoming compressed upwards, and expanding into a wedge- 
shaped, or fan-shaped, more or less divided frondlet. Frondlets rigid- 
membranous, repeatedly dichotomous, the axils and apices obtuse, the 
latter sometimes bifid. In old specimens, besides the terminal frondlet, 
the branches give off very numerous lateral ones of a smaller size, which 
are simply bifid, and of a narrow wedge-shaped outline: the abundance of 
these sometimes makes the specimen very bushy. Apices fastigiate. Fructi- 
VOL. II. L 
