resiniferous 
retrogressive 
resin, a resin-duct ; resinif’erous, 
-rus (fero, I hear), secreting resin ; 
Res‘inocyst (xéoris, a bag), hemi- 
spheric structures in the cell-wall 
of the hairs of the stem and leaf of 
Begonia (Schoennett); Resino’sis 
= Restn-Fivx. 
Respira'tion (respiratio, breathing), 
the gaseous interchange between 
the plant and the air in which the 
plant absorbs oxygen, and gives 
off carbon dioxide ; Insula’tion ~, 
the plant gives off oxygen in the 
decomposition of vegetable acids ; 
Inter’nal ~, gives off carbon dio- 
xide, but does not absorb free 
oxygen, as in yeast-fermentation ; 
Nor’mal ~, as defined; Vincula’- 
tion ~, oxygen is absorbed, but no 
carbon dioxide is given off; it 
occurs in the early stages of ger- 
mination of oily seeds (Detmer) ; 
adj. respiratory, as ~ Cavity, ~ 
Cham’ber = Stomatic CHAMBER. 
res'tant (Crozier); res’tans (Lat., 
standing still), persistent. 
Testib’ilis (Lat., restored), perennial. 
resting, in a dormant state; ~ Cell, 
an isolated cell which has passed 
into a quiescent state ; ~Nu’cleus, a 
nucleus not in the act of division ; 
~ Period, the time during which 
dormancy is maintained, the in- 
volution period; ~ Sporan’gium, 
dormant gonidia of such Fungi as 
Saprolegnia, which ultimately give 
rise to swarmspores; ~ Spore, a 
spore with a thick integument, 
needing time before germinating, 
usually passing the winter or dry 
season in a dormant state ; ~ Stage, 
the resting period ; ~ State, quies- 
cence, as of winterspores, or dor- 
mant bulbs. 
resu’pinate, reswpina’tus (Lat., bent 
back), upside down, or apparently 
so, as when the hymenium of a 
Fungus is uppermost. 
Resurrec’tion Plants, those which 
after being dried, when placed in 
water assume their living position, 
as Anastatica and Selaginella lepi- 
dophylla, Spring. 
Retarda'tion, the influence of light 
on growth in certain structures. 
Re’te (Lat., a net), network ; retic’- 
ulate, reticula’tus, netted like net- 
work, as in certain cell-thickening ; 
~ veined, netted veined; reticu- 
la‘ted Ves’sel, one with netted 
thickenings (Crozier); Reticula’- 
tion, network, the regular cross- 
ings of threads ; Retic’ulum (Lat., 
a little net), (1) a membrane of 
cross-fibres found in Palms at the 
base of the petiole; (2) applied 
to the network of linin in the 
nucleus ; retif‘erus + (fero, I bear), 
re'tiform,  retiform'is (forma, 
shape), apparently netted. 
retinacula’tus (Lat.), hooked; Re- 
tina’culum (Lat., a tether), (1) the 
gland to which one or more pollinia 
are attached in Orchids; (2) in 
Asclepiads, a horny elastic body 
to which the pollen-masses are 
fixed, the Corpusculum of Bent- 
ham, Pollen-carrier of N. E. 
Brown, Translator of the Germans ; 
(3) the funicle in most Acanthaceae, 
which is curved like a hook, and 
retains the seed till mature. 
retiner’ved, retiner’vis, retiner’vius 
(rete, a net, nervus, a nerve), net- 
veined. : 
retrac’tus (Lat., drawn back), when 
cotyledons are so far prolonged at 
their base as to completely hide the 
radicle. 
Retort’ Cells, special enlarged cuticu- 
lar cells with an apex more or less 
recurved in Sphagnum. 
retrocur’ved, retrocur’ vus, retrocurva’= 
tus (retro, backward, curvus, 
curved), recurved, bent back; 
retrofiex’ed, retroflex'us (Lat.), 
bent back, reflexed ; retrofrac’ted, 
retrofrac'tus (Lat.), refracted. 
Retrogres’sion (retrogressus, & 
movement backward), reversion 
or development towards simpler 
ph nere pete retrogres’sive, de- 
cadent in structure; ~ Metamorph’- 
osis, in teratology the occurrence 
of organs of lower grade in place 
of the normal structures, as 
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