Swarm 



symmetry 



Swarm, a number of spores or uni- 

 cellular Algae of similar origin, 

 which remain in company without 

 being united ; cf. Adelphotaxy ; 

 <^ Cell, -^ Spore, a motile naked 

 protoplasmic body, a zoospore ; 

 Swarm'ers, zoospores ; swarm'ing, 

 moving l)y means of cilia, applied 

 to zoospores. 



swim'ming, used vaguely for aquatics 

 which float or have floating leaves ; 

 also restricted to those wholly 

 immersed and free ; -' Appara'tus, 

 in Azolla, three apical episporic 

 spongy masses of tissue, surround- 

 ing a central conical body with an 

 array of fine filaments (Campbell). 



Switch-plants, plants whose leaves 

 are wanting or reduced, with green 

 shoots acting in place of leaves. 



sword-shaped, eusiform. 



sychnocar'pous, -jnis {(tvxv^s, frequent ; 

 Kctp-nhs, fruit), able to produce fruit 

 many times without perishing, as 

 trees and herbaceous perennials. 



Sy'con = Sycoii'ium,orSy'conus(o-i/«o»', 

 fruit of the fig-tree), a nmltiple 

 hollow fruit, as that of the fig. 



Syco'sis {avKoocTis), a skin disease 

 ascribed to species of Microsporon. 



Sygolli'pliytum, Necker's name for 

 Syncollipliy'tum {<ruyKo\\os, glued 

 together ; (pvrhu, a plant), a plant 

 in which the perianth becomes com- 

 bined with the pericarp. 



Syke, (1) Yorkshire vernacular for a 

 rivulet, which drains out of a bog ; 

 (2) tlie bog itself. 



Syl'va, or Sil'va (Lat., a wood), applied 

 to an account of the trees of a 

 district, or a discourse on trees ; 

 syl'van, relating to woods ; sylvat'- 

 icus or silvat'icus, growing amongst 

 trees ; sylves'tral, used by H. C. 

 "Watson for ])lants which grow in 

 woods and shady places ; sylves'tris 

 or silves'tris, growing in woods ; 

 sylves'trine (Crozier), growing in 

 woods; Syl'vula, (1) a plantation; 

 (2) a small Sylva. 



sym, a modification of syn {<tvu), with ; 

 symbas'ic {Bdais, a pedestal), based 

 on several types ; Symbas'is, the 



condition of having several inde- 

 pendent types ; Sym'bion {&ios, life), 

 an organ which lives in a state of 

 Symbiosis ; Sym'biont (Symbio'tes, 

 of Tubeuf), an individual existing in 

 Symbio'sis, the living together of dis- 

 similar organisms, with benefit to one 

 only, or to both ; also styled commen- 

 salism, consortism, individualism, 

 mutualism, nutricism, prototrophy 

 and syntrophism ; antagonis'tic -^ 

 is a struggle between the two organ- 

 isms; conjunc'tive —, where the 

 symbionts are intimately blended 

 so as to form an apparently single 

 body ; contin'gent '^ , when one 

 plant lives in the interior of another 

 for shelter, not parasitism, in Germ. 

 Raumparasitismus ; disjunc'tive '^ , 

 when the association is only tem- 

 porary (Frank) ; mutualis'tic --', 

 when of reciprocal advantage ; sym- 

 bio'tic, relating to symbiosis ; '-' 

 Sap'ropbytism, the condition of a 

 higher plant, as a Phanerogam, in 

 symbiosis with a Fungus (Mac- 

 dougal) ; symbiotroph'ic {rpocp)], 

 food), deriving nourishment by sym- 

 biotic relationship (Kirchner). 

 symmetran'tbus [avfineTpos, commen- 

 surate ; ivdos, a flower), when a 

 perianth is divisible into eipial 

 parts by several planes of division ; 

 symmet'ric, symmet'rical, (1) act- 

 inomorphic ; (2) similar in the 

 number of members in calyx, corolla, 

 and androecium ; symmetricar'pus 

 {Kapirhs, fruit), a fruit which is sym- 

 metric, as first defined ; Sym'metry, 

 Symmet'ria, (1) capable of division 

 into similar halves; (2) "used of 

 topography when it shows uniform 

 changes " (Clements) ; bilat'eral --' , 

 (1) capable of equal division in one 

 plane only; (2) "where the areas 

 occur in two similar rows (Clements) ; 

 ma'jor -', that of an organism, as a 

 whole ; mi'nor -^ , that of part of 

 an organism, as of a flower; multi- 

 lat'eral -- = radial -' ; ra'dial ~, 

 (1) capable of equal division in 

 more than one direction through the 

 centre; (2) "a condition in which 



Ba 



373 



