agrestal 
Albumoses 
the field), H. C, Watson’s term for 
the cultivable portion of Great 
Britain ; ~ Region, divided into three 
~ Zones, the super-, mid-, and infer- 
agrarian zoues. 
agrest’al (agrestis, belonging to the 
field) ; (1) Watson’s term for plants 
growing in arable ground; (2) rural 
generally. 
agricult’ural Bot/any (agricultura, 
husbandry), that part of economic 
botany which relates to farm plants. 
Agrostog’raphy (dypworts, grass, ypapi, 
writing), the description of grasses ; 
Agrostol’ogy (\éyos, discourse), the 
botany of grasses. 
agyna’rius + (a, without, yuvy, a 
woman); agyn’icus; (1) said of 
stamens which are free from the 
ovary: (2) pistils wanting, desti- 
tute of pistils ; ag’ynous, monstrous 
flowers with pistils missing. 
Ai’'gret (Fr. Aigrette, tuft of feathers), 
the pappus of Compositae; Eng- 
lished by T. Martyn as E’gret. 
aiophyl'lus (ald, eternity, pvAdov, 
a leafi, evergreen. 
aima, in Greek compounds=blood- 
coloured; properly hema (from 
alua, blood), 
Air-Blad’ders, intercellular spaces in 
some Algae, serving as floats; ~ 
Cavity = ~ CHAMBERS (2); ~ -Cells, ~ 
-Chambers, (1) intercellular spaces 
occurring in aquatic plants, usually 
prismatic in form, (2) the inter- 
cellular space beneath a stoma; ~ 
Passage, = ~-CHAMBER; ~ -Plants, 
epiphytes, as Bromeliads and some 
Orchids; ~Pore,=Stoma; ~Sacs, 
cavities in the pollen-grains of 
Pinus; ~ Vessel, term formerly 
applied to empty tracheids, ete. 
Akene’, Ake’nium, = AcHENE, ACHEN- 
IUM. 
Akine’sis (a, without, xivyois, move- 
ment), increase without the phenom- 
ena of karyokinesis ; A’kinetes, in 
green Algae, single cells whose 
walls thicken and separate from 
the thallus, corresponding to the 
chlamydospores of Fungi; immotile 
reproductive cells, formed without 
true cell-formation, or rejuvene- 
scence. ' 
Ala (Lat. wing), (1) formerly an axil, 
but now obsolete in that sense ; (2) 
a lateral petal of a papilionaceous 
flower ; (3) a membranous expansion 
of any kind, as in the seed of 
Bignoniaceae; (4) employed by 
Wm. Smith for the marginal pro- 
cesses in Surirella; (5) the outer 
segment of the coronal lobes in some 
Asclepiads ; (6) in Mosses, the a’lar 
cells are those at the basal angle 
of a leaf. 
Alabas’trum (Lat. bud), a flower-bud. 
a‘lar, ala’ris (ala, wing), (1) formerly 
used for AXILLARIS; (2)~Cells, cf, 
Ala, (6). 
alate’, ala/tus (Lat. winged), furnished 
with an expansion, as a stem or 
petiole; alatepinna’tus, when the 
common petiole of a pinnate leaf is 
marginally winged. 
alba’tus (Lat.), whitened; Albe’do 
(Lat.) whiteness; Albefac’tion (facio, 
I_ make), blanching; albes’cent, 
albes'cens, becoming white; al’bicant, 
al'bicans, tending to white; 
albid'ulus, al/bidus, _—albin’eus, 
whitish ; Al’binism, a disease from 
absence of normal colouring, dis- 
playing itself as an Albi'no; albi'nus, 
al'pulus (Lat.), somewhat white. 
Albumen (Lat., white of an egg), the 
nutritive material stored within the 
seed, and in many cases surrounding 
the embryo. (Nots. Not to be 
confounded with animal Albumen.) 
Albumin, in plants, the proteids 
which readily coagulate from their 
aqueous solutions by the action of 
heat or acids; Albu’minoids (cldos, 
resemblance), nitrogenous organic 
substances, proteids ; albumino’se, 
albu’minous, albwmino’sus, contain- 
ing albumen, a term restricted to 
seeds ; Albu’minates, nitrogenous 
substances insoluble in water, 
soluble in dilute acids or alkalis, 
e.g., gluten of wheat; Albumo’ses, 
similar to albuminates, but soluble 
in water ; common constituents of 
aleuron. 
