636 LECTURE XXIi. 



oophore springs from oophore without the intervention of, 

 first, a sexually produced spore, and secondly, of an asexually 

 produced spore. 



We are now in a position to fully understand what is 

 meant by "apospory" and "vegetative apogamy" respectively. 

 By apospory is meant the development of the oophore from the 

 sporophore without the intervention of an asexually produced 

 spore, in other words, by the substitution of budding for asexual 

 spore-formation. By vegetative apogamy is meant the develop- 

 ment of the sporophore from the oophore without the inter- 

 vention of a sexually produced spore, in other words, the sub- 

 stitution of budding for sexual spore-formation. The difference 

 between vegetative apogamy and that other form of apogamy 

 which we have already distinguished as parthenogenesis now 

 becomes apparent. In parthenogenesis spore-formation takes 

 place, but the spore, instead of being the product of a sexual 

 process, is developed without that process, that is, apogamously ; 

 hence the sporophore is developed from a spore which is the 

 homologue of those which are sexually produced, but which, 

 as a matter of fact, has not been sexually produced : sexual 

 spore-formation is replaced by asexual. 



BIBLIOGRAPHY. 



Strasburger ; Ueber Befruchtung und Zelltheilung, Jena, 1878. 

 Bower; Journ. Linn. Soc., xxi, 1885. 

 Farlow ; Quart. Journ. Micr. Sci., XIV, 1874. 

 de Bary ; Bot. Zeitg., 1878. 

 Sadebeck ; Schenk's Handbuch, I, p. 234, 1879. 

 Rostafinski and Woronin ; Bot. Zeitg., 1877. 

 Berthold ; Mittheilungen der Zool. Stat. zu Neapel, n, 1881. 

 Falkenberg ; Mittheil. der Zool. Stat. zu Neapel, I, 1876. 

 Solms-Laubach ; Fauna und Flora des Golfes von Neapel, Mono- 

 graphic iv, 1 88 1. 

 Strasburger ; Theorie der Zeugung, Jena, 1884. 



