Yeast 
Zoomorphosis 
Yeast, pr. yeest, the minute uni- 
cellular organisms which effect 
alcoholic fermentation in sugary 
liquids ; ~ Bud'ding, giving rise to 
similar yeast-gonidia ; ~ Fun’gus, 
Saccharomyces Cerevisiae, J. Meyer; 
sometimes termed SPROUTING 
Funeus: — Bot‘tom ~, Low ~, 
that which forms at the bottom 
of the vats, ‘‘Unterhefe” of the 
Germans; Up’per ~, or Barm, 
that which floats on the surface, 
the German ‘‘ Oberhefe”’ ; wild ~, 
some undesired form, which gives 
a bitter taste to the wort without 
fermentation. 
Ypomne’ma (ird, under, pévw, I 
remain), Necker’s term for an 
inferior calyx. 
Zan'thophyll = XANTHOPHYLL. 
Ze’in, a proteid existing in maize, 
Zea Mays, Linn. 
Zenot’ropism (zenith, tporn, a 
twining), negative geotropism 
(Fayod) ; adj. zenotrop’ic. 
zeori‘nus, resembling the Lichen 
genus Zeora, Fr. 
Zimome = ZYMOME. 
zig’zag, having short bends or angles 
fron) side to side. 
Zoadu'la, pl. Zoadu’lae (Fr. zoadule), 
Gaillon’s term for ZoosPorE. 
zodioph’ilous ({wWdor, a little animal, 
prréw, I love) =ZOIDIOPHILOUS. 
zoidiog’amus ({wov, an animal, ydos, 
marriage), Engler and Prantl’s 
term when an archegoniate plant 
has ciliated antherozoids ; zoidio- 
ph'ilous (¢iAéw, I love), pollinated 
by the agency of animals ; Zoidio- 
ph‘ilae, plants which are so fertil- 
ized. 
zo'nal ({dévy, a belt or girdle), applied 
to those ‘‘ plant-formations ” by C. 
Macmillan, which exhibit well 
marked radial symmetry as 
though spreading from one centre ; 
zo’nate, marked circularly, as the 
leaves of Pelargonium zonale, 
L’Heérit. ; ~ Tetragonid’ia, those 
formed by transverse divisions ; 
cf. CRUCIATE ; Zone, the connection 
293 
between two valves of a Diatom ; 
the hoop or girdle ; ~ of Distribu’- 
tion, in Great Britain, altitudes of 
plant growth as defined by H. C. 
Watson ; divided into in’fer-, mid-, 
and su’per- ; cf. ReGIon; Zona‘tion, 
the formation of a hollow sphere 
by the nucleus in metaphasis, with 
a film of granulated protoplasm 
which marks the boundary of the 
compound oosphere in Cystopus 
Bliti, De Bary (F. L. Stevens). 
Zo’ocarp ({¢ov, an animal, xapros, 
fruit) = ZoosporE; Zoocecid’ia 
(xnxis, a gall), plant-galls produced 
by animals (Tubeuf); Zoocoe’no- 
cyte (+CoENocyTs), a free-swim- 
ming coenocyte; Zo’ocyst (kioris, 
a bag), a cyst, which, in Mona- 
dineae, gives rise to ciliated or 
amoeboid zoogonidia ; Zoodomat‘ia, 
(Swudriov, « small house), shelters 
formed by a plant for those animals 
which are of benefit to it; Zoo- 
g’amae (ydyuos, marriage), plants 
with motile reproductive elements, 
Cryptogams ; Zo’ogamete (yayérns, 
a spouse), = PLANOGAMETE ; Zoo- 
gamy, applied to plants having 
motile sexual elements, as most 
Cryptogams; Zoogloe’a (yards, 
viscous, clammy), a stage of 
Schizomycetes when they are em- 
bedded in a jelly-like substance ; 
Zoogonan’gia (ydvos, offspring, 
dyyetov, a vessel), certain cells in 
Ctenocladus, which enlarge, become 
pear-shaped, and hibernate, after- 
wards producing planogametes 
(Borzi); Zoogonidan’gium (+ 
GoNIDANGIUM), employed by W. 
West for an organ in certain 
Algae which produces zoospores ; 
Zoogonid’ium (+ GonrpIuM)=Zoo- 
SPORE ; Zo’oid (eldos, resemblance), 
a motile spore or gamete (Hazen) ; 
zooidiog’amous (yduos, marriage), 
used of gametes when at least one 
is actively motile, flagellate, 
ciliate, or amoeboid (Hartog) ; 
Zoomorph’osis (udp¢wors, a shap- 
ing), changes produced in plants 
from the action of animals; used 
