GLOSSARY 319 
meridian, used chiefly as a synonym for apparent noon; also an imaginary 
line of longitude. 
mesad (é003, middle), a mesophyte; mesophilous, growing in moist soils; 
mesophyll, the leaf of a mesophyte; mesophyte, a plant of moist soils; 
mesophyti’um, a mesophytic formation; mesosta’tic (crarixds, stand- 
ing), completing the succession under mesophytic conditions; mesotro’ pic 
(tpomxos, turning), applied to successions which become mesophytic. 
«meter (érpov, measure), combining term for instrument. 
micti’um (yixrov, mixture), a mixed formation. 
migrant, a plant that is migrating or invading. 
migration (mzgvatio, removal), the movement of plants into new areas; mi- 
gration circle, a circle employed to measure migration. 
mobile, able to be moved, i. e., modified for migration. 
monochronic (pcvos, single, xpovos, time), arising but once; monogenesis 
(yéeors, origin), the origin of a new form at a single place or time; 
monophyle’sis (@iAov, race), origin from a single ancestral type; mono- 
to’pic (Toros, place), arising at one place only. 
motile, able to move by growth, by means of cilia, etc. 
mutable, able to produce mutants; mutant, a form arising by mutation; mu- 
tation, the sudden appearance of new forms. 
namati’um (vdya, aros, brook), a brook formation; namatad, a brook plant. 
nomi’um (voucs, pasture), a pasture formation; nomad, a pasture plant. 
occupation, possession of the ground by plants. 
oceani‘um (dxeayos, ocean), an ocean formation; oceanad, an ocean plant; 
oceanophyte, an ocean plant; oceanophilous, ocean-dwelling. 
ocheti’um (dyerés, drain), a succession due to artificial drainage. 
ochroleucus, yellowish white. 
ochthi‘um (éy$y, bank), a bank formation; ochthad, a bank plant. 
oligope'lic (dAcyos, little, ryAos, clay), containing little clay; oligopsam’mic 
(Wdppos, sand), containing little sand. 
olisthi’‘um (éAi060s, slip), a succession in a landslip. 
ombrometer (d4pos, a rainstorm), a rain gauge. 
-on (-dv, locative suffix), suffix used to denote a family. 
oncospore (éyxos, hook), a plant with hooked disseminules, 
orgadi‘um (épyds, d8os, meadowland partially wooded), an open woodland 
formation; orgadad, an open woodland plant. 
orophyti’um (épos, mounta‘n), a subalpine plant formation. 
oxodi’um (d#8ys, sour), a humus marsh formation; oxodad, a plant of a 
humus marsh. 
