M'Nab — On Apospory in the Thallophyta. 469 



Saprolegnese there is apandry where the antheridium fuses with the 

 oogonium, and no androgometes are formed (Achlya, Saprolegnese, 

 Aphanomyces). Those remarkable parasitic Fungi, the Perono- 

 sporese and Saprolegnese, are examples of apospory and apogamy, 

 in its two forms apandry and apogyny. 



It is possible that in such a plant as IJlothrix, where the gametes 

 are similar, and where, as Dodel-Port^ has shown, the gametes may 

 develop directly without conjugating, both apandry and apo- 

 gyny may be present. Indeed the whole subject of reproduction 

 will require to be reconsidered in the light of such discoveries as 

 those of apospory and apogamy. 



Lastly, Professor Bower {Journal Lin. Soc, loc. eit.) mentions 

 the remarkable development of buds in Isoetes as an example of 

 apospory. It appears to me that this process is more closely re- 

 lated to the production of buds in Lycopodium selago. The pro- 

 duction of buds in Lycopodium is a remarkable process admitting 

 of several variations ; and it is at present very difficult to separate 

 apospory from ordinary budding, leaves being so often sporophylla. 



^ Jahrb fiir wiss. Bot. x., 1876. 



