rhombeus 
Root-Cap 
granules arising from the effects of 
reagents in cell-contents. 
rhom’beus, rhom’bic, rhom’bicus, 
(f6uBos, atop), shaped like arhomb, 
an equilateral oblique-angled 
figure; rhombifo’lius (folium, a 
leaf), rhomboidal-leafed ; rhombi- 
form’is (forma, shape), rhomb- 
shaped; rhom’boid, rhomboi’deus, 
rhomboi'dal, rhomboida‘lis (eldos, 
resemblance), approaching a rhom- 
bic outline, quadrangular, with the 
lateral angles obtuse. 
rhynchos’porous (pvyxos, a beak, 
oropa, a seed), when the fruit ends 
in a beak. 
Rhytido’ma’(suridwua, a wrinkle), the 
formation of plates of cellular tissue 
within the liber. 
Rib, a primary vein, especially the 
central longitudinal or midrib ; 
ribbed, furnished with prominent 
ribs. 
Ricino’lein, the glyceride of Ricino- 
leic Acid, present in the seeds of 
Ricinus. 
Ric'tus (Lat., the opened mouth), 
the mouth or gorge of a bilabiate 
corolla. 
Ridge, an elevated line on the fruit 
of Umbelliferae; either primary 
or secondary. 
rig’ens (Lat.), stiff, rigid ; riges’cent, 
riyes'cens, having a stiff consis- 
tence. 
right-hand’ed=DEXTRORSE ; ¢f. Ap- 
pendix C. 
rig’id, rig'idus (Lat.), stiff, inflexible ; 
rigid’ulous, somewhat rigid. 
Rima (Lat., a cleft), (1) a chink or 
cleft ; (2) the ostiole of certain 
Fungi (Lindley) ; rima’tus, + (Mod. 
Lat.), rimose; ri’miform (forma, 
shape), shaped like a cleft; ri’mose, 
rimosus, ri‘mous, with chinks or 
cracks, as old bark; rimulo’sus 
+ (Mod. Lat.), a diminutive of ri- 
mose. 
Rind, (1) the outer bark of a tree, all 
the tissue outside the cambium ; 
(2) sometimes restricted to the 
tissues exterior to the active 
phloém; (3) the outer layer or 
cortex of Fungi; (4) in Lichens 
the Stra’tum cortica'‘le, also styled 
Rind-lay’er. 
Ring, see ANNULUS for the various 
senses in which it is used; ~ Bark, 
the outer bark when disengaged in 
strips or layers (Hartig); ~ Pores, 
vessels in wood when arranged 
in the annual rings, as seen in 
transverse section; ~ Scale, dis- 
ease caused by 7'rametes Pini, Fr. ; 
~ Type, an appearance in nuclear 
division ; Ring’worm, a disease of 
the skin due to Trichophyton 
tonsurans, Malmsten. 
rin’gent, rin'yens (Lat., gaping), 
wide open, gaping, as the mouth of 
a labiate corolla; ringentiflo’‘rus 
(flos, a flower), the receptacle of 
such Compositae as bear ringent 
florets (Henslow); ringentiform’is 
(forma, shape), apparently gaping. 
ripa’rian, ripa‘rious, ripa’rius (Lat., 
frequenting river-banks), growing 
by rivers or streams. 
Ripe, mature, the completion of an 
organ or organism for its allotted 
function ; ri’pening, maturing. 
riva’lis (Lat., pertaining to a brook), 
growing by a brook-side, 
rivularia’ceous, resembling the genus 
Riwularia; rivula’rioid (eldos, re- 
semblance), means the same. 
ri'vose, rivo'sus (? rivus, a stream), 
having sinuate channels (Crozier). 
rivula’ris (rivulus, a rill), geowing by 
watercourses ; rivulose, having 
small sinuate channels (Crozier), 
rizo’mic, an error for RHIZOMATIC, 
Rod - fructifica’tion, special simple 
gonidiophores in Basidiomycetes ; 
Rod'lets, straight rigid bacteria. 
Rogue, a gardenec’s name for a plant 
which does not come true from 
seed, a variation from the type. 
Root, the descending axis, growing in 
the opposite direction from the 
stem, enodosv, mostly developing 
underground, and absorbing mois- 
ture from the soil; ~ Bacil'lus, a 
bacillus which has its station on 
roots, as the nitrifying bacteria ; ~ 
Cap, large cells which form a cap- 
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