Ser. CHLOROSPERMES. Kam. Ulvacee. 
Puate CCXI. 
PORPHYRA VULGARIS, «4%. 
Grn. Cuar. Frond delicately membranaceous, flat, purple. Fructification, 
granules, arranged in fours, scattered over the whole frond; also 
“scattered sori of oval spores.” PorpHyra (4y.),—from sopqupos, 
purple. 
Porruyra vulgaris; frond simple, lanceolate, entire, the margin more or 
less waved. 
PorpuyRa vulgaris, 4g. Aufz. p. 18. Grev. Alg. Brit. p. 169. Hook. Br. 
Fi. vol. ii. p. 310. Wyatt, Alg. Danm. un. 32. Harv. in Mack. Fl. Hib. 
part 3. p. 241. Harv. Man. p. 169. Hook. fil. Fl. Antarct, vol. ii. p. 500. 
Kiitz. Phyc. Gen. p. 382. Endl. 3rd. Supp. p. 19. 
PorpHyra purpurea, dy. Syst. Aly. p. 191. 
Porpuyra linearis, Grev. Alg. Brit. p. 170. t. 18. Hook. Br. Fl. vol. i. 
p- 310. Harv. in Mack. Fl. Hib. part 3. p. 241. Harv. Man. p. 170. 
Wyatt, Alg. Danm. n. 163. Endl. 3rd. Supp. p. 19, 
Uva purpurea, Roth, Cat. Bot. vol.i. p. 209. t.6. Lyngb. Hyd. Dan. p, 29. 
Ag. Sp. Alg. vol.i. p. 405. 
Has. On rocks and stones between tide-marks. Annual. Nearly 
throughout the year. Abundant on the British shores. 
Grocr. Distr. Throughout the Atlantic Ocean, from the Froe Islands to 
Cape Horn. Kerguelen’s Land. 
Descr. foot, a minute disc. Fronds from one to two feet long, and from one 
or two lines to two or three inches in width, perfectly simple, lanceolate or 
linear, tapering much at the extremity, at first ovate at the base, afterwards 
more or less cordate, rising from a very minute linear stipe. In the narrower 
varieties the margin is nearly flat, and even; in the broader it is very much 
waved, but scarcely sinuous. ructifications elliptical dark-purple granules, 
arranged in fours, dispersed through all the cells of the frond; and also 
“irregular scattered sori of larger, ovate granules, mostly situate near the 
base.” (Grev.) Substance very thin and membranaceous, very glossy, 
shrinking much in drying and only imperfectly adhering to paper. Strwe- 
ture cellular ; the frond composed of a double stratum of quadrate cells. 
Colour (owing to fructification) a more or less vivid purple. 
~~ 
—— 
This is distinguished from P. Jaciniata, already figured at our 
Plate XCII., by being perfectly simple at all ages, instead of being 
irregularly cloven; and by the much greater length of the frond 
in proportion to its breadth. Both are equally common, and 
widely dispersed over the world, and both indifferently may be 
VOL. II. a 
