Ser. RuoposPERME®. Fam. Spherococcoidee. 
Puatse CCV. 
GRACILARIA COMPRESSA, Grev. 
Grn. Car. Frond filiform, or rarely flat, carnoso-cartilaginous, conti- 
nuous, cellular; the central cells very large, empty, or full of granular 
matter; those of the surface minute, forming densely packed, vertical 
filaments. Fructification of two kinds on distinct individuals; 1, 
convex tubercles (coccidia) having a thick pericarp composed of 
radiating filaments, contaiming a mass of minute spores on a central 
placenta; 2, ¢e¢raspores imbedded in the cells of the surface. Gra- 
ciLaRia (Grev.)—from gracilis, slender. 
GRacitarta compressa; frond succulent, brittle, somewhat compressed, 
alternately or subdichotomously branched ; branches long and mostly 
simple, tapering to a fine point; tubercles ovate or subglobose, 
sessile, scattered plentifully over the branches; tetraspores tripartite 
or cruciate. 
GRACILARIA compressa, Grev. Alg. Brit. p.125. J. Ag. Alg. Medit. p.15). 
PLocaRIA compressa, Endl. 3rd Suppl. p.51. Mont. Fl. Algier. p. 71. 
GIGARTINA compressa, Hook, Br. Fl. vol. ii. p. 299. Wyatt, Alg. Danm. n.25. 
Harv. Man. p. 74. De Not. Alg. Ligust. p. 14. 
SpH#Rococcus compressus, 4g. Sp. Aig. vol.i. p. 308. Ag. Syst. p. 233. 
Spreng. Syst. Veg. vol. iv. p. 338.  Kiitz. Phyc. Gen. p. 408. 
Spu#rococcvus lichenoides, Grev. Crypt. Fl. t. 341. (not of Agardh.) 
Has. Cast on shore from deep water, attached to corallines, &e. Annual. 
Summer. Very rare. At Sidmouth, Mrs. Grifiths (1813) and 
Miss Cutler. Jersey, Miss Turner. 
Grocer. Distr. Atlantic coasts of France and Spain. Mediterranean Sea. 
Descr. Roof, a small expanded callus. Fronds several from the same base, six 
to twelve inches long or more, from a line to two lines in diameter, brittle, 
much, but very irregularly, branched. Branches sub-compressed, some- 
times nearly distichous, frequently more or less quadrifarious, alternate or 
secund, rarely opposite, simple or forked, elongated and gradually tapering 
to an acute point, sometimes much attenuated, naked or fwmished with a 
few scattered subulate ramuli, or bearing (in large specimens) a second or 
third series of lesser branches. TZudercles large and prominent, obtusely 
conical, sessile on the branches, over which they are very plentifully scattered, 
containing, under a thick wall composed of radiating fibres, a conical mass 
of minute spores attached to filaments issuing from a central point. TZetra- 
spores imbedded in the surface cells of distinct plants, irregularly dispersed, 
roundish, either tripartite or cruciate. Substance, when fresh, very tender 
and brittle, succulent, and breaking by its own weight if hastily removed 
from the water; becoming tough in drying. Colour, a transparent, dull 
red, which becomes much brighter after the plant has been steeped in fresh 
water.—It adheres to paper in drying, and shrinks considerably. 
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