GLOSSARY. 



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Coleoptile. — The first plumular leaf in Monocotyledons, en- 

 sheathing the young succeeding leaves. 



Collateral (of axillary buds). — Occurring side by side in the 

 transverse plane. 



Columella. — The central axis of sterile tissue in the capsule of 

 Bryophytes. 



C oner e scent. — Grown together to form a single structure. 

 Congenital. — Occurring before birth. 

 Cotyledon. — The seed-leaf. 



Cresting. — The many- graded forking of an organ, or of its 

 divisions. 



Crisping. — Copious marginal incision of a leaf. 



Decurrent. — Of a leaf-base which is fused, for some distance 



downward, with the stem. 

 Decussate. — Of successive leaf-pairs alternately inserted at 



right angles. 



Definite variation — A non-fortuitous change in a determinate 



direction. 

 Depauperization. — Impoverishment. 



Dermatogen. — The layer which gives rise to the epidermis. 



Dichotomy. — Apical division of an organ, its main body being- 

 concerned, into two equal or unequal parts of equal rank. 



Dioecious. — Bearing the two kinds of sexual organs on distinct 

 plants. 



Distichous. — Having leaves arranged in two rows (one-half 

 phyllotaxis). 



Dorsiventral. — Relating to an organ with differently-consti- 

 tuted upper and lower surfaces. 



Emargination. — A notching of the leaf-apex. 



Emergence. — An outgrowth from leaf or stem, involving both 

 epidermal and cortical tissues, and which does not, as a 

 rule, develop into a definite organ. 



Enation. — An outgrowth from the surface. 



Endogenous. — Having an embedded origin from the internal 

 tissues. 



Endorhizoid. — A rhizoid springing from the foot of the seta 

 of a moss and growing downwards within the tissue of 

 the gametophyte (= the root of the sporophyte). 



Eutelechy. — Individualising causality (Driesch) ; the regula- 

 tive agent within the cell. 



Epiascidium. — An ascidium whose inner surface is morpho- 

 logically the upper one of the leaf. 



Epicalyx (= calyculus). — The calyx-like structure occurring 

 either immediately below, or intercalated with, the 

 ordinary calyx, but which is of a different morphological 

 nature. 



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