ULVACEJi. 129 



and folded. Quaternate granules beautifully arranged in squares, con- 

 tained in larger ones, and separated by parallel pellucid lines, the whole 

 compared by Agardh to the walks and parterres of a garden. Annual. 

 Found throughout the winter and early spring. Eng. Bot. p. 111. 



Plate L. fig. 1. Plants slightly magnified. Fig. 2, portion of a frond 

 X 400. 



Pxasiola furfur ace a. Menegh. Cenni. p. 36. 



Forming a furfuraceous stratum, more or less expanded, dark 

 green. Thallus about a line long and broad, dilated from the 

 short stem-like base into a fan-like lamina ; margin slightly 

 undulate and repand, often emarginate at the apex or lobed. 

 Cells angular, arranged in regular quadrate, or almost quadrate 

 areolas. 



SIZE. Cells '014--016 X -004--006 mm. 



Jessen, Mon. Pras. t. 2, f. 1-10. Kabh. Alg. Eur. iii., 309. 

 Lagerstedt Pras. p. 32. 



Ulva furftiracea, Grev. Sc. Crypt. FL t. 265. Eng. Fl. v., p. 

 312. Harv. Man. 171. Eng. Bot. ed. ii., p. 112. Grev. Alg. 

 Britt. 176, t. 18. Mack. Fl. Hib. 244. 



On damp walls and rocks. 



" Fronds closely tufted, forming a vivid green stratum, a yard or more 

 in extent, two or three 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. Cells in fours. 

 It does not adhere to paper." Garni, 



Plate L. fig. 5. Fronds slightly magnified. Fig. 6, young frond X 400. 

 Fig. 7, lower portion of mature frond X 400. 



Frasiola stipitata. Sulir. in Jessen Mon. t. 2, /. 11-16. 



Stratum csespitose, expanded, dark green. Thallus of 

 variable form and size, commonly one to two lines, rarely four 

 lines long ; dilated upwards from a stem-like base (lanceolate, 

 obovate. obcordate, reniform, flabelliform, &c.), often truncate 

 at the apex ; margin slightly repand ; cells in the stem-like 

 base in series, in the upper part disposed in small regular 

 areolas. 



SIZE. Cells -G05--007 mm. 



Jessen, Prasiola p. 16, t. 2. Rabh. Alg. Eur. iii., 309. 

 Lagerstedt. Pras. p. 36, fig. 4. 



On rocks by the sea, &c. 



Jessen, in his monograph of this genus, gives figures of the fronds of 

 some Irish specimens of the above species, which he had seen and 

 examined. It is, on the faith of this, included here, although it appears 

 to be the most marine of any of the four. 



Plate L. figs. 8. 9. Fronds of P. stipitata magnified 4 diam. Fig. 10, 

 young frond X 400. Fig. 11, part of mature frond X 400. All after 

 Jessen. 



