heterotactic 
(ADDITIONS) 
Hypnetum 
(Eriksson) ; heterotac’tic (raxrikos, 
qualified to arrange), with more 
than one system in the same in- 
florescence ; Het’erotroph, em- 
ployed by Pfeffer to denote a pure 
saprophyte ; hexacy’clic (kikdos, a 
circle), arranged in six whorls; 
hexaphylet’ic (gvAn, a tribe), 
applied to those derivative hybrids 
which are the product of six forms 
or species, as in some willow- 
hybrids. 
histi’oid (eldos, resemblance), arach- 
noid (Heinig). 
Hof (Germ., a court), (1) the areola 
of a bordered pit; (2) Rosen’s ex- 
pression for a clear, granule-free 
space surrounding the nucleus or 
nucleolus. 
holochlamyd’eous (xAauvs, a cloak), 
employed for ovules such as 
those of Gingko when the integu- 
ments are practically complete 
(Celakovsky). 
homoblas’tic, add (2) used by Goebel 
to express the fact that the larval 
and adult forms are practically 
the same; (3) Pfitzer employs it 
for those Orchids whose pseudo- 
bulbs consist of several internodes, 
only the terminal bearing de- 
veloped leaves; Homodichog’amy 
(+ DicHocamy), the existence of 
homogamous and  dichogamous 
individuals in the same species ; 
homoét’ic, metamorphic, ¢f. Ho- 
MOEOSIS; Homog’amy, add; (2) 
independently coined by G. J. 
Romanes to express ‘‘ discriminate 
isolation ” ; Homogen’esis, Homog’- 
eny, the reverse of HETEROGENESIS ; 
the successive generations resem- 
bling the parent form ; Homon’ymy, 
the possession of the same specific 
name under another genus ; Homo- 
ne’meae (yjua, a thread), formerly 
applied to Algae and Fungi 
(Henslow) ; homotac’tic (raxrixes, 
apt to arrange), when only one 
system of arrangement prevails in 
an inflorescence. 
Hon’ey-leaves, nectaries such as those 
of Aquilegia (Potter). 
Hydras’tin, 
Hor’dein, a special proteid occurring 
in barley, 
Hordeum vulgare, 
Linn. 
husk’less, wanting the usual outer 
covering, as in certain forms of 
barley, walnuts, etc. 
Hy’alosomes (cdua, a body), colour- 
less granules which do not take 
up stains. 
Hyb’ridoform (+ Form), a hybrid be- 
tween Finirorms (Kuntze); Hy- 
bridopro’liform (proles, offspring), 
a fertile hybrid of HysriporoRrms 
(Kuntze). 
an alkaloid found in 
Hydrastis canadensis, Linn. 
Hydrocleistog’amy (+ CLeIsTocGamy), 
when flowers do not open in con- 
sequence of submersion (Knuth) ; 
Hy’drogams (yduos, marriage) = 
CRYPTOGAMS ; Hy’drolyst = Hypro- 
LIST; Hy’drolyte, the substance 
which undergoes fermentation 
(Armstrong) ; Hydromeg’atherm 
(uéya, great, 6épun, heat), Warm- 
ing’s term for a plant which 
needs much heat and moisture, 
as the natives of moist tropical 
regions. 
hydrophylla’ceous, pertaining to Hy- 
drophyllum or its allies. 
Hydroste’reids (crepeds, solid), pro- 
senchymatous thick-walled  ele- 
ments, with conspicuous pits, but 
without spiral thickening on the 
walls (Haberlandt) ; Hydrotax’is 
(raés, order), creeping from dry to 
moist situations, as plasmodia (Ver- 
worn) ; hygroph‘ilous, pertaining 
to Hygrophytes ; hygroph’orous, 
water-bearing, or saturated with 
it ; applied by Spruce to certain 
Hepaticae. 
Hy’phal Bod‘ies, short thick hyphae 
in certain Fungi, which produce 
fructifying hyphae or conidio- 
phores (Thaxter). 
Hyphydrogam’icae (iro, under, vdwp, 
water, duos, marriage), plants 
whose flowers are fertilized under 
water, as Najas (Knuth); Hyphy- 
drog’amy, the condition specified. 
Hypne’tum, a plant-association com- 
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