129 vn'.nped; cells roofed ^'ith thin menbre' " 3ell— . in;'v cncl v.dth the 



out'=r en'^ of the cell open. 



This is pnother genus proposed by -ciaworth in 1821 the t has 

 re^npined unnoticed by all subsequent euthors. Under his defini- 

 tion of the cheracters of the section, G^ihbos of -'esembrycnthemun 

 (Hev. Plant, 3ucc. p. 104) he remerksi " A good genus, I propose 

 the npne G-ibbaeum for it." Althoujo;h in th?t vjork he enumerates 

 the species under the f?enus I-esembryantheraum, Kaworth was undoubt- 

 edl^f rie'ht in considering that the plsnts forming his section 

 Gibbosa should be f^'enerically separated frora thet genus, for they 

 are distinguishable frora all others included in it at a glance. 

 I have, therefore, coiapiled the above cherscters for it, partly 

 from the account given by Haworth, partly from living plant, 

 ^"nfortuna tel3r, I have not yet seen flowers of any species of this 

 p-enus, '^s the conditions under v.hich I am obliged to cultivate 

 these T^iants are not conducive to their flowering, for I am surr- 

 ounded by houses, and during three v/inter months, at the very 

 period when under n-^tural conditions, they get the brightest sun- 

 shine, no direct sunlight fells upon them, and the glass gets 

 be-rimed with falling soot, tending further to decrease the light. 



I. 



'Growths some-'"hat velvety to the touch from being covered 

 with some kind of pubescence, visible under a lens, qiiite smooth, 

 si Iver^'- -white, greyish-vrhite or greyish, but under cultivation be- 

 coming greenish or ^-hitish-green. 



1. ^. riubescens, N.3. ^r. (^ig. 64, -^,3, and '^.) flant 

 under natural conditions, nearly stemless, vrith the grov-ths crow- 

 ded into a tuft upon e vroody, shortly-branched rootstock, but 

 under cultivation develoi^ing short branches up to 2-3 inches 

 long with age. C-rowtlas I-I4 (or under cultivetion up to l|-) inch 

 long, and 5-7 lines thick, or stouter under cultivation, oblio^uely 

 ovoid or cylindric-ovoid, or, under cultivation, oblong-ovoid, 

 obtusely rounded and often slightly compressed and more or less 

 keeled at the apex, with the fissure usually at or just below 

 the middle of perfectly developed growths, v/hich much resemble a 

 shark's head in aripearance, silvery-white or greyish -white, from 

 a dense pubescence of minute simple hairs pointing dov/nv/ards and 

 closely pressed to the surface, as presented by S'ig. 64, C, ^ 

 greptly magnified. 5'ior^er not seen, but, according to the descri- 

 ption and figure, the calyx-lobes are about 2 lines long, deltoid- 

 ovpte, acute, and the petals about 5 lines long, narrowly lines r, 

 nale rurr^le. Fruiting pedicels 6-9 lines long, pubescent, with 

 , deflexed hairs like the' growths; capsule about 3 lines in diameter, 

 5-valved, whitish. — G. argenteum, N.E.Br, in ^ard. ^hron. , 1921, 

 V. 70, r. 273, f. 121. K. pubescens, Hav/. Obs. p. 138 (l794) 

 and Hev. n. 104; He^-i in (^ertenflora, 1910, p. 13-14, t. 1579bis; 

 Berger, Hesemb. v. 230 and 229, f. 48; I»'ierloth in Trans. ^. -^i-fr. 

 Phii. 3oc. V. 18, p. 44. 



Lpdysmith Div. , near Ladysmith, iillens, I'^arloth 3300, 

 Pole Svans 6932. 



The plant figured and described as G. ardent eum is so differ- 

 ent in appearance from the figure of G. pubescens in the Gcrten- 

 flora, as m^y be seen by comn^ring the grovfths represented by 

 A and 3 in Fig. 64, that I had no suspicion that they could be the 

 seme species until I found upon looking up the literature of this 

 species that both came from the same locality, and then suspected 



