Sheath 
(SUPPLEMENT) 
sphenophyllaceous 
result is attained; (2) used by 
Clements as shade-loving plants. 
Sheath, add, (3) the lower, longer 
portion of the cell-wall in division 
in Oedogonium (Potter). 
Shield, add, (3) in Coniferae, the 
thick rhomboid extremity of the 
cone-scales (Potter). 
8ib’ling (Sib, bird fanciers’ term for 
in-bred), applied to a pair of plants 
from the ovaries or the pollen of 
the same plant (Pearson) ; Sib’ship, 
the relationship in question. 
Sic’‘kle, = Drepanium (Potter). 
Bieverse’tum, « plant association in 
which Steversia is the predominant 
factor (Clements), 
Silene’tum, an association of Silene 
(Clements). 
silicicole, showing a preference for 
silicious soils. 
Sin’us, (3) the recess between the 
half-cells of Desmidiae. 
sipho’nic, tubular, as applied to a 
DicryostELt. 
Si‘phonostele (+STELE), the central 
vascular cylinder when complete 
as a tube. 
Skaphoplank’ton (cxd¢y, a skiff, + 
PLanxkTon), boat-shaped organisms 
floating as a mass (Forel). 
Ski’ophyte (oxida, shade, gu7rov, a 
plant), a plant which is not adapted 
to full exposure, but prefers 
shade. 
Sing’uliform (sengulus, separate, + 
Form), a plant in which one organ 
varies independently of another 
(Kuntze). 
sipho’neous (cidwy, a tube), applied 
to Algae composed of one or more 
tubes. 
sirosiphona’ceous, allied to Sirosiphon 
(Archer). 
Slime-moulds, a popular term for 
MyxoGastres, otherwise called 
Myxomycetes and Mycetozoa. 
Sobri’niform (sobrinus, a cousin, + 
Form), a VERSIFORM which belongs 
to a Supcrecirorm, as Rubus 
moluccanus, Linn. (Kuntze). 
Sole‘nostele, an amphiphloic vascular 
tube with widely separated leaf- 
356 
gaps; cf. SOLENOSTELIO; Soleno- 
ste’ly, is the condition. 
sor’al, relating to a SORUS. 
Sorid‘ium, Hicks’s variant of Sorz- 
DIUM. 
Sor’ophore (popéw), I bear), a gela- 
tinous cushion on the ventral edge 
of the sporocarp of MaRsILEa. 
So’rus-canals, cavities in the young 
Pporenel of certain Pteridophytes 
(Campbell). 
Spang’les, used by J. E. Smith for 
PATELLULAE. 
Spar’sioplasts (mAacrds, moulded), 
ELAIOPLaSstTs, variable in position 
and numbers (Mereschkowsky). 
Spartine’tum, a plant association 
made up of Spartina (Ganong). 
Speirostich’ies (o7lyos, a row), a 
spiral series (Hance). 
Sperm, Sperm-cell (p. 249), a minute, 
usually active cell, whose function 
is that of fusion with a large 
resting cell (oosphere), to form a 
zygote. 
Sperma’rium, H. Gibson’s term for 
ANTHERIDIUM; Sperm’ary, 
PoLLEN-TUBE;  spermatog’enous 
(yervdw, I beget), productive of 
the male element; spermato- 
phyt‘ic, relating to seed-bearing 
plants ; spermatoplas’mic, relating 
to the SPERMATOPLASM. 
Spermat’ostrotes, -ae  (orpwrds, 
spread), plants distributed by 
seeds (Clements). 
Sper’mocarp, the fruit of Characeae 
(Bennett & Murray). 
spermato’genous (yévos, race), pro- 
ducing seed. 
sphae’rioid (eldos, resemblance) 
SPHAERIACEOUS. 
Sphagne’tum, a plant society of 
Sphagnum moss; Sphagnol'ogy 
(Aoyos, discourse), the study of the 
genus; sphagno’sus, used by 
Nilsson to denote a Sphagnum 
undergrowth to a heath. 
sphe/noid (civ, a wedge), wedge- 
shaped solid, cuneate (Heinig). 
sphenophylla’ceous, resembling or 
allied to the extinct order of 
Sphenophyllaceae, 
