206 ENGLISH BOTAXY. 



SPECIES VII.— CHARA H ISP I DA. [Oeder and other authors, 



not of Linn.*] 



Plates 1916-1918. 



Monoecious. Dark green or more often greenish-grey or greenish- 

 white, from being encrusted with carbonate of lime. Stem stout or 

 rather stout, brittle, opaque from having a thick covering of carbonate 

 of lime, spirally sulcate, clothed with twice as many cortical cells as 

 there are branchlets in a whorl, rough with few or numerous, some- 

 times very numerous, more or less fasciculated, retrorse or retrorsely- 

 spreading, setaceous, acute, deciduous spine-cells, situated on the 

 primary cortical cells in the upper part of the stem and branches ; 

 stipule-cells in 2 whorls, very conspicuous, resembling short setaceous 

 spines. Branchlets 7 to 11 in a whorl, mostly 10, rather long, rather 

 slender, ascending-spreading or slightly incurved, 6- to 9-jointed, 

 clothed with cortical cells, except one or two minute joints, [in some 

 varieties 3 to 6 joints] at the apex, which are naked. Bracts 6 to 10 

 in a whorl, setaceous, acute, unequal, from 2 to 5 of the interior ones 

 being much longer than the others, and generally twice or more the 

 length of the nucule — rarely only equalling it, the outer ones shorter 

 or more rarely rudimentary. Nucules in the axils of the bracts, at 2 

 to 5, mostly 4 of the lowest nodes of the branchlet, broadly oval- 

 ovoid, 12- to 15-striate, with a conspicuous erect-spreading persistent 

 crown. Globules solitary with the nucule and placed immediately 

 below it. 



Var. a. genuina. 



Plate 1916. 



Bram, Babenh. & Stiz. Char. Europ. Exsicc. Nos. 2, 3, 4, 49, 70, 71, 85, 86, 87, 117. 

 Nordst. & Wahlst. Char. Scand. Exsicc. Nos. 55a and b, 56, 57a and b, 58, 59, 59b, 60a, 



b, c, and d, 61 ; (rudis, 62, 63, 64a and b, 65, 66) ; (horrida, 98, 99a and b, 100, 



101.) 

 Chara hispida, Oeder, Fl. Danica, 1. 154. Sm. Eng. Bot. No. 463. Wallr. Annus Bot. 



p. 187, t. iv. Bruz. Obs. Char. pp. 9 and 20. Agardh, Syst. Alg. p. 128. Bischoff, 



Krypt. Gewachse, p. 26, t. i. f. 9-11 ; and Handb. Bot. Term, und Syst. t. 56, f. 



2799-2801, and t. 57, f. 2813. A. Broun in Ann. Sciences Nat. 2nd ser. Vol. I. 



[* According to Linnaeus' type specimen, the plant he described as C. hispida is that 

 now well known as C. aspera ! But the name C. hispida is so universally adopted for 

 the plant here described as such, that there is little use now in substituting the name 

 C. spinosa, Eupr. for it, which should be done if the Linnean name C. hispida were 

 retained for C. aspcra.~\ 



