euscMst 



Evolution 



when a gamete is formed by successive 

 complete divisions from the parent- 

 cell, the gametogonium (Hartog). 

 Eu'stathe J {eva-radris, steadfast), Har- 

 tig's term for the outermost layer of 

 a cell. 

 Eu'fltele (eu, well ; + Stele), Brebner's 

 term for the nionostele of typical 

 dicotyledons, a ringbfmeristeles, in- 

 cluding pericyclic and ground tissue ; 

 the stele of a typical Dicotyledon, 

 with ring of collateral bundles ; adj. 

 enste'lio ; the condition is Euste'ly ; 

 eusporang'iate {aTropa, seed ; ayye'ioy, 

 a vessel), in Pteridophytes, possess- 

 ing a Sf^ orangium, a Eusporan'gium, 

 derived from a group of superticial 

 cells ; Eusporophy'ta(</)i;Tbi', aplant). 

 Cryptogams defined by 0. Mac- 

 Millan as "self-supporting, and do 

 not nurse the gametophytes, r. g. the • 

 higher Mosses, the lower Fern-worts 

 and Club-mosses." 

 Euthariophy tes, Eiith allophy'ta, 



Schroeter's term for Thallophytks 

 exclusive of Myxogastres ; by Wett- 

 stein employed in a more restricted 

 sense for Chlorophyceae and Fungi 

 only. 

 Eutbybas'id {^hehs, direct). Van 

 Tieghem's word for those basidia 

 which spring directly from the 

 sporophore ; cf. Pkobasid ; Euthy- 

 xnorph'osis {iJ.6p(pcc<Tis, a shaping), 

 the rapid succession of members of 

 ditterent form on the same stem, 

 buds, etc., polymorphism (Caruelh 

 eu'thyschist (evehs, immediately ; 

 (rX'0"r^y split), in brood-division, 

 when each nuclear division is accom- 

 jtanied by cell division (Hartog). 

 eutroph'ic (eS. well ; rpocf)^, nourish- 

 ment), applied to plants adapted to 

 live at the expense of nutritive solu- 

 tions present in the soil ; eutrop'ic 

 {Tp6iros, dirc'-tion), (1) A. Gray's 

 word for twining with the sun, that 

 is, left to right, devtrorse ; (2) those 

 flowers Avhich display Eutropy ; 

 Eu'tropy, applied by M'Leod to 

 those flowers to which only a 

 restricted class of specialized insects 

 can giiin access ; adj. eu'tropous. 



evalv'is, evalv'ular {e, priv., valva, 

 leaf of a door), destitute of valves, 

 not opening by them. 



evanes'cent {eranescens, vanishing), 

 soon disappearing, lasting only a 

 short time ; evaniscen ti veno'sus, 

 when the lateral veins of a leaf do 

 not reach the margin. 



Evapora'tion {evaporat'o, vaporizing^, 

 to pass off in vapour ; Evaporim'eter 

 {fiirpov, a measure), an insu-ument 

 to measure the amount of moisture 

 given off by plants. 



Evec'tion [cvectus, carried), when in 

 Cladophora the initial cells of the 

 branfihes arise from the sides of the 

 upper end of the mother-cell ; Evedio 

 dislocctvs is an extreme form of 

 this displacement in C. Nordstdti, 

 Hauck (Brand). 



e'ven, without inequalities of surface ; 

 E'venness, absence of elevations 

 or depressions ; e'ven-pin'nate = 

 ABRUPTLY-PINNATE (Crozier) ; ev'er- 

 green, bearing green foliaiie all the 

 year ; everlast'ing, used of some 

 flowers which preserve their shape 

 and colour in drying, as species of 

 Gnaph'ib'um, Hdichrysicm, etc 



ever'niaeform [f'rma, shape), like the 

 thallus of Evernia, a genus of 

 Lichens ; Ever'nine, a principle 

 found in the same genus ; ever'nioid 

 {clSos, resemblance), like the genus 

 Evernia (Leighton). 



Ever'sion {eversio, an overthrowing), 

 protusions of organs from a cavity, 

 turned backwar»l or outward ; 

 evert'ed, turned inside out. 



ev'ident {evidens, manifest), clearly 

 visible. 



evit'tate, evitta'tus (e, priv. ; vitta, a 

 fillet), not having ViiTAE, oil- 

 reservoirs in the fruit of Umbelli- 

 ferae. 

 e'volute {evolvo, I roll forth), unfolded, 

 turned back ; Evolu'tion, (1) the 

 act of development ; (2) the theory 

 according to which complex forms 

 are considered to have been evolved 

 from simpler ones; sal'tatory -^ , 

 sudden appearance of sports ; mu- 

 tation 



138 



