Achlamydeous — 3 — Allaesthetic Characters 



Agamete. — An undifferentiated cell used for reproductive 

 purposes, as opposed to a sexually differentiated reproductive 

 cell or gamete. 



Agameon. — A species consisting of only apomictic individuals 

 (Camp & Gilly). 



Agamic, Agamous. — Having no pistils, stamens nor true 

 seeds; reproducing asexually by apomixis, q.v. 



Agamobium. — The asexual generation of an organism having 

 an alternation of generations. 



Agamogenesis. — Asexual reproduction by buds. 



Agamogony. — Reproduction by means of undifferentiated 

 cells (agametes), as occurs in Protista and Thallophyta, as 

 opposed to reproduction by means of sexually differentiated 

 cells (gametes). 



Agamospecies. — Species which lack true sexual reproduc- 

 tion. 



Agamospermy. — Seed production without fertilization. 



"Age and Area". — Willis's hypothesis that, other things 

 being equal, species which have existed longest will occur 

 throughout a greater area than species of more recent origin. 

 Thus the localized distribution of an endemic species is ex- 

 plained on the basis of its not having had time to spread, rather 

 than on the theory that it arose as an adaptation brought 

 about by peculiar local conditions. 



Agnation. — Relationship through the male line. 



Agonisis. — Certation; competition, as between pollen grains 

 of different genotype, in the rapidity with which they can grow 

 down the style. 



Agro-ecotype. — A group of agrotypes all having similar 

 environmental preferences. 



Agrotype. — An agricultural race. 



Akaryote. — A cell lacking a nucleus. 



Akinete. — A resting cell. 



Albinism. — The absence of chlorophyll in a plant, or of pig- 

 mentation in an animal. 



Albino. — An animal lacking pigmentation or a plant lacking 

 chlorophyll. 



Albinotic. — Affected with albinism. 



Alecithal. — Of eggs: having little or no yolk. 



Aleurone. — The peripheral thick walled cells of the endo- 

 sperm of a seed particularly in Gramineae. 



Allaesthetic Characters. — Characters which become effective 

 via the sense organs and brain of other organisms (Huxley). 



