Phycologia britannica, or, A History of British sea-weeds, containing coloured figures, generic and specific characters, synonymes, and descriptions of all the species of algae inhabiting the shores of the British Islands . clearly pointed out the charactersby which this delicate plant may be distinguished from the morecommon U. latissima, and therefore I have thought it best topreserve the diagnosis given by that author in his Algae Britan-nicai. The characters are most obvious in an early stage ofgrowth, when the present plant forms an obovate sac, not veryunlike a greatly distended Enteromo
Phycologia britannica, or, A History of British sea-weeds, containing coloured figures, generic and specific characters, synonymes, and descriptions of all the species of algae inhabiting the shores of the British Islands . clearly pointed out the charactersby which this delicate plant may be distinguished from the morecommon U. latissima, and therefore I have thought it best topreserve the diagnosis given by that author in his Algae Britan-nicai. The characters are most obvious in an early stage ofgrowth, when the present plant forms an obovate sac, not veryunlike a greatly distended Enteromorpha; while U. latissima isat all periods of its growth a flat membrane. Other charactersare found in the substance and colour. U. lactuca is of a brighterand yellower green, and more glossy when dry; and its substance vol. in. c is greatly more thin and delicate than that of U. latissima. Theform of both plants is too variable to find a place among the dis-tinctive characters. U. latissima is found at all seasons andon every shore; but U. lactuca is seldom seen except in springor early summer. Fig. 1. Ulva lactuca, young and old plant:—the natural size. 2. Smallportion of the membrane :—magnified. /(afr .\.U7,\. W¥m, Ser. ChlorospermejE. Fain. Ulvacea. Plate XXXIX. ULVA LINZA, Linn. Gen. Char. Frond membranaceous, green, expanded, plane (in some casessaccate when young), composed of irregular cellules. Fructification;granules, often arranged in fours, scattered over the whole —supposed to be from Ul, water in Celtic. Ulva Lima; frond linear lanceolate, acute, crisped at the margin, com-posed of two membranes closely applied. Ulva Linza; Linn. Sp. PL p. 1633. Lujhtf. Fl. Scot. p. 973. Ft. Ban. t. Cat. vol. ii. p. 246, and vol. iii. p. 330. Ag. Syn. p. 40. Spec. i. p. 413. Lyngb. LLyd. Ban. p. 32. Grev. FL Edin. p. 299. Alg. 173. Hook. Br. Fl. vol. ii. p. 311. Harv. in Mack. Fl. Hib. part 3. p. p. 171. Wyatt. Alg. Banm. no. 16
Size: 1184px × 2109px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharveywilliamhwilliam, bookcentury1800, bookdecade1840
