Trichoblast 
(SUPPLEMENT) 
Versiform 
succession of plants on eroded soils 
(Clements). 
Trich’oblast, (2) employed by Leavitt 
for specialised cells which give rise 
to root-hairs. 
Trimonoe’cism( + Monorcism), having 
male, female, and perfect flowers 
on the same plant. 
Trip’le Fu’sion, a suggested emenda- 
tion of the term Dovusiy Frrriut- 
ZATION ; tripo’lar (+ POLAR), having 
three poles, 
tris’tis, (2) flowering only at night 
(Heinig). 
Troph’ime, the result of the fusion of 
the central nucleus of the embryo- 
sac, the mesocyst, with the second 
antherozoid (Van Tieghem); tro- 
phoplas’mic (mAdcpua, moulded), 
adj. of TROPHOPLASM ; Troph’osome 
(c@ua, a body), any organ which is 
concerned with supplying nourish- 
ment only; Troph’ospore (+ SPorRz), 
applied to the spores of Diatoms, 
Desmids, Lulbochaete and Coleo- 
chaete (Radlkofer); Trophospor’o- 
some, applied to organs which are 
engaged in nourishing and also in 
reproducing the plant (Potonié), 
Trop’ism, the disposition to respond 
by turning or bending (Copeland). 
tropoph’ilous, the functions of TRoPo- 
PHYTES. 
Trop’ophyll (¢v))op, a leaf), leaves of 
_ shrubs and trees (Potonié). 
Trop’ophyte (durov, a plant), a plant 
which is in turn a Hygrophyte and 
a Xerophyte (Schimper). 
trul‘lifer, trullifor’mis (Lat.), shaped 
like a bricklayer’s trowel. 
trypt‘ic, relating to TRyPsIn, or 
similar enzyme. 
Tube-cell, the cell which gives rise to 
the Pollen-tube. 
Tuberculization, the formation of 
tubers, assumed to be due to the 
attack of a Fungus (Bernard). 
Tunic, (5) employed by Smith for 
Urricie of Carex). 
Twin-bund’le, the double leaf-trace of 
Lyginodendron. 
tycholimnet‘ic (+ LIMNETIC), tycho- 
pelag’ic (+PeLaqic), plankton 
occurring accidentally in oceanic 
regions (Forel). 
tymp’anoid, Berkeley’s term for 
‘resembling the head of a drum,” 
Typhe’tum, a plant association of 
Typha. 
Ty'piform (typus, a type, +Fonrm), 
a constant form, arising either by 
natural selection or by animal 
adaptations ; its existence is fre- 
quently dependent on animals 
(Kuntze). 
Ulto’nian (Uitonia, Ulster), relating 
to the province of Ulster (Praeger). 
uncortica’ted (corticatus, covered 
with bark), destitute or deprived 
of cortex. 
uninu’clear, uninu’cleated (+ NU- 
CLEAR), having no more than one 
nucleus; unipo’lar (+ POLAR), 
with only one pole; uniteg’minous 
(tegmen, @ covering), having one 
coat to the ovule. 
urea’ceus (Mod. Lat.), of a charred 
black colour (Hayne), 
Uredinol’ogist (Adyos, discourse), one 
skilled in the knowledge of para- 
sitic Fungi, Uredo and its allies ; 
Ure'doform (forma, shape), re- 
sembling Uredo in appearance; 
Uredosor’us (+Sorvs), a group of 
uredospores. 
uredosporic (+ SPora), 
UREDOSPORES. 
wrophile (odpov, urine, ¢iAéw, I love), 
expressive of Algae growing on 
soil containing much ammonia 
(Chodat). 
bearing 
Vac’uoles, see PROTEID- VACUOLES. 
valve-view, the Diatom frustule seen 
from the side, the girdle being 
then marginal. 
Veg’etative Divis’ion, 
nuclear division. 
verbena’ceous, allied to or re- 
sembling Verbena. 
Ver’siform (versus, turned towards), 
a form which varies from the 
StzM-rorM in several particulars 
(Kuntze). 
heterotypic 
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