Metaphloem 



Microdiodange 



Metaphlo'em ( + PHLOEM), VanTieg- 

 hem's term for a simultaneous 

 growth of bast - tissue with the 

 METAXYLEM ; Metaphy'ta (farov, 

 a plant), (1) plants which mani- 

 fest sexuality or indicate by ac- 

 cessory characters that in their 

 ancestral lines sexually complete 

 progenitors have occurred ; (2) 

 plants with tissue differentiation ; 

 cf. PROTOPHYTE, adj. metaphy'tic ; 

 Met'aplasm (ir\dafjt.a, moulded), 

 Han stein's term for the proto- 

 plasm which contains the forma- 

 tive or granular material; Met- 

 aplas'tid, used to designate the 

 metaphytic organism (Moore) ; 

 Met'asperm (o-Tre/yia, seed), (1) a 

 sporophyte in which the egg-organ 

 is aborted, and no purely vegeta- 

 tive cells are to be found in either 

 male or female plants ; (2) a syno- 

 nym for Angiosperms ; (3) applied 

 by Boulger for the large-celled 

 secondary prothallium in Sela- 

 ginella, the secondary endosperm 

 in Gymnosperms, and the endo- 

 sperm, originally so-called, formed 

 after fertilisation by the division 

 of the secondary nucleus of the 

 embryo sac in Angiosperms ; 

 metasper'mic, metasper'mous, 

 angiospermous ; Metaspor'ophyte, 

 Macmillan's expression for a Cryp- 

 togam of the highest specialisation, 

 as Selaginella. 



Metas'tasis (^ercCorcKm, a removing), 

 ( 1 ) the sum of the changes undergone 

 by the products of assimilation in 

 the cells ; metabolism ; (2) the 

 shifting of an organ to some usual 

 position (Moquin-Tandon). 



Metax'in (/terAv, between), a proteid, 

 the material of the fibrils of plastids. 



Metaxy'lem (fj-era, beyond, + XYLEM), 

 the centrifugally formed vascular 

 bundles superposed to the liber 

 bundles (Van Tieghem). 



meteoric (Mod. /*erew/>os, in mid air), 

 applied to flowers whose expansion 

 depends upon the weather. 



metis'toid (/^TIS, counsel, elSos, like), 

 composed of differentiated cells, 



each cell being dependent on the 

 other cells of the organism ( Hartog). 



metoe'cious (/wrd, beyond, ol/cos, 

 house), existing on different hosts, 

 heteroecious ; metox'enous (eyos, 

 a host) is a synonym. 



Metrogonidlum (^rrjp, mother, + 

 GONIDIUM) = HETEROCYST. 



Mette'nian Glands, organs peculiar 

 to Plumbagineae which secrete 

 mucilage and sometimes chalk. 



Me'tuloids (metula, a small pyramid, 

 eI5os, like), modified cystidia, en- 

 crusted with lime, which project 

 from the hymenium of Peniophora, 

 giving it a velvety appearance. 



Miasm', Mias'ma (/u'ao>ta, defilement), 

 Naegeli's term for those diseases 

 which are due to microbes. 



Micel'la (L. Lat. from mica, a crumb), 

 an aggregation of molecules in the 

 manner of a pleon, but in larger 

 numbers (Nageli.) ; micel'lar Ag'gre- 

 gate, a combination of Micellae. 



Micran'dre (fUKpos, small, avr)p, avdpos, 

 a man) = DWARF-MALE ; micro-aero- 

 ph'ilous (ar)p, air, 0iXe'w, I love) Bei- 

 jerinck's term for anaerobic, needing 

 but little free oxygen ; Microb'asis 

 (fidvis, a base), a variety of the car- 

 cerule, as in Labiates ; Mi'crobe, pi. 

 Micro'bia (jSios, life), Pasteur's term 

 for such organisms as Schizomycetes, 

 bacteria; adj. microbio'tic ; Micro- 

 cen'trum (centrum, Kevrpov, a sharp 

 point), applied to the granular 

 inclusions in the astrosphere of 

 leucocytes, probably the equiva- 

 lent of Centrosome (Farmer) ; 

 Micrococ'cus, pi. Micrococ'ci (/c6r/cos, 

 a kernel), a genus of bacteria, 

 sometimes used to express mi- 

 crobiotic organisms ; Microcon'id, 

 Microconid'ium (+CONIDIUM), the 

 smaller conidia, when two sizes 

 are produced ; Mi'crocyst (/ct/<ms, a 

 bag), an amoeboid cell which is sur- 

 rounded by a membrane, the rest- 

 ing state of swarm -cells of Myxo- 

 gastres; Mi'croderm (Sepjjia, skin), 

 = MICROBE ; Microdi'odange ( + 

 DIODE, dyyeiov, a vessel), Van 

 Tieghem's term for pollen-sac ; 



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