THE GENOTYPICAL RESPONSE OF THE PLANT 345 
different species become crossed. It seems appropriate — for theoretical 
reasons — to denote the total sum of possible combinations in a geno- 
type compound by the term coenospecies'. The ecospecies is then the 
genotype compound narrowed down to the ecological combination-limit. 
The ecological sub-units of the ecospecies distinguished in the 
first part of this work have now to be briefly considered. They 
have been spoken of as types or habitat types. These terms for 
several reasons, and especially because of their vagueness, do not 
seem appropriate. The term »variety» might have been employed. 
-- ----- (renospecies 
-- - - - Genotype and Phenotype 
-- - -— (renophene 
~ 
Big. «19. 
It is obvious, however, that this term gives an inadequate con- 
ception of the result of the genotypical reaction of an ecospecies 
to a specific habitat. It is rather arbitrarely used to denominate 
different kinds of hereditary deviations from a valid or supposed 
type, and cannot therefore be advantageously employed in any 
ecological sense. The term ecotype seems to be an adequate expres- 
sion, and is therefore proposed for the ecological unit, to cover the 
product arising as a result of the genotypical response of an eco- 
species to a particular habitat (cp. Turessox, 1922). 
1 J take the opportunity of thanking Mr. Orro R. HOLMBERG, Conservator of 
the Botanical Museum of Lund, for the coining of this term. 
