82 BRITISH OHAEOPHTTA. 



In Hudson's ' Flora Anglica ' (1762) the four Linnean 

 names are given : — (1) G. tomentosa (for large forms of 

 G. vulgaris) ; (2) G. vulgaris (for G. fragilis and the 

 smaller forms of G. vulgaris) ; (8) G. hispida ; and (4) 

 G. flexilis (for N. flexilis and N. opaea). In Smith's 



* Flora Britannica ' (1 800) the same four are given, 

 but Hudson's G. tomentosa is reduced to a variety of 

 G. hispida. "Withering, in his ' Botanical Arrange- 

 ment ' (1776), gives in addition to these G. repens as 

 the name for Sherard's Jersey plant. In ' English 

 Botany ' G. nidifica {Tolypella glomerata) (1807), G. 

 translucens (1808), and G. gracilis (1810) are added. 

 S. F. Gray, in ' Natural Arrangement of Brit. 

 Plants ' (1821), describes G. stellata (apparently N. 

 tenuissima) , and adds ' G. crinita ' {G. polyacantha). 

 Greville, in ' Scottish Cryptogamic Flora,' vol. vi 

 (-1828), adds G. aspera. In 1830, Wilson, in Hooker's 

 ' Bot. Miscellany,' describes under the name of G. 

 gracilis a dioecious plant (iV^. capitata?). In Hooker's 



* Brit. Flora,' vol. ii, part 1 (1833), eight species : 

 translucens, flexilis, nidifica, gracilis, vulgaris, Hedwigii, 

 aspera, and hispida, are given, G. Hedwigii being an 

 addition. The Rev. M. J. Berkeley, in ' E. B. Suppl.,' 

 vol. ii (1834), figures G. Hedwigii, and in a note 

 thereto gives a description of ' G. nidifica ' from 

 Henfield (2'. prolifera). In 1841, in the second 

 (Johnson's) edition of ' English Botany,' the two 

 genera, Ghara and Nitella, are given. Hooker, in 

 'Lond. Journ. of Bot.' (1842), records G. latifolia {G. 

 tomentosa) as British, and in ' Icones Plantarum,' vol. 

 vi, gives a figure of it. Berkeley, in ' B. B. Suppl.,' 

 vol. iii (1843), figures G. pulchella (G. fragilis). 



" In 1850 commenced a new era in the knowledge of 

 our Charas, when Prof. Babington, in his monograph 

 in the ' Annals and Magazine of Nat. Hist.,' com- 

 pletely rearranged the species. G. syncarpa (Thuill.) 

 was then first definitely separated from G. flexilis ; G. 

 mucronata and G. crinita Wallr. (0. canescens), were 

 added ; the number of the Tolypellx was increased 



