hadrocentric 
(ADDITIONS) 
heterophagous 
hadrocen’tric (centrum, the middle) 
Bun’dle, having the hadrome in the 
centre surrounded by the leptome 
(Haberlandt) ; Had’romase, an 
enzyme found in Merulius lacry- 
mans, Schum., and other Fungi, 
which attacks the hadrome and 
destroys its lignified cell - walls 
(Czapek), 
half-hu’mus Plants, semi-saprophytes. 
halo‘nial, used of the fertile branches 
or tubercles of the fossil Lepido- 
phloios, formerly considered as be- 
longing to Halonia, Lindley et 
Hutt., non Fries. 
Haplan’the (év6, a blossom), Hux- 
ley’s term for the hypothetic 
anemophilous type of the flowers 
of Gentianaceae; cf. Journ. Linn. 
Soc., Bot. xxiv. (1887), 112, 122; 
haplocau‘lous (xavAds, a stem), 
having a simple unbranched stem. 
Hekis'totherm (jxirTos, the smal- 
lest, @épun, heat), a plant which 
needs but little heat, and can 
withstand long periods of dark- 
ness (Warming). 
Heleoplank’ton (é\os, a marsh, + 
Puianxton), the floating vegeta- 
tion of marshes, which over- 
powers the animal plankton ; it 
differs from Potamoplankton by 
less motion of the water (Zimmer). 
helicoid Cells, terminal cells, which 
are usually branched, of /itho- 
phora (Wittrock). 
helminuth’oid (jus, a worm, 
eldos, resemblance), worm-shaped, 
vermiform (Heinig). 
helminthospor oid (eléos,resemblance), 
resembling the genus Helmintho- 
sporium, Pers. 
hemiangiocar’pic, -pous (+ ANGIO- 
CARPIC), when the ascocarp 
(apothecium) is closed at first, but 
opens when approaching ripeness 
and discloses the hymenium of 
crowded sci; hemichimono- 
phiilous (xe, winter, giridw, I 
love), applied by F. Ludwig to 
those plants whose above-ground 
development begins even during 
the prevalence of frost, as Ran- 
unculus Ficaria, Linn.; hemitch- 
lamyd’eous (vAapvs, a cloak), half- 
coated, as ovules when borne on 
an inverted symphyllodium in Coni- 
ferae (Celakovsky) ; Hemicleisto- 
g’amy (+ CLetstocamy), Knuth’s 
term for the condition of plants 
whose flowers open slightly ; 
hemipe’lic (myd0s, clay) rocks 
which yield a moderate amount of 
clay detritus, and the plants 
which affect such localities (Thur- 
mann) ; hemipsam’mic (Wdypos, 
sand), strata which give a mode- 
rately porous detritus, with the 
plants which prefer such places 
(Thurmann) ; Hemiplank’ton (+ 
PuLaNnKTon), the mingled vegeta- 
tion of shallow and deep water 
forms in landlocked pools, etc. 
(A. F. W. Schimper). 
heteroblas'tic, add, (2) used by 
Goebel to express the fact that 
the adult form of a plant is very 
unlike the young or larval form ; 
(3) applied by Pfitzer to those 
Orchids in which the pseudobulbs 
consist of a single swollen inter- 
node; the condition is Hetero- 
plas’ty ; heterocar’pinus, an in- 
ferior, or partially inferior fruit, 
as the acorn; Heterodichog’amy; 
Engler and Prantl’s synonym for 
DIcHOGAMY ; Heterodi’‘ode ( + 
Diopg), a term to include Macro- 
DIODE and MicropiopE (Van Tieg- 
hem) ; Heterodisty’ly, dimorphism, 
as in Primula elatior, Jacq.; Heter- 
otristy’ly, trimorphism, as_ in 
Lythrum Salicaria, Linn.; Heter- 
om’erals, Bessey’s abbreviation for 
the Heteromerae of Bentham and 
Hooker, a series of Gamopetalae ; 
Heteromorph’ism, the hetero- 
morphic condition ; Heterome- 
sog’amy (uécos, intermediate, 
yduos, marriage), when indivi- 
duals vary in the method of 
fertilization, as(a)auto-allogamous, 
(b) homodichogamous, and (c) 
dientomophilous ; heteroph’agous 
(¢ayw, I eat), applied to Fungi 
which attack plants not congeneric 
310 
