Dou>)tful Species. 



105 PossiT^ly the T?lrnt I described as ''■-. socium (i^ourn. Linn. 

 Soc. "^o-t-. vol. -^5, p. 91 ) may belong to the genus Argyrodermi. , 

 but I heve not yet seen its f lov/ers , end the skin of the leaves 

 does not seem to be of quite the same texture. It is a small 

 species, auickl:/ forming a tuft, '"ith half-cylindric, suberect 

 leaves 3-iO lines long, 5-4^ lines broad, and 2|-4 lines thick, 

 obtusely rounded and faintly keeled at the er^er., v/hitish-green 

 tinted v.-j th rose when ex^^osed to the sun. 



Another r>lant that may also prove to belong to this genus is 

 y. octorhyllum, '^e^r. (Rev,, p. 85, excluding the reference to the 

 ficcure of i'^. testiculare in the Botanical Ivlagazine, t. 1573, and 

 ell varieties), ^'rom Ha worth *s descriptions of this riant vv/hich 

 is as f oil ov's, "Leaves on the living plant 6-8, oblong-ovate, half- 

 terete, more erect than those of ^•-■. testiculare") it is impossible 

 to form a.n opinion of it, especially as he quotes the ^ot, ^'J-eg, 

 fifaire as belonging to it which is most certainly due to some 

 error, I think probably by Havrarth entering the reference by mis- 

 take in th-^ v.Tong place in his manuscript, ^ortunatelj there is 

 a dravdne of it ^reserved at Kew, v;hich is labelled "i-'^. octorhy- 

 llum. Haw., I'fey 7, 1827. Received in 1826 from A. H. Haworth 

 Ssq. This drav/ing, therefore, represents the tyrical plant of 

 HavT-orth, and is all that is really knov/n of it. ■'^'or the only 

 plcnt I have ever seen of it was in the rich collection of Mr. 

 W. Wilson Saunders at Heigate, about the year 1866, v/hen i-r. T. 

 GooT^er called my attention to it and said it vras believed to be 

 a descendant of Haviorth's original plant. T^et plant, to the best 

 o:° my recollection, was the same as in 1873 L found to be repre- 

 sented in the Kew figure. It is a tufted snecies, each grov'th 

 wit^"' three or four T>airs of smooth, v/hitish-green of whitish 

 leaves about 7-12 lines long, 3-4 lines broad, and 2^-Z%- lines 

 thick at the much thickened or dilated apical part, v'hich is twice 

 as thick as at the base, flat on the face, very convex on the 

 back, and keeled at the apical part, ^lowers sessile and yellov;, 

 accordin/^ to H^worth. Loc^Ti+y unknov-'n. N.S.Brown 



(To be continued.) 



I'-esem.bryanthem.um. and some nev; genera senarated from it, 

 Gard.^Chron. HI. 71 : 129. 1922.' 

 (Continued from page 105.) 



G-lbbaeum, Haw, 



129 '^'''er:"" dwarf-tufted succulent plrnts, sometimes v/ith short 

 rrostrate- stems. 3ach growth consisting of tv/o very unequal 

 leaves united into an obliquely'" ovoid, oblong-ovoid, or sub- 

 c-"-lindric bodj'-, v^ith an oblique fissure on one side of it, at 

 or belc" the middle, resembling a closed or slightly open mouth, 

 form-^d b;"- the -"ree prrt of the sraalle-^ leaf being closely rres'^-ed 

 against or sli^-htly separ<-ted from the larger one, v.dth the body 

 often more or less swollen or gibbous below the top of the fissure. 

 Flovrer solitary, redici^late, without bracts, Calyx 6-lobed; 

 two o-^ the lobes longer than the others, acutely keeled, and the 

 keel continued dovm the r^edicel. Corolla rather sxnaill, petals 

 numerous. Stamens numerous, ' erect or spreading. S-(^ignas 6, more 

 or less plumose. Capsule smrll, &-valved end 6-celled; valves 



