BY DR. B. CARRINGTON AND W. H. PEARSON. 1043 



" ISOTACHIS SERRULATA. 



" You find at the base of the adult perianth commonly only one 

 folioluDi involucrale entering, but if you examine the top of the 

 calyx {apex dealbatus Synop. Hep. p. 127 diagnosis), you find 

 it overlaid with such small foliola involucralia, which now have 

 lost their rose hue, and have overgrown the very top of the 

 perianth. The diagnosis should be altei'ed to : " ore contracto 

 denticulato squamulis involucralibus dentatis dealbatis externe 

 accretis obvelato." The perianth consists of 3-5 strata of red cells ; 

 in the bud, when the calyx has little overgrown the pistilla these 

 squamce involucrales intimce are rose-coloured. Things will appear 

 quite clear in the adult perianth, when dissected and seen from 

 inwards. 



" ISOTACHIS LiNDIGIANA, G., n. sp. 



"The top of the calyx on its outside with many small scales 

 grown upon it, which are only fastened at their base. Sectio 

 transveralis perianthii shows 3-7 strata, commonly 4-5, towards 

 the base 6-7 strata ; the outer layer of cells is rose-coloured the 

 other hyaline ; you find small scales of a few cells (6-7) in hairy 

 shape like excrescences on the outer wall and on the inner wall 

 of the perianth. Isotachis madida has hyaline scales just as 

 /. serrulata, on the top of the calyx, which veil the folded apex 

 perianthii. 



" Isotachis haematodes, G. 



" Perianth has 7 strata, os jjerianthii extertie squamulis dentatis 

 accretis obvelattmi ; interne e pagina calycis lacinulcB ciliato- 

 dentatce hie inde oriuntur. Is. armata has also the top of the 

 perianth veiled by hyaline squamulse. In these plants then the 

 torus pistillorum is surrounded by a quantity of small scales, and 

 if the calyx begins to grow up between the torus pistillorum and 

 the squamulae involucrales, it takes some of them upwards upon 

 its outer coat, which are to be found dispersed in different height, 

 commonly 1-3 at the base, and a part on the top, over-growing 

 more or less the real apex perianthii or obvelating it, sometimes 



