pronate 
Protalbumose 
duct of tube-germination of a spore, 
which abjoints a few spores unlike 
the mother-spore,and then perishes. 
pro‘nate, ‘‘inclined to grow prostrate” 
(Crozier). 
prone, pro’nus (Lat., leaning forward), 
lying flat, especially the upper face 
downward. 
Pronu’cleus (pro, for, + NucuxEvs), the 
nucleus of a conjugating gamete, 
which on coalescing with another 
pronucleus forms the germ-nucleus. 
Prop, used by Withering for STIPULE. 
propaculiferous (propago, a set or 
layer, fero, I bear), bearing off-sets, 
as Sempervivum; Propa’culum, a 
runner or off-set. 
prop’agative, tending to increase by 
asexually produced growths, as 
gemmae, soredia, etc. 
Propa’gulum (dim. of propago, a set 
or layer), (1) an off-set; (2) in 
Lichens, the powdery organs 
which constitute the Sorgpia; 
Propa’go, pl. Propa’gines, (1) a 
bulblet ; (2) the branch bent down 
for layering. 
propen’dent, propen’'dens (Lat.), rang- 
ing down. 
prop’er, true, or correctly under- 
stood ; ~ Juice, any characteristic 
‘fluid ” of a plant, as the ‘‘ milk” 
of lettuce, etc. 
Properimer’istem (pro, for, + Prrt- 
MERISTEM), a synonym of PERI- 
MERISTEM, 
Proph’asis, pl. Proph’ases (mp0, 
before, dots, an appearance), the 
changes in the mother-nucleus 
previous to division, including the 
formation of the nuclear plate and 
the longitudinal division of the 
chromosomes ; Prophlo’ém (+ 
PHLOEM), (1) PRoTOPHLOEM ; (2) the 
cylinder of elongated cells with 
thickened walls, occurring in the 
seta of some Mosses round the 
protoxylem ; Pro‘phyllum (@U)ov, a 
leaf), the bracteole at the base of 
an individual flower, in German 
“Vorblatt”; prophylla’tus, provided 
with prophylla ; prophyl'loid (eldos, 
resemblance), like prophylla. 
s 
Proph’ysis = ProspHysis. 
Prophy’togams (po, before, purdv, a 
plant, duos, marriage), Focke’s 
proposed name for vascular Cryp- 
togams. 
prop’rius (Lat., special, peculiar), 
partial. 
Proscol’la + (mpos, close to, xéA)a, 
glue), a viscid gland on the upper 
side of the stigma of Orchids, to 
which the pollen-masses become 
attached, the RETINACULUM. 
Prosem'bryum (mpos, near, éuSpvor, 
an embryo), = PERISPERMIUM; 
Prosench’yma (éyxuya, an infusion), 
tissue of lengthened cells with 
tapering ends which overlap ; adj. 
prosenchy matous ; Prosenthe’sis 
(€vOnors, imposition), the quantity 
which determines the divergence 
between two successive whorls in 
a shoot (Pax). 
Pros’physes (pvouat, to grow with), 
‘abortive pistillidia of the muscal 
alliance” (Lindley); Prosoplec- 
tench’yma (+ PLECTENCHYMA), a 
modification of hyphal tissue 
(Lindau). 
Prosporan’gium (po, for; omopd, 
a seed; dyyetov, a vessel), (1) in 
Chytridieae, etc., a vesicular cell 
whose protoplasm passes into an 
outgrowth of itself, the sporangium, 
and then divides into swarm- 
spores; (2) in Phaeosporeae, an 
early formed sporangium, formed 
of a layer of the filament combined 
with an outgrowth (Kuckuck); 
proste’lic (+ STELE), when an axis 
consists of a single concentric 
bundle (Jeffrey). 
Pros'pory (mpuw.os, precocious, omopa, 
a spore), abbreviated from PRoIos- 
PorY, the precocious development 
of spores in certain Algae; 
Pros‘tady (orddios, steady), the 
early fruiting stage described 
above, Ler 
pros’trate, prostra‘tus (Lat., thrown’ 
to the ground), lying flat. 
Pros'typus (mpécrumos, embossed) = 
RaPHE. 
Protal’bumose = PROTO-ALBUMOSE. 
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