prosoplastic 
(SUPPLEMENT) 
Pseudocleistogamy 
logic tissues caused hy parasi'es 
as in galls (Trotter) ; adj. proso- 
plast’ic; Prososmotax’is (+Osmo- 
TAXIS), movement of motile 
ee in consequence of the 
influence of fluids ; Prosphototax’is 
(+PxHotoraxis), definite arrange- 
ment as the result of the action 
of light on organisms capable of 
response; Prosthermotax’is (+ 
THERMOTAXIS), movement towards 
warmth of bacteria or zoospores ; 
Prosthigmotax’is = THIGMOTAXIS. 
Pro’teid-Vac’uoles, nuclei of cells of 
the tapetal layer in Gymnosperms 
(Chamberlain) ; Proteol’ysis (Avous. 
a loosing), the breaking up of pro- 
teids by enzymes ; Proteosynthe’sis 
(civOeors, composition), building up 
proteids. 
Prothallogams, Prothallogam’ia 
(yauos, marriage), vascular Crypt- 
ogams; prothal’lial-cells, usually 
two in Cycads, the second of which 
gives rise to the antheridial cell ; 
prothal'line, prothal’loid  (¢ldos, 
resemblance), pertaining to a pro- 
thallus, or resembling one. 
Protochro’mozome (+CHROMOSOME) 
in Hygrocybe, a variable number of 
chromatophile granulations which 
at the end of the prophase, unite 
into two chromosomes (Maire); 
Protodoch’ae (doy, reception), 
primary successions of plants 
(Clements); Protog’amy (ydpos, 
marriage), when gametes combine 
without fusion of the nuclei 
(Dange:rd); Protogonid’ium (+ 
Gon1p1uUM), the first generation of 
a succession of gonidia (A. Braun) ; 
Protohad’‘rome (+ Haproms), 
primary xylem. 
Protomyce lium ( + Mycexivum), 
Eriksson’s term for a plasmic 
mass formed between the cells of 
parasitic fungi as mycelial fila- 
ments or in the intercellular 
spaces; Pro’‘toneme= PRoToNEMA. 
Protophy’tia (¢urév, a plant), applied 
by Clements to initial stages of 
succession in plant growths. 
protoplas’tic, used by Henfrey for 
PROTOPLASMIC ; Protopteridophy’ta 
(+PrERIvopHyTa), a hypothetic 
primitive group of Pteridophytes, 
from which the known orders may 
be supposed to have been derived 
(Bower). 
Pro’tostele (+ STELE) supposed primi- 
tive in structure, and has been 
applied to Hapio- and Actrino- 
StELxEs (Brebner) ; a1j. protoste’lic. 
prototroph’ic (rpopy, food), requiring 
bo organic compounds for nourish- 
ment (Jones); Prototroph’ism is 
the state itself ; Pro’totype (rizos, 
a type), the assumed ancestral 
form, from which the descendants 
have become modified; adj. 
prototyp’ic. 
pruni’nus (Mod. Lat., from prunum, 
a plum), plum-colour (Hayne). 
Psamath’ium (Ydpoos, sea sand), a 
strand formation ; psamathoph’ilus 
(piréw, I love), strand-loving ; 
Psamophy’ta (gvrov, a plant), 
strand-plants (Clements). 
Psammogen'ity (yévos, offspring), 
amouat of sand in the soil, as 
affecting the plants growing 
thereon; Psam’mophile (gAéw, I 
love), a plant affecting light sandy 
soils (F. A. Lees); Psam’mophyte 
(purdv, a plant), a sand-plant, 
confined to sandy habitats, as 
dunes; Psammophy’tia, used by 
Clements for sand or sandstone 
plant formations, 
pseu’do-adven'tive (+ ADVENTIVE) 
Buds, young branches of Lycopods 
which have been arrested at a very 
early stage (Bruchmann) ; pseudo- 
autoi’cous(+ AUTOICOUS), a dioicous 
moss when occasionally autoicous ; 
Pseu’do-bul’bil, (2) a structure 
replacing a sporangium in apospory 
of certain ferns; pseu’do-cal- 
ca/reous, used by F. A. Lees for 
plants growing on clay-slate, etc. ; 
Pseudocamb’ium (+ Cambium), 
Williamson’s term for a meriste- 
matic tissue resembling cambium ; 
Pseudochro’matin (+CHROMATIN) 
= PROcHROMATIN; Pseudocleistog’- 
amy (+ CLzIstogaAMy), when 
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