Root-Hairs 
rotundifolious 
like covering for the smaller cells 
in rear (growing point); ~ Hairs, 
slender outgrowths from the cells 
of the piliferous layer of the newly 
formed portions of roots; ~ Leaf, a 
leaf springing from the base of the 
stem; ~ Parasit’ism, when plants 
are partially parasitic and their 
roots penetrate others, as in Rhin- 
anthus; ~ Poc’ket, the false 
“Cap” in Lemna roots; ~ Pole, 
the seat of new growth when 
the root is detached ; ~ Pres’sure, 
the forcing of fluids into the 
xylem by osmotic force in the 
roots; ~ Sheath = CoLEoR- 
HIZA; ~ Stock = RuHIZOME; ~ 
Tu’bercles, the result of attack by 
Fungi or bacteria, a case of sym- 
biosis, and source of nitrogenous 
nourishment to the host. 
Root, adventit'ious, any not developed 
asa branch of the primary root, but 
from other members; aérial ~, 
used of those which are developed 
above ground, as of epiphytes; 
primary ~, thai developed at the 
opposite pole of the embryo to the 
shoot, the main descending axis. 
root’ing, radicant. 
Root’let, (1) a very slender root, or (2) 
the branch of a root; Root’stock, a 
rhizome. 
rope-shaped, funicular. 
ror‘idus (Lat., bedewed), dewy, 
covered with particles which re- 
semble dew-drops. 
rosa’ceous, -ceus (rosa, + aceous), (1) 
arranged like the five petals of a 
normal rose ; (2) belonging to the 
order of which Rosa is the type ; 
(8) rose-colour, pink. 
rosela’‘tus = (1) ROSULATUS, or (2) 
ROSACEOUS. 
Rosel’la (dim. of rosa)=Rosette’, 
cluster of leaves or other organs in 
a circular form, as Plantago major, 
Linn. ; ~ Shoot, a cluster of leaves 
on a branch from the same point ; 
the Umbili’cal ~ of Diatoms is a 
central star-shaped projection or 
depression of a few larger cells, as 
in Coscinodiscus, 
228 
ros’eolus (Mod. Lat.), pink or pinkish. 
Rose’tum (Lat.), a rose-garden. 
ros’eus (Lat.), rosy, pale-red, pink. 
Ros‘in, crude Resin ; ros’inous (Grew) 
= RESINOUS. 
Ros‘tel= RosTELLUM. 
Ros’tellate, rostella’tus (rostellum, a 
little beak), the diminutive of 
rostrate, somewhat beaked ; Rostel’- 
lum, (1) a small beak ; (2) applied 
by Linnaeus to the caudicle or 
radicle; (3) a narrow extension of 
the upper edge of the stigma of 
certain Orchids, the abortive 
anterior lobe ; ros’trate, rostra’tus, 
with a beak, narrowed into a 
slender tip or point; ros’triform 
(forma, shape), beak - shaped ; 
Ros’trum (Lat., a beak), (1) any 
beak-like extension; (2) the inner 
segment of the coronal lobes in 
Asctepiads. 
Ros‘ula (dim. of rosa), (1) a small 
rose; (2) = Rosette; a collec- 
tion of clustered leaves, as the 
Houseleek; ros’ular, rosular’is, 
ros‘ulate, roswa’tus, collected into 
a rosette. 
Rot, applied to various diseases of 
fungous or bacterial origin. 
rota’ceus ¢ (rota, a wheel, + aceus) 
= rotate’, rota’tus, wheel-shaped, 
circular and flat, applied to a 
gamopetalous corolla with a short 
tube ; ro’tate-plane, wheel-shaped 
and flat, gamopetalous and with- 
out a tube; Rota’tion, Rota’tio, 
the internal circulation of the 
protoplasmic contents of a cell 
cyclosis ; ~ of Gyra'tion, the 
peculiar rotation in Characeae ; 
~ of Pro’toplasm, the movement 
round and within the cell ; rota’to- 
plane = ROTATE-PLANE; ro’tiform, 
rotiform’is t ( forma, shape), wheel- 
shaped, as of a gamopetalous 
corolla with spreading limb and 
a short tube. 
rotund’, rotund’us (Lat., round), 
rounded in outline, somewhat 
orbicular, but a little inclined 
towards oblong; rotunda’tus 
(Lat.), rounded; rotundifo'lious, 
