meridianus 



Mesophytum 



meridia'nus (Lat. belonging to noon), 

 at mid-day or noon ; towards the 

 south (in northern latitudes) ; 

 meridian, applied by 0. Mueller to 

 the plane in Diatoms which con- 

 tains the pervalvar axis. 



Mer'idisk (ptpos, a part, 5t<r/cos, a disc), 

 term proposed by Clos for any 

 process upon the receptacle apart 

 from the floral organs, whether 

 glandular or not (Crozier); Mer'ism, 

 Bateson's term for the repetition of 

 parts to form a symmetry or 

 pattern. 



merismat'ic (^e/>t0>ia, a share), divid- 

 ing into parts or similar portions ; 

 ~ Tis'sue, formative tissue, cf. 

 MEBISTEM. 



Mer'ispore (ftepos, apart, airopd, seed), 

 the segment of a sporidesm ; Mer 7 - 

 istele (o-T'/jX-rj, a pillar), a portion of 

 the stele of a monostelic stem 

 received by each leaf; meris'tic 

 Variation, see MBRISM. 



Mer'istem (/xepto-ros, divisible), nas- 

 cent tissue, capable of being trans- 

 formed into special forms, as cam- 

 bium, etc. ; Pri'mary ~ , forms the 

 whole tissue of very young organs ; 

 Secondary ~, occurs in organs 

 alongwith permanent tissue,usually 

 in thin layers ; meristemat'ic, 

 pertaining to the Meristem ; meri- 

 stogenet'ic (yeverqs, a begetter), 

 produced by Meristem, actively 

 dividing cell - tissue ; Mer'ithal, 

 Merithal'lus (6a\\os, a young 

 shoot), an internode. 



meroblas'tic (^e'pos, a part, /SXaords, a 

 bud) Embryog'eny, when only a part 

 of the spore is concerned, cf. HOLO- 

 BLASTIC ; Meroconid'ium, pi. Mero- 

 conid'ia, (+ CONIDIUM), conidia 

 which arise from the simultaneous 

 septation of a hypha in Zygomy- 

 cetes, and mature together, while 

 ACROCONIDIA mature in succession 

 from the apex (A. Fischer) ; meros- 

 as a prefix, and its forms -xnerous, 

 merus, as suffixes, denote parts or 

 numbers, as dimerous, etc. 



mes'arch (/*eo-oj, in the middle, &px*l, 

 beginning), applied by Solms-Lau- 



bach to those bundles in which the 

 protoxylem lies in the interior of 

 the primary strand of the wood, 

 thus partly centripetal and partly 

 centrifugal; Mesenter'ica (evrepov, 

 an intestine), "the mycelium of 

 certain Fungals" (Lindley) ; Mes'- 

 istem, contracted from Mesomer'is- 

 tem, the thickening ring of Sanio, 

 a ring of tissue producing the bundle 

 system; Mes'oblast (jSXcto-Tos, a bud), 

 the nucleus ; Mesoblaste'sis, medial 

 growth from Lichen hyphae (Minks); 

 Mes'ocarp, Mesocar'pium (Kaptros, 

 fruit), the middle layer of a 

 pericarp ; Mesocauleorhi'za (/caiAo?, 

 stem, ptfa, root), Gaudichaud's 

 term for "the line of demarcation 

 between the ascending and de- 

 scending systems in his 'Phyta,'" 

 (Lindley) ; Mes'ochil, Mesochil'ium 

 (xeiXos, lip), the intermediate part 

 of the lip of those Orchids which 

 have it separated into three dis- 

 tinct parts ; Mes'ochite (XIT&V, a 

 tunic), the middle layer surround- 

 ing the egg in Fucaceae, composed 

 of cellulose and attached at the 

 base (Farmer) ; Mesocol'la, (ff6XXa, 

 glue), a supposed intermediate layer 

 of the cuticle between the upper 

 and lower surfaces; Mesoder'mis 

 (SepfjLa, skin), the middle layer of 

 tissue in the theca of a Moss ; 

 Mesogonid'ium ( + GONIDIUM), a 

 gonidium which is partially en- 

 veloped in new tissue ; mesogon- 

 im'icus (yovifjios, productive), having 

 the gonidial layer in the centre 

 (Wallroth) ; Mesophlo'em (0Xot6s, 

 bark), the middle, or green bark ; 

 Mes'ophyll, Mesophyl'lum (<f>t\\oi>, a 

 leaf), (1) the interior parenchyma 

 of a leaf, the whole interior ground 

 tissue of the blade ; (2) the de- 

 marcation between leaf and leaf- 

 stalk ; Mes'ophyte (fyvrbv, a plant), 

 Warming's term for those plants 

 which are intermediate between 

 Hydrophytes and Xerophytes ; 

 avoiding both extremes of moist- 

 ure and drought; Mesophy'tum, (1) 

 a name given by Clarion to th< 



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