epiphyllous 
Epitrophy 
petiole and blade are developed ; 
epiphyll’ous, -ws, growing on leaves; 
epiphyllosperm’ous (c7mépya, seed), 
bearing seed or the like on leaf-like 
organs, as the dorsiferous Ferns. 
Epiph’ysis (émgiw, to grow up), pro- 
tuberances round the hilum or for- 
amen of some seeds ; strophioles. 
Ep’iphyte (é7i, upon, ¢urov, a plant), a 
plant which grows on other plants, 
but not parasitically ; an air-plant ; 
epiphy’tal, epiphyt’ic, relating to 
epiphytes ; epiphy’toid (eldos, like), 
used in ~ Par’asites, as Loran- 
thaceae and Santalaceae ; Ep’iphy- 
tism, the condition of epiphytes ; 
epiphyto’tic, used of wide-spreading 
disease in plants, as an epidemic 
(Crozier); Ep’iplasm (m\dcua, 
moulded), protoplasm rich in gly- 
cogen, which remains in the ascus 
after the formation of ascospores ; 
glycogen-mass ; Epipleu’ra (7)\evpd, 
a rib), the outer half of the diatom- 
girdle, belonging to the epitheca ; 
Epipod'ium (mois, rodos, a foot), (1) 
the apical portion of a developing 
phyllopodium or longitudinal axis 
of a leaf; (2)ta form of disk con- 
sisting of glands upon the stipe of 
an ovary ; (3) + the stalk of the 
disk itself (Lindley) ; epipol’yarch 
(rodds, many, apx}, beginning), the 
division of the median protoxylem 
in a triarch stele (Prantl) ; epip’- 
terous, epip'terus (rrepov, a wing), 
winged, especially at the summit. 
Epirrheol’ogy (émippéw, I overflow, 
Aovos, discourse), the effects of 
external agents on living plants. 
epirhi’zous, -zus (érl, upon, fifa, a 
root), growing on roots; as certain 
parasites ; episep’alous(+SzPaLum) 
(1) on the sepals ; (2) standing be- 
fore the sepals; Ep’isperm (o7épya, 
seed), the coat or outer covering 
of the seed, spermoderm, perisperm; 
episperm’icus, exalbuminous; Epi- 
sporang’ium (copa, seed, dyyeiov, 
a vessel), the indusium of Ferns; 
Ep/ispore, Hpispor’ium, an external 
coat or perinium formed from the 
periplasm round the odspore in 
91 
some Fungi and the spores of cer- 
tain of the higher Cryptogams ; 
epispor’ic, connected with the outer 
coat of a spore; epistamina’lis 
(+Sramen), on the stamens, as 
hairs. 
Epist/rophe (ériarpopt), turning about), 
the arrangement of chlorophyll 
granules on the upper and lower 
faces of the cells in diffused light ; 
cf. APOSTROPHE ; adj. epistroph’ic ; 
~ Int’erval, 8S. Moore’s term for 
that range of intensity of sunlight 
needed to produce Epistrophe ; 
Epistrophiza’tion, the condition de- 
scribed ; Epist’‘rophy, Morren’s term 
for the reversion of a monstrous 
form to the normal condition. 
epitet’rarch (éml, upon, + TETRARCH), 
when in a triarch stele, the third 
(median) protoxylem group is 
divided (Prantl); epithall’ine 
(@addos, a young shoot), growing 
on the thallus; Epithall’us, the 
cortical layer of Lichens, by Zukal 
employed for all modifications 
of the cortical hyphae at the 
margin or apex of the thallus, 
which serve as protection to the 
gonidia ; Epithe’ca (@jxy, a case), 
the outer and larger half-frustule 
of Diatoms; adj. epithe’cal; Epi- 
the’cium, the surface of the fructi- 
fying disc in Lichens; Epithe’lium 
(O9\n, a nipple), (1) any distinct 
layer of one or more cells in thick- 
ness which bounds an internal 
cavity ; (2) = EpipERMis. 
Epithe’ma, Ep‘itheme (érl@yua, a 
cover), masses of tissue in meso- 
phyll of leaves, serving as internal 
hydathodes, the cells being usually 
devoid of chlorophyll, as in Cras- 
sula. 
epitri‘arch (é7l, upon, + TRIARCH), 
when in a triarch stele, the third 
(medial) protoxylem group is upper- 
most i.e.ventral(Prantl); Epit/rophy 
(rpopy, food), the condition when 
the growth of the cortex on wood 
is greater on the upper side of 
the organ; or having buds or 
shoots on the upper side (Wiesner); 
