ON EMBRYONIC FISSION IN PLANTS. 99 
for protecting these embryos from injury during un- 
favourable conditions of the environment. 
When embryonic fission is absent the power of repro- 
duction by spores, as for example among the vascular 
Cryptogams, or by some other method, is especially 
developed instead. 
Nore.—Coleocheta is usually spelt Coleochete, which is however wrong, 
both according to etymology and the British Association rules of nomenclature. 
EXPLANATION OF PLATE. 
I., II. Semi-diagramatic representation of the process of 
embryonic fission in Adogoniwm and Coleocheta. 
Iil., [V. Embryonic gemmation in Spermothamiuwm and 
Hurotwm. 
A. the ovum (oosphere); B. ultimate result of fertilization; 
c. non-motile stage; D. motile stage. 
