Diffasion 



Dimorphism 



without intervening partitions ; (2) 

 mixture of fluids, or dispersion of 

 a fluid thiough a solid or tissue; 

 stafic ~ , in botany, the absorption 

 of gaseous bodies through stomata 

 and diff'usion through tissues ; 

 Diffuslv'ity, the ratio of such 

 diff'usion. 



dig'amous, -us (51s, twice ; ydfios, mar- 

 riage), having the two sexes in the 

 same cluster ; as in Compositae. 



dig'enous (51s, two ; ytvos, off"s{iring), 

 containing both sexes, or produced 

 sexually ; digenet'ic, sexual ; digeno- 

 diff'erent (+ genodifferent), 

 when in a hybrid, the genotypes 

 of the two genodifferent gametes 

 involved, differ on two points 

 (Johannsen) ; Di'gency, the con- 

 dition. 



Digestive-cells, of the mycorrhiza of 

 Neottia : cf. Host-cells ; ~ Glands, 

 structures in the lower portion of 

 the interior of the pitcher of Nepen- 

 thes (Macfarlane) ; ~ Pock'et (or -^ 

 Sac), an investment of the second- 

 ary rootlets, Avhich penetrate the 

 tissues of the primary root till they 

 reach the exterior. 



Dig'italine, an alkaloid contained in 

 iJigitalis jncrpurea, Linn. 



digita'lis [digitus, a finger), a finger 

 length ; dig'itate, digita'tus, fin- 

 gered ; a compound leaf in which all 

 the leaflets are borne on the apex of 

 the petiole, as in the Horse-Chestnut; 

 '-' pin'nate, when the leaflets of a 

 digitate leaf are pinnate ; digita'tely, 

 in a digitate manner ; digitaliform'is 

 [forma, shape), shaped like a finger, 

 as the corolla of the Foxglove ; 

 digitinerv'ius [jiervi-f, a nerve), when 

 the secondary nerves of a leaf diverge 

 from the sunimitof the main petiole, 

 straight riboed ; Dig'itus, a measure 

 of about 3 ins. in length, or 8 cm. 



dig'onous (51s, two ; ywvla, an angle), 

 two-angled, as the stems of some 

 cacti (Crozier) ; Digyn'ia [ywi), a 

 woman), a Linnean class, with a 

 f^ynaeciimi of two pistils ; digyn'ian, 

 dig'ynous, with two separated styles 

 or carpels; dihap'loid [-\- hai^loid), 



the coupling of two haploid nuclei 

 (Bonnet) ; Dihap'lophase [(pdais, an 

 appearance) tlie condition described. 



Di-hybridisa'tion, or Dihy'bridism (5t, 

 two ; + Hybrid) having two pairs 

 of allelomorphs, showing the pro- 

 portions of 9:3:3:1. 



Dikar'yon, cf. Dicaryon. 



dilac'erate, dilacera'tus (Lat.), torn 

 asunder, lacerated. 



Dilamina'tion {dis, apart ; lamina, a 

 thin plate), the separation of a layer 

 from a petal, like or unlike it in 

 form ; chorisis. 



dila'ted, dilaia'tus (Lat., widened), 

 ex|tanding into a blade, as though 

 flattened, like the filaments of (trni- 

 thogalwn ; Dilata'tion, cell-division 

 in the parenchyma of the wood, the 

 pith, and the medullary rays, caus- 

 ing cleavage of the xylem-mass. 



dilep'idus X (51s, two ; AeTrls, KerriSos, 

 scale), consisting of two scales, 



dilu'tus (Lat. thinned), of a pale tint. 



dimer'ic, dim'erous, -rvs (81s, two ; 

 fiephs, a share), with two members 

 in each part or circle ; Dimer'istele 

 (-f Merlstele), two meristeles or 

 vascular bundles (Brebner) ; adj. 

 dimeriste'lic. 



■dimidiate, ditnidia'tus (Lat., halved), 

 (1) halved, as when half an organ is 

 so much smaller than the other, as 

 to seem wanting ; (2) used of the 

 calyptraof Mosses when split on one 

 side by the growth of the theca ; 

 (3) in Lichens applied to the perithe- 

 cial wall when it covers only the upper 

 half of the })erithecium ; dimidia'to- 

 cordatus, when the larger half of a 

 dimidiate leaf is cordate. 



Diminu tion [diminutio, a decrease), 

 siruplification of inflorescence in 

 successive branches ((Juillard). 



Dimonoe'cism (+ Monoecfsm), the 

 condition of two out of three kinds 

 of monoecious flowers, having perfect 

 flowers, and [a) male, [h) ieijiale, or 

 (c) neuter flowers also (KTiuth). 



dimorph'ic, dimorph'ous (51s, twice ; 

 ^op(pT), shape), occurring under two 

 forms ; Dimorph'ism, the state of 

 presenting two forms, as long or 



las 



