ex 



Existent 



forms are considered to have been 

 evolved from simpler ones. 



ex, privative prefix in place of e, 

 when a vowel follows ; exo = out- 

 ward. 



exalbu'minous, exalbumino'sus (ex, 

 priv., + ALBUMEN), destitute of al- 

 bumen, used only of seeds when 

 the embryo occupies the whole 

 cavity within the testa ; ex'alate, 

 excdaftus (alatus, winged), wingless. 



exalta'tus (Lat., raised high), lofty, 

 tall. 



Exanthem'ata (<?, out of, av6os, a 

 flower), blotches on leaves, etc., as 

 though eruptive; Exanth'ium J 

 bractlets of the last degree, in- 

 capable of forming axillary buds, 

 and immediately external to the 

 flower. 



exan'nulate (ex, priv., annulus, a 

 ring), used of Ferns which do not 

 possess an elastic ring round their 

 sporangia ; exapophysa'tus ( + APO- 

 PHYSIS), destitute of an apophysis, 

 or swelling below the capsule of a 

 Moss. 



ex' arch (c, out of, dpx^ o r igi n )> used 

 of vascular bundles in which the 

 whole primary wood is centripetal, 

 almost the same as perixylic. 



exar'eolate, exareola'tus (ex, priv., + 

 AREOLATUS), not spaced out or 

 marked into small areas; exar'il- 

 late (+ ARILLA), without an aril; 

 exar'istate.exaruta'^ws ( + ARISTA), 

 destitute of awns. 



exas'perate, exasperaftus (Lat., rough- 

 ened), rough with hard projecting 

 points. 



ex'cavate (excavatus, hollowed out), 

 as though dug out. 



excen'tric, excentric'us (er, out of, 

 centrum, the centre), one-sided, 

 out of the centre, abaxial. 



Ex'ciple, Ex'cipule (Crozier), Excip'- 

 ulum, Excip'ulus (excipula, a basin), 

 wart - like excrescences on the 

 thallus of certain Lichens, which 

 have a narrow opening ; the por- 

 tion of thallus which forms the 

 rim round the base of apothecia. 



Excitability, Excitabil'itas (excitatus, 



roused), the faculty of responding 

 to external stimuli. 



exeres'cent (excrescens, growing out), 

 growing in an unnatural way, as a 

 wart or other outgrowth ; Excres'- 

 cence, a gnaur or wart on the stem 

 of a tree ; enation. 



Excre'tion (ex, out of, cretus, sifted), 

 (1) the action by which any sub- 

 stance is rejected from the organ- 

 ism ; (2) the thing itself excreted, 

 as gum, resin, honey, etc.; excur'- 

 rent, excur'rens (Lat., running), (1) 

 running through to the apex and 

 beyond as a mucro ; (2) where the 

 stem remains central, the other 

 parts being regularly disposed 

 round it; ^ Vena'tion, in Ferns, 

 when the veinlet is directed out- 

 wards. 



exendosperm'ous (e, out, evdov, with- 

 in, <rW/>/*a, seed), used of seeds 

 which have reserve material stored 

 in the embryo. 



exe'sus J (Lat., eaten away), applied 

 to a surface irregularly sculptured 

 as though by corrosion. 



exfo'liate (ex, from, folium, a leaf), to 

 come away in scales or flakes, as 

 the bark of the Plane; Exfolia'- 

 tion, peeling off. 



exhalant (exhalo, I exhale), breathing 

 out, as exhalan'tia Va'sat imaginary 

 vessels in the epidermis, actually 

 the sides of confluent cells ; Ex- 

 hala'tion, the function discharged 

 by stomata in passing off vapour. 



exig'uous, exig'uus (Lat., scanty), 

 small and narrow, mean. 



exi'lis (Lat. ), thin, meagre ; lank and 

 straight. 



exim'ius (Lat., distinguished), ex- 

 cellent for size for beauty. 



exindu'siate, exindusia'tus (ex, priv., 

 + INDUSIATE), without an indu- 

 sium, the membrane which covers 

 the torus in Ferns. 



Ex'ine = EXTINE. 



Ex'intine (ex, out, + INTINE), the 

 middle coat of a pollen-grain, that 

 which is next the intine. 



Ex'istem (e, out, icrros, a web), the 

 " Aussenschicht " of Sanio, consist- 



95 



