Stigmarian Rootlets . 
573 
EXPLANATION OF PLATE XXVI. 
Illustrating Professor Weiss’s paper on Stigmarian Rootlets. 
Figs, i, 2, and 3, from photographs taken by Mr. Abraham Flatters. 
Fig. 1. Photograph of a rootlet cut in longitudinal direction from slide, No. 107 
of the ‘ Hick Collection ’ in the Manchester Museum. x 60. i.c. = inner cortex ; 
o.c. = outer cortex ; p. = process from parenchymatous sheath indicating the 
trabecular nature of middle cortex ; tr. = tracheids of vascular branch. 
Fig. 2. Photograph of another rootlet from slide, No. 107 in the c Hick 
Collection.’ x 60. This section is cut rather obliquely so that the right-hand 
portion passes tangentially through the outer cortex. The central cylinder is not 
seen in this section, o.c. — outer cortex; sp.tr. — spiral tracheids of the outer 
cortex. 
Fig. 3. Photograph of a rootlet from slide, No. 75 in the Hick Collection. 
X 30. This rootlet shows the stele connected with the outer cortex by a definite 
strand of parenchymatous tissue. In this parenchymatous strand will be seen 
traces of spiral tracheids cut slightly obliquely. 
Fig. 4. A more enlarged drawing of a portion of Fig. 3 showing, i.c. = inner 
cortical sheath ; px. = protoxylem ; tr\ tr ", tr " = three portions of vascular strands 
running to outer cortex ; sp. tr. = spiral tracheids of outer cortex ; par. — patch of 
large- celled parenchyma of outer cortex. 
Fig. 5. Enlarged drawing of a portion of a longitudinal section of a rootlet from 
slide, No. 401 in the ‘ Cash Collection ' of the Manchester Museum. In this 
rootlet the vascular strand is seen in connexion both with the protoxylem of the 
central cylinder, and also with the spiral tracheids of the outer cortex. Owing to 
compression of rootlet the vascular branch is thrown into a fold ; st. — stele with 
inner cortical sheath i.c . ; tr. b. = trabecular tissue connecting the vascular strand; 
v.br. = branch from original vascular branch ; st. = outer cortex with spiral tracheids 
sp.tr. 
