GLOSSARY 243 



Pollination. The bringing of pollen to the stigma or ovule. 



Prothallus. The simple sexual individual produced from the 

 spore in Ferns and their allies. 



Receptacle. The end of the flower-stalk, bearing the various 

 organs of the flower. 



Sepals. The leaves of the calyx. 



Sorus. A group of sporangia in a Fern. 



Spermatozoid. An actively moving male cell. 



Spermophyta. The Seed-plants. 



Sporangiophore. An organ specially adapted to bear sporangia. 



Sporangium. A sac or case in which spores are produced. 



Spore. A reproductive body in Cryptogams, usually consisting 

 of a single cell; produced without fertilisation. 



Sporogonium. A spore-bearing fruit, developed from the fer- 

 tilised egg-cell, in Mosses and Liverworts. 



Sporophyll. A leaf bearing one or more sporangia. 



Stamen. The sporophyll which bears the pollen-sacs in Seed- 

 plants. 



Stigma. The part of the pistil which receives the pollen. 



Stipule. An outgrowth from the base of a leaf-stalk. 



Style. The part of the pistil which connects the stigma with 

 the ovary. 



Synagium. A group of sporangia united together. 



Thallus. A plant-body in which stem and leaf are not dis- 

 tinguishable. 



Tracheide. A wood-cell, adapted for conveying or storing 

 water, but not forming part of a vessel. 



Vascular. Possessing, or consisting of, wood and bast. 



Vessel. A row of cells in the wood, fused into a tube for the 

 conveyance of water. 



Whorl. A ring of leaves or other organs, all inserted at the 

 same level on the stem. 



