Lepidopteron 



An insect in the order Lepidoptera (e.g.) moth. 



Leptophyll 



See Leaf-size classes. 



Lethal Gene 



A gene (q. v.) that causes death of an organism. 



Leucoplast 



A colorless Plastid in which starch often forms, located 

 in the Cytoplasm in plant cells. 



Level Terrace 



A terrace that strictly follows the contour, in contrast to 

 the Graded terrace (q. v.). 



Ley 



An English term for land that is temporarily under grass, 

 legumes, or mixtures of these. 



Liana (Liane) 



A climbing or twining plant. 



Lichen 



A Symbiotic association or relationship of an alga and a 

 fungus, which forms crustose, foliose, or fruticose bodies. 



Liebig's Law of the Minimum 



The generalization that states the growth and reproduc- 

 tion of an organism is dependent on the nutrient substance, 

 such as nitrogen, oxygen, carbon dioxide, that is available 

 in minimum quantity. 



Life Belt 



A vertical subdivision of plant and animal life, deter- 

 mined largely by altitudinal influences, part of a Bio tic 

 province (q. v.). 



Life Cycle 



The phases, changes, or stages an organism passes through 



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