GLOSSARY 243 



Cellulose. The carbohydrate material of which cell walls are formed. 



Central cylinder. The stele or portion of a root or stem which is inclosed 

 by the primary cortex. 



Chlamydospore (cloaked spore). A thick-walled resting cell or spore. 



Chlorophyll (leaf green). The ordinary green coloring matter of plants 

 held in the chloroplasts, or chromatophores. 



Chlorophyll bodies. Masses of protoplasm (in seed plants usually minute 

 disk-shaped bodies) colored green by chlorophyll, — chloroplasts. 



Chloroplasts (green molded). Chlorophyll bodies; plastids containing 

 chlorophyll. 



Choripetalous (separate petal) .^ Having the petals separate. 



Chorisepalous (separate sepal). Having the sepals separate. 



Chromatin (color). The deeply staining substance contained in the 

 nucleus which forms the chromosomes. 



Chromatbphore (color bearer). Any large green, brown, or red proto- 

 plasmic body, especially characteristic of the cells of algse. 



Chromoplast (color molded). Plastids of other colors than green (as 

 red, brown, yellow, etc.), a term used in contrast to chloroplast. 



Chromosomes (color bodies). Readily Btained bodies within the nucleus, 

 composed of chromatin and appearing most conspicuously during 

 nuclear division. 



Cilium (an eyelash). A vibrating fibril attached to a zoospore or sperm. 



Cladophyll (branch leaf). A branch with the form and functions of a 

 leaf, called also a cladode and phylloclade. 



Class. A taxonomic group composed of orders. 



Cleistogamous (closed marriage). A term applied to fertilization occur- 

 ring in unopened flowers. 



Closed bundle. A fibro-vascular bundle which contains no cambium 

 and is consequently incapable of further growth. 



Coenocyte (a vessel in common). A multinucleate cell, "generally of 

 large size. 



Coenogamete (a gamete in common). A multinucleate gamete, gen- 

 erally of large size. 



Collenchyma. Parenchyma cells with walls thickened, usually at the 

 angles. 



Columella, plu. columellm (a small column). The persistent axis of cer- 

 tain spore cases and spore fruits. 



Companion cell. An elongated cell associated with a sieve tube. 



Conceptacle. A pit-like cavity in the rockweeds containing the sexual 

 organs. 



Cone. The scaly fruit of such conifers as the pines, spruces, etc., also 

 of the lycopods and horsetails, — a strobilus. 



Conidiophore (conidia bearer). A generally upright stalk upon which 

 conidia are borne, 



Conidium (dust). An asexual spore of a fungus, generally formed in the 

 air. 



Coniferous. Cone tearing. 



