Sheath 



(SUPPLEMENT) 



sphenophyllaceoua 



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). 

 Sib'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). 

 Sieverse'tum, a plant association in 



which Sieversia is the predominant 



factor (Clements). 

 Bilene'tum, an association of Silent 



(Clements), 

 silic'icple, showing a preference for 



silicious soils. 

 Sin'us, (3) the recess between the 



half -cells of Desmidiae. 

 sipho'nic, tubular, as applied to a 



DlCTYOSTELE. 



Si'phonostele ( + STELE), the central 



vascular cylinder when complete 



as a tube. 

 Skaphoplank'ton (<<</>?7, a skiff, + 



PLANKTON), boat-shaped organisms 



floating as a mass (Forel). 

 Ski'ophyte ((rad, shade, QVTOV, a 



plant), a plant which is not adapted 



to full exposure, but prefers 



shade. 

 Sing'uliform (singidm, separate, + 



FORM), a plant in which one organ 



varies independently of another 



(Kuntze), 

 sipho'neous (<rl<f>wv, a tube), applied 



to Algae composed of one or more 



tubes, 

 sirosiphona'oeous, 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 SUBGREGIFORM, as Rubus 



moluccanus, Linn. (Kuntze). 

 Sole'nostele, an amphiphloic vascular 



tube with widely separated leaf- 



gaps; cf. SOLENOSTELIC ; Soleno- 

 ste'ly, is the condition. 



sor'al, relating to a SORUS. 



Sorid'ium, Hicks's variant of SORE- 

 DIUM. 



Sor'ophore (0o/)ew), I bear), a gela- 

 tinous cushion on the ventral edge 

 of the sporocarp of MARSILEA. 



So'rus-canals, cavities in the young 

 sporangia of certain Pteridophytes 

 (Campbell). 



Spang'les, used by J. E. Smith for 

 PATELLULAE. 



Spar'sioplasts (TrXao-rds, moulded), 

 ELAIOPLASTS, variable in position 

 and numbers (Mereschkowsky). 



Spartine'tum, a plant association 

 made up of Spartina (Ganong). 



Speirostich'ies (oTt'xos, 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 (oo&phere), to form a 

 zygote. 



Sperma'rimn, H. Gibson's term for 

 ANTHERIDIUM ; Spenn'ary, = 

 POLLEN-TUBE ; spermatog'enous 

 (yevvdb), I beget), productive of 

 the male element; spermato- 

 phyt'ic, relating to seed-bearing 

 plants ; spermatoplas'mic, relating 

 to the SPERMATOPLASM. 



Spermat'ostrotes, -ae (o-Tpurbs, 

 spread), plants distributed by 

 seeds (Clements). 



Sper'mocarp, the fruit of Characeae 

 (Bennett & Murray). 



spermato'genous (ytvos, race), pro- 

 ducing seed. 



sphae'rioid (elSos, resemblance) = 



SPHAERIACEOUS. 



Sphagne'tum, a plant society of 

 Sphagnum moss ; Sphagnol'ogy 

 (Xo7os, discourse), the study of the 

 genus; sphagno'sus, used by 

 Nilsson to denote a Sphagnum 

 undergrowth to a heath. 



sphe'noid (<r0V> a we dge), wedge- 

 shaped solid, cuneate (Heinig). 



spttenophylla'ceous, resembling or 

 allied to the extinct order of 

 Sphenophyllaceae. 



356 



