The Roots of Ranunculacee. . 99 
beneath its upward projecting layers, but ending as a distinct 
layer at about 1™" from the tip of the central cylinder, repre- 
sented at @ inthe figure. Here the layer loses its epidermal 
character and divides to merge into the tissues of the root 
cap, as in the first type, the cortex of several rows of cells 
could be traced as distinct layers to within about 5" of the 
tip of the central cylinder where they divided irregularly and 
appeared to coalesce with the epidermal? and root cap tissues 
of this region, as shownat 4 in the figure, the central cylinder 
as bounded by the endodermis was distinct to within a small 
fraction of a millimeter from the tip, where its rows of cells 
ended as distinct rows and its tissues merge into those of the 
cortex, as shown at 7 in the figure. Thus we see that all the 
tissues run together at the vegetative point and the initial 
§roup is a common one. 
ay Te type I also include : Anemone Virginiana and 
pe toile ene Actea alba, A. spicata var. rubra, Hepatica 
desis. 7: Sti Cimicifuga racemosa, Hydrastis Gana- 
meds fe — laxus, fg halictrum dioicum, and perhaps Ra- 
lifes “gi entrionalts, though in this latter case the plerome 
ones face aimost appeared to be distinct, and if so it be- 
Wale Tinie as 
fof the si aye abe these three types, of meristem structure 
there “at oo my examination has shown me 
but the no hard and fast lines circumscribing these types 
re are all : ; 
Ranuncul, gradations between the structure as found in 
aie 2 ips as far as I have been able to find, who 
© meristem of any of the Ranunculace@, and 
the few spec; 
3 ; ec : ‘ 
s country. they stadied were mainly those not found in 
Pw Ome : 
tain Rictions of Species taken for study, I was unable to ob- 
; —. © vegetative point that showed the meristem 
tirely on this as in most of the roots studied stained differently and — 
ti €Tent app 
Sarance, and could easily .be distinguished from e 
