92 



PROTOZOA 



determine the rupture of the fruit-wall and the scattering of the 

 spores. 



Again, in some cases the plasmodia themselves aggregate in 

 tile same wav as the arnoeboids do in the Acmsicac, and combine 



Fig. oO. — Didyiiiiani diffonne. A, two sporangia [sp(j 1 and 2) ou a fragment of leaf (/) ; 

 B, section of sporangium, with ruptured outer layer («), aud threads of capillitium 

 (cp) ; C, a llagellula with contractile vacuole (twac) aud nucleus (lut) ; D, the same 

 after loss of tlagelluni ; 6, an ingested bacillus ; E, au amoehula ; F, conjugation of 

 amoebulae to form a small plasmodium ; G, a larger Plasmodium accompanied liy 

 numerous amoebulae ; sp, ingested spores. (After Lister.) 



to form a compound fruit termed an " aethalium," ^ with tlie 

 regions of the separate plasmodia more or less clearly marked off. 

 The species formerly termed Aethalium septicum is now known as 

 Fuligo varians. It is a large and conspicuous species, common on 

 tan, and is a pest in the tanpits. Its aethalia may reach a 



' The name '■ aethalium " is now always used in this sense. 



