Phloéoterma 
Phragmitetum 
exogens from the wood (xylem) 
by the cambium; ~ Islands, 
groups of bast-strands surrounded 
by xylem (Chodat); ~ Ray, a ray or 
plate of phloém between two 
medullary rays; ~ Sheath, a layer 
of thin-walled cells surrounding the 
vascular tissue next within the 
cortex, best seen in roots; Phloé- 
oter’ma (répua, a limit), the inner- 
most layer of primary cortex; 
Phloe’um+t, the cortical tissues ; 
Phiorid’zin (pita, « root), a white 
crystalline substance which gives 
the bitter astringency to the root- 
bark of the apple, pear, cherry 
and plum- trees; Phloroglu’cin, a 
body of frequent occurrence in 
the bark of trees, derived from 
glucosides. 
phoenic’eous, phoenic'eus (Late Lat.), 
scarlet ; red with a little of yellow 
added. 
phoeos’ porous = PHAEOSPOROUS. 
Phoran’thium (gopds, bearing, dvos, a 
flower), the receptacle of the capi- 
tulum in Compositae. 
photeol'ic (ws, gwrds, light, alddos, 
moving, motile), used of the sleep 
of plants; pho’tic, exposed to light, 
well-illuminated, as the margins 
of pools, etc.; Photo-aesthe’sia 
(dicOqots, perception), Csapek’s 
term to express the power of an 
organ to respond to the stimulus 
of light ; Photo’bia (Blos, life), pl., 
Tulasne’s term for ectoparasitic 
Fungi; photocleistogam’‘ic (+ CLEIS- 
TOGAMIC), used of flowers which do 
not open in consequence of the 
rapid growth of the outer side 
of the petals, due to Puoro- 
Hyponasty (Hansgirg); Photo- 
epinas’ty ( + Erinasry), epinasty 
induced by the action of light 
(Detmer); photogen’ic (yevvdw, I 
produce), used of bacteria which 
are luminous ; Photohyponas'ty (+ 
Hyvonasty), hyponasty caused by 
the effect of light (Vines) ; photo- 
kine’ tic (ivyTixos, having the power 
of movement), moving in conse- 
quence of the stimulus of light ; 
N 
193 
photometric (uérpov, a measure), 
(1) applied to organisms which turn 
either end to the direction of the 
light-rays ; (2) leaves which assume 
a definite position in light, to obtain 
the most of it, or to screen them- 
selves from too much (Wiesner) ; 
Photol’ysis (Avovs, a loosing), the 
arrangement of chlorophyll granules 
under the stimulus of light, includ- 
ing both apostrophe and epistrophe; 
Photomorph’osis (uéppwors, con- 
figuration), that kind of mechano- 
morphosis which depends upon light 
as the cause ; Photosyn’'tax (cuvratw, 
I put together), the formation of 
complex carbon compounds from 
simple ones under the influence of 
light (Barnes); Photosyn’thesis 
(c¥vOeots, a putting together), a 
proposed emendation of ‘‘photo- 
syntax”; phototac’tie (raxriKxds, 
ques to arrange in order), 
trasburger’s term for taking up a 
definite position with regard to the 
direction of light-rays; phototon’ic 
(révos, tension), the increasing irri- 
tability by the influence of light ; 
Photot’onus, the normal mobile 
condition resulting from the alter- 
nation of day and night ; Photo- 
tax’is (rags, order), the definite 
self - arrangement of organisms 
under the stimulus of light ; Photo- 
trophy (tpop}, food), unequal in- 
crease on one side of an organ, due 
to the incidence of light in relation 
to the parent shoot (Oltmanns) ; 
Photot’ropism (rpor}, a turning), a 
synosym of HELIoTROPISM ; Pho’- 
trum, S. L. Moore’s term for the 
whole scale of illumination affect- 
ing PHoToLysis. 
Phrag’ma, pl. Phrag’mata (¢pdyuo, 
an enclosure), a spurious dissepi- 
ment in fruits; phrag’mifer (fero, 
I bear), phrag’miger, phragmig’erus 
(gero, I bear), divided by partitions; 
Phragmobas'id, Phragmobasid'ia, 
1. (+ Bastp), septate basidia in 
P aalctoaiyouted (Van Tieghem). 
Phragmite’tum, Warming’s term for 
an association of reeds, Phragmites, 
