GLOSSARY. 



247 



Ne'e ta ry (nectarium, a depository for 

 nectar}. The place or appendage in 

 which nectar is secreted. 



Nerve (nervus, a nerve). A simple 

 vein or rib. 



Node (nodus, a joint}. That part of a 

 stem which normally bears leaves. 



Nii-ce'1-lus (nucella, a little kerne!). 

 The mass of the ovule within the in- 

 teguments, sometimes called the nu- 

 cleus. 



Nu-rle'-o-lus (diminutive of nucleus). 

 The sharply defined point often seen 

 in the nucleus. 



Nu'-cle-us (nucleus, a kernel). The 

 usually roundish mass found in the 

 protoplasm of most active cells, and 

 differing from the rest of the proto- 

 plasm in its greater density. 



O-o go'-ni-nm. pi. oogouia tiibr, /i 

 f g ' y v *l, offspring). The female or- 

 gan of oophytes. 



O o'ph y-ta iwor, an egg; <vrof, a 

 plant). A primary division of plants, 

 named, from the mode of reproduc- 

 tion, the egg-spore plants. O'-o-phyte 

 is the English equivalent. 



O'-o sphere (woy, an egg ; atfralpa, a 

 sphere}. The naked female egg-cell; 

 the mass of protoplasm prepared for 

 fertilization. 



O'-o-spore (<ioi>, an egg; spore). In 

 general, the egg-cell after fertilization, 

 and surrounded by a cell-wall ; also 

 specially applied tc the spore formed 

 fn an oogonium. 



Open bundle. A fibre-vascular bun- 

 dle \vhich contains cambium. 



O pe'r-cu-lum, pi. opercula (oper- 

 culum, a cover). In mosses, the ter- 

 minal lid of the capsule. 



O'-va-ry (ovarius, an egg-keeper). That 

 part of the pistil which contains the 

 ovules. 



O'-vule (diminutive of ovum, an egg). 

 The body which becomes a seed after 

 fertilization. 



Pa -let ipalea, chajff"). In grasses, the 

 inner bract of the flower. 



Palisade cells. The elongated 



parenchyma cells of a leaf, which 

 stand at right angles to its surface, 

 and are usually confined to the upper 

 part. 



P;i 1-niate (palma, the hand). Radiat- 

 ing like the fingers; said of the veins 

 or divisions of some leaves. 



Pa'n-i-cle (panicula, a tuft). A loose 

 and irregularly branching flower- 

 cluster, as in many grasses. 



Par-a'ph-y-sis, pi. p;ii -;ipli\ < 

 (irapa, beside ; <i>(7is, nature). Sterile 

 bodies, usually hairs, which are found 

 mingled with the reproductive organs 

 of various cryptogams. 



Pa-re'n chy ma (iropcy^c'w, I pour in 

 beside). Ordinary or typical cellular 

 tissue, i.e. of thin-walled, nearly iso- 

 diametnc cells. 



Parthenogenesis ^jrapfln-os. a. 

 virgin; yeyecric, generation). Com- 

 monly applied to the production of 

 seed without fertilization ; but, strict- 

 ly, the formation of a sexual spore 

 without fertilization. 



Pe'd-1 eel (pediculus, a little foot). 

 The stalk upon which an organ is 

 borne. 



Pe du'n-cle (pedunculus, a little foot}. 

 The general flower-stalk. 



Pe'r-1-anth (irepi, around ' : ai-0?, a 

 flouuer). The floral envelopes, or 

 leaves of a flower, taken collectively ; 

 and an analogous envelope of the 

 sporogonia of certain liverworts. 



Pe'r-i-blem (jrepi'/SArj/xa, a covering). 

 A name given to that part of the mer- 

 istem at the growing point of the 

 plant-axis, which lies just beneath the 

 epidermis and develops into the cor- 

 tex. 



Per-i-ca'm-bi nin (irepi, around ; 

 cambium). In roots, the external 

 layer of the fibro-vascular cylin- 

 der. 



Per-i-chae'-ti-um, pi. perichaetia 

 (Trepi, around ; ^ac'rj, kair^ or leaf). 

 In bryophytes, the leaves or leaf-like 

 parts which envelop the clusters of 

 sex-organs, forming in some cases the 

 so-called flower. 



