Divergence 



Dorsurn 



parts gradually separate as they 

 lengthen, as the follicles in Asclep- 

 ias ; Angle of~, the angle between 

 succeeding organs in the same 

 spiral or whorl ; diver' gent, -ens, 

 diverg'ing, separating by degrees ; 

 diverginer'vius (nervus, a nerve), 

 with radiating main nerves. 



diversiflor'ous, -rus (diversus, contrary, 

 flos, floris, a flower), with flowers 

 of more than one kind ; diver' sus, 

 (1) variable (de Candolle) ; (2) differ- 

 ent or separate. 



Divertic'ulum (Lat., a byeway), in 

 Algae, a protoplasmic protrusion, 

 communicating with the fused 

 procarp cells and the placenta, 

 as in Gracilaria confervoides, Grev. 



divi'ded, divi'sus (parted asunder), 

 used where lobing or segmentation 

 extends to the base ; divisu'ral 

 (line), the line down the teeth of 

 the peristome of a Moss, by which 

 the teeth split. 



Dix'eny (5ls, two, ife^os, a host), where 

 an autoecious parasite may infest 

 two species, but does not need a 

 change of host to ensure its de- 

 velopment (De Bary). 



Dodecagyn'ia (duSeica,, twelve, yvvr/, 

 woman), a Linnean order of plants 

 with twelve pistils ; dodecag'ynous, 

 -nus, possessing twelve pistils or 

 distinct carpels ; dodecam'erous, 

 rus (/uepos, a share), in twelve parts, 

 as in a cycle ; Dodecan'dria (dvjjp, 

 dvdpos, a man), a Linnean class of 

 plants with twelve stamens ; 

 dodecan'drian, dodecan'drous, -drus, 

 of twelve stamens, normally (occa- 

 sionally extended to nineteen) ; 

 dodecapet'alous (wfraKov, a flower- 

 leaf), with twelve petals, or less 

 than twenty ; dodecari'mis (cLppriv, 

 male), Necker's equivalent for 

 dodecandrous. 



Do'drans (Lat., a span), a full span, 

 from thumb tip to extremity of the 

 little finger, about nine inches, or 

 23 cm. ; dodranta'lis, a span long. 



dolabra'tus (Lat.), axed, or axe- 

 shaped ; dolab'riform, dolabriform'is 

 (forma, shaped), hatchet-shaped. 



doleiform'is (dolea, casks, forma, 

 shape), barrel-shaped. 



dolia'rius. dolia'tus (Lat. ), circinate. 



Dolichone'ma (SoXi'xos, long, vijfM, a 

 thread), the stage in nuclear divi- 

 sion which immediately precedes 

 synapsis in the formation of the 

 reproductive cells ; Dolicho'sis, 

 retardation of growth in length 

 (Czapek) ; Dolicho'tmema, (r/j.7j/j.a, 

 free), a filiform cell which ruptures 

 and sets free the gemma of a Moss 

 (Correns). 



Doma'tia (dw^driov, a little house), 

 modified protections for shelter- 

 parasites (Tubeuf). 



domestica'ted, thriving under culti- 

 vation (Crozier). 



dor'mant (dormiens, sleeping), applied 

 to parts which are not in active 

 life, as ~ Buds, <~ Eyes, potential 

 buds which normally do not shoot 

 but are excited to growth by 

 special circumstances ; State, 

 the condition of a plant during 

 the winter, or when inactive from 

 any reason. 



dor'sal, dorsa'lis (dorsum, the back), 

 relating to the back, or attached 

 thereto ; the surface turned away 

 from the axis, which in the case of 

 a leaf is the lower surface (NOTE. 

 This is reversed by some authors) ; 

 ~ Su'ture, the suture of a follicle 

 or legume which is exterior to 

 the axis ; the midrib of a carpel ; 

 dorsicum'bent (cumbens, lying 

 down) = SUPINE (Crozier) ; dorsif- 

 erous (fero, I bear), borne on the 

 back, as the sori on most Ferns ; 

 dor'sifixed, dorsifix'us (fxus), fast), 

 fixed on the back or by the 

 back ; dorsiven'tral (venter, the 

 belly), used of an organ which has 

 dorsal and ventral surfaces, as a 

 leaf ; Dorsiventral'ity, the condition 

 of possessing upper and lower faces 

 of an organ ; Dor' sum (Lat.), (1) the 

 back, or parts of the flower which 

 look to the outside ; (2) in Diatoms, 

 in forms which are more or less 

 lunately curved, the convex side of 

 the girdle. 



81 



