median 



Megrftroliidiuni 



embryo into lateral halves ; ~ zygo- 

 morph'ous, capable of di-.-ision into 

 similar halves by a piano passing 

 through the middle ; cf. sagittal 

 Section ; Mediananisophyriy (+ 

 Ani30PH^lly), the form of leaves 

 on median shoots, as seen v,dien the 

 twigs are normally decussate. 



Medica'gophyll {Medicago, Tourn. ; -f 

 phyll), the characteristic chloro- 

 phyll of Lucerne, Mcdicago sativa, 

 Linn. 



medifix'us {nicdius, middle ; fixus, 

 fastened), fixed by the middle ; 

 Mediocor'te2(4-CoiiTEx),tlie central 

 layer or layers of tlie bark, usually 

 characterized by inert refractive 

 funeral masses (Grooni) ; Med'ioform 

 ( +"Form), an intermediate form 

 not due to liybridity (Kuntze) ; 

 Medioloc'oform {loacs, a place), a 

 local Medioform (Kuntze). 



mediterra'neua (Lat., midland), (1) 

 inhabiting spots far from the sea ; 

 (2) occmTing in the Mediterranean 



region. 



{incdius, middle 

 from, 



arising 



or 



valva, 

 on tlie 



valves. 



medivarvis 



a valve), 

 middle of tlit 

 Medulla (Lat., pith, marrow) ; (1) tlie 

 pith ; (2) the central looser portion 

 of the llesh in certain Fungi ; (3) the 

 "Mattulla" of palms (Stomionth)*; 

 '-' Se'miaist, the albumen of seeds ; 

 medui'lary, medulla' ns (Lat., seated 

 in the marrow), relating to the 

 pith, pithy ; -- Bun'dles, the more 

 lateral vascular bundles of the leaf- 

 trace in Monocotyledons ; '-' Casts, 

 impressions of the internal cavity 

 of Calaniites in solid material ; '-' 

 conjunc'tiv© Tis'sue = Pith ; - 

 Crown, = -^ Sheath ; ~ Phlo'em 

 Bun'dles, independent phloem 

 bundles developed just witliin the 

 ring of normal vascular bundles ; -^ 

 Hays, plates of parenchyma or 

 cellular tissue radiating from the 

 •pith to the cortex; the "silver- 

 grain" of joiners ; -^ Sheath, trach- 

 eids forming a circle round the pith, 

 the primary xylem bundles project- 

 ing into the pith from the cambium- 



99 



ring ; '^ Spot, an accmiiulation of 

 parenchymatous cells in certain 

 woods, as Alnus (De Bary) ; '^ 

 Sys'tem, sometimes used for the 

 whole ground tissue, but more 

 properly the pith and medullary 

 rays only ; meduU'ated, possessing 

 i)ith ; Medulla'tion (1) the fact of 

 possessing pith ; (2) the special 

 system of the pith ; (3) the forma- 

 tion of the central tissue of a stele ; 

 Medul'lin, the cellulose from pith of 

 the sun-fiower and lilac (Bracounot) ; 

 Medulli'na (Lat.) = Pith; medul- 

 lo'sus (l^t., marrowy), having the 

 texture of pith, 

 megaceph'alus (m«7«s. large; K€<pa\^, 

 head), used of large capituia of 

 Compositae ; Megachlor'oplast (-f 

 Chloroplast), compound chloro- 

 phyll granules in Tillandsia, com- 

 posed of MiCROCHLOROPLABTS 



(Billings) ; Megaconid'ea, pi. 

 Megacon'ids {kSvis, ashes), Zukal's 

 term for the large conidia borne in 

 pycnidia of certain Ascomycetes ; 

 Megagam'etes (yafxir-ris , a spouse), 

 the larger motile sexual cells of 

 Algae, presumably female ; adj. 

 megagam'etaL 



Megalogonid'ium {fj-eydhos, large ; -f 

 GoN'iDiuM) = Macrogonidium. 



Megaphan'erophytes, pi. (/j-eyas, large ; 

 -\- Phanerophyte), trees exceeding 

 the height of 30 metres ; Mega- 

 phyl'lidae (<^uAAov, a leaf), the 

 Ferns, as possessing broad fronds; 

 megaphyrioas, the leaves or leaf-like 

 expansions large (Jeffrey) ; Mega- 

 phyll'y (^vAAov, aleaf), the possession 

 of large leaves; Megaplank'ton (-}- 

 Plankton), distinct from ordinary 

 plankton by inclusion of mega- 

 phytes and Algae of special gi'oups 

 (Wanning) ; Megaplanogam'ete (-f 

 Planogamete), Brebner's term for 

 a large planogamete, presumably 

 female ; Megaprothairus (-f Pro- 

 thallus), the prothallus producing 

 archegonia ; Megasporang'ium (+ 

 Sporangium), the correct form of 

 MacrospoIiangium ; Megarchid'iiim 

 {apxiSiov, a rudiment), = Nucellus ; 



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