312 ALG^I INARTICULATE. [Ulva 



** Fresh-ivater species. 



4. U. bullosa, Roth, (blistered green-Laver) ; frond obovate sac- 

 cate gelatinous at length irregularly expanded floating waved and 

 bullate. Grev. Ag. Sp. Alg. v. \.p. 414. E. Bot. t. 2320.— Ulva 

 Lac ticca, /3. Huds. — Lightf. 



Stagnant pools and ditches of fresh water. 0. Spring and Summer. 

 — Much resembling U. Lactuca, but smaller, subgelatinous, lubricous, 

 firmly adhering to paper, and excessively tender. Lightfoot observes 

 that it has the appearance of being in a state of fermentation : and I 

 have, myself, in the Flora Scotica, hazarded an opinion that its differ- 

 ences from the species just-mentioned may arise from the different 

 places of growth. It is very soft and lubricous. In its texture it seems 

 to unite Tetraspora with Ulva. 



* Terrestrial species or growing on walls and rocks. 



5. U. crispa, Lightf. (crisped green-Laver); fronds densely- 

 crowded inflated plaited and wrinkled with rounded lobes — 

 Ag. Sp. Alg. p. 116. Grev. Alg. Brit. p. 175. — Ulva terrestris, 

 Both. — Ulva Lactuca, y. Huds. — Dill. Muse. t. 9.f. 6. 



Shady walls, on thatched roofs, at the foot of walls, rocks, houses, 

 &c., not unfrequent. 0. Winter and Spring. 



6. U. furfurdcea, Horn, (furfuraceous green-Laver); fronds 

 very minute roundish-ovate distinct suberect, forming a thin 

 crowded stratum. Grev — Fl. Dan. t. 1 489. Lyngb. Hydroph. 

 Dan. p. 32. Ag. Sp. Alg. v. I. p. 417. Grev. Crypt. Fl. t. 265. 

 Alg. Brit. p. 176.*. 18. 



On the tops of a few of the large boulders near the high-water line, and 

 on a rock by the side of one of the lakes of Lismore, at Jill seasons* 

 Capt. Carmichael. On the walls of King's College, Cambridge, Rev. 

 M. J. Berkeley. — " Fronds closely tufted, forming a vivid green stratum, 

 a yard or more in extent, 2 — 3 lines in length, erect, obovate, truncated 

 and usually eroded at the top, tapering at the base into a longish claw, 

 margin inflected, substance firm and void of lubricity. Sjioridia in 

 fours. It does not adhere to paper," Carm. MSS. 



7. U ? calophylla, Spreng. (delicate green-Laver); fronds caes- 

 pitose from a capillary base dilated into a membrane marked 

 Avith 4 — 12 longitudinal lines, granules biseriate in each stria. 

 Carm.— Grev. Crypt. Fl. Synop. p. 42. Alg. Brit. p. 176.— 

 Bangia calophylla, Carm. in Grev. Crypt. Fl. t. 220. 



On a stone, within 50 yards of the Manse door, Lismore; October; 

 Captain Carmichael. On old decayed pieces of railing attached to a 

 cot-house in the Greenses, Berwick, Dr. Johnston.—-" This very rare and 

 beautiful Alga grows in considerable tufts of a vivid green colour, hav- 

 ing the effect of a continued fleece covering the whole surface of the 

 stone. Filaments about a line in length, form a capillary base, dilated 

 into a lanceolate foliaceous membrane, generally flat, but sometimes 

 remarkably twisted and marked with from 4 to 12 longitudinal stripes 

 each stripe consisting of a double series of globular granules." Carm. 

 MSS.— Although arranged by Captain Carmichael among the Bangw, 



