diaphylioiis 



Diclesium 



from the cavity of the macrospore 

 in Vascular Cryptogams ; dia- 

 pnyl'lous (<pv\\ov, a leaf) = DIA- 

 LYPHYLLOUS ; Diapn'ysis (0i;w, to 

 make grow), proliferation of the 

 inflorescence. 



di'arch (dh, two, &px*), beginning), 

 two protoxylem groups, used of the 

 steles of roots; diari'nus (apptjv, 

 male), Necker's term for dian- 

 drous. 



Di'astase (5td<rra<ns, standing apart), 

 an amylolytic enzyme which con- 

 verts starch into malt-sugar ; ^ 

 of Transloca'tion, attacks starch 

 grains gradually over their whole 

 surface, it is almost universally dis- 

 tributed in plants ; ~ of Secre'tion, 

 acts by corrosion, attacking parts 

 of the starch-grain first ; it is 

 formed by the glandular epithelium 

 of the scutellum of grasses; adj. 

 diastat'lc. 



Di' aster (Sis, two, aar^p, a star) see 

 DYASTEB. 



Diast'ole (SiaoToX?;, separation), the 

 slow dilation of a contractile vesicle ; 

 cf. SYSTOLE. 



Diatherm'ancy (5td, through, depfjuaivu, 

 I warm), the relative conductivity 

 of a medium with regard to the 

 transmission of heat (T. W. Engel- 

 mann). 



diatoma'ceous, resembling or consist- 

 ing of diatoms whose type is Dia- 

 toma ; Diat' online, the colouring 

 matter of Diatoms, phycoxanthine ; 

 Diat'omist, one devoted to the 

 study of Diatoms ; Diat'omphile 

 (0tX^w, I love), an enthusiastic 

 student of Diatoms. 



diatrop ic (5ta, through, rpbiros, twin- 

 ing), used of organs which place 

 themselves transversely to the 

 operating force. 



dibot'ryoid (Sis, double, + botryoid), 

 a compound inflorescence, the 

 branches of the first and succeed- 

 ing orders being botryoid, such as 

 the compound umbel, panicle, or 

 spike. 



Dicar'otin (k, twice, + CAROTIN), a 

 lipochrome pigment ; dicarp'ellary 



s, fruit), composed of two 

 carpels or pistil-leaves. 

 dicha'sial (Stxdfw, I disunite), re- 



lating to a DICHASIUM ; *- Cymes, 

 cymes whose secondary members 

 are dichasia, such as occur in 

 Euphorbiacese ; Dicha'sium, a false 

 dichotomy in which two lateral 

 shoots of nearly equal strength 

 arise from the primary axis below 

 the flower which terminates the 

 apex, the process being repeated 

 by each set of branches ; a two- 

 parted or two-ranged cyme; dich- 

 ast'ic, spontaneously dividing ; 

 dichlamyd'eous (xXayufo, x^u^dos, 

 a cloak), having a double perianth, 

 calyx and corolla; dichoblas'tic 

 (jSXao-r^s, a shoot), suggested by 

 Celakovsky to replace "dichoto- 

 mous" when the repeated dicho- 

 tomy develops into a sympodium ; 

 dichog'amous (5txa, in two, yApos, 

 marriage), hermaphrodite with one 

 sex earlier mature than the other, 

 the stamens and pistils not syn- 

 chronizing ; Dichog'amy, insuring 

 cross-fertilization, by the sexes not 

 being developed simultaneously. 



Dichocarp'ism (5i%oro/i^w, I cut in 

 two, Kapirbs, fruit), Cooke's term 

 for Fungi producing two distinct 

 forms of fructification, dimorphic 

 as to fruit ; dichot'omal, pertaining 

 to a bifurcation, as a ^ Flow'er, one 

 seated in the fork of a dichasium ; 

 dichotomize, to fork or divide in 

 pairs ; dichot'omous, -us, forked, 

 parted by pairs ; ~ Cyme, of English 

 authors = DICHASIUM ; Dichot'omy, 

 the state of being repeatedly forked; 

 - hel'icoid ^, in each successive 

 forking, the branch which continues 

 to develop is on the same side as 

 the previous one, the other branch 

 aborts ; False <~ , = DICHASIUM ; 

 scorp'ioid ~, the branches de- 

 velop on each side alternately ; 

 Dichot'ypy (r^Tros, a type), the oc- 

 currence of two different forms of 

 the same organ on the same stock. 



Dicle'sium (51s, twice, KX^<ris, closing), 

 an achene within a separate and free 



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