3g(3 PLANT STt'DIES 



Petal: one of the lloral li.'a.ves wliich make ii|i tlie cin'olla. 

 rnoTosYN'TiiEsis : the ]ii'(ieess by wliicli cliloi'oiilasts, aided liy liglit, 



iiiaiuifacture carliohydrates fi-om carbon dioxide and watei'. 

 Pistil: tlie central organ of tljc llower, composed of one or more ear 



pels. 

 Pistillate: ajiplied to flowers with ear|iels lint no stamens. 

 PoLLE.N : the microspores of Spermato[)liytes. 

 PoLLEX-TL'iiE : the tnlie developed from the wall <d' the |)ollcn grain 



which penetrates to the egg and conducts the male cells. 

 PoLLiN'ATiON : the transfer of pollen from anther to ovule (in (iymim- 



spierms) or stigma (in Angiosperms). 

 PoLYi'KTALous : applied to flowers whose petals are free from one an- 



otlier. 

 PiiOTii.u.LU'M : the gametophyte of Ferns. 

 Protonema: the thallus portion of the gameto[jhyte of flosses. 



Uecef'iacle : in Angiosperms that part of Ihe stem which is more or 



less moditii'd to support the parts of the flower, 

 linizoiii: a liair-like process developed by tlie lower [ilants and tiy in- 



di'pcndeiit gainetophytcs to act as a holdfast or absorbing organ, 



or both. 



SaproI'Itvte : a plant which obtains food from the dead bfidies or ijody 

 jirodiiets of pl:iiits or animals. 



Scale: ;i leaf without chloro[ihyll, and usually reduced in size. 



Sepal: one of the floral leaves wliieli make up the calyx. 



Sexeal spoke: one producc<l liy the union of gametes. 



Si'ERM : the mule gamete. 



Spiral: applied to an arrangement of leaves or fhiral parts in which 

 no two appear upon the axis at the same level ; often called alter- 

 nate. 



Si'oRANiiiu.M : the organ within which asexual spores are inoduced 

 (except in Piryophytes). 



.Score: a ei'll set .ap.art (nr repi'uducl ion. 



Si'oRoooxiuii : the leallcss spoi-ophytr nl liryophytcs. 



Si'oKopMoi;i: : :\ special br.'iiich bi'aring asexual spores. 



Si'oRoiMiVLL : ,■! Icafsei, apart to produce spor.-ingia. 



Si'oropiiyte : in altrrnal icm of gener.at ions, t he gencratitai which pro- 

 duces 1 he .-is^'XUal spiires. 



Sta.iiex: llie micnisporo|ihyll ot Sperinalnphylcs. 



Stamlxate : a|iplieil tc ;i Ihjwi'r with sl.auicns bul no carpels. 



Stigma : in Angiosperms that purtioii of the carpel (usually of the style) 



lU-epareii 1,1 receive pnllen. 



