18 



SPORES AND THALLIDIA. 



becomes a sporangium. The increase in weight of the sporangium causes the 

 filiform stalk to bend; the sporangium bursts, and the spores, together with the 

 clear fluid in which they are suspended, issue through the rent in the sporangium 

 (c/.fig. 193>). 



In the Moulds of the family of the Mucorini the sporangia are for the most part 



Fig. 163.— Moulds. 



' Mjwor Hncedo; x40. a Longitudinal Bcction o{ a sperangium of Jfiicor Jfuwdo; x260. > Fruit-formation in Jfucor ii/ucerfo; 

 xlSO. * Aspergillus niger; x30. « Longitudinal section of a sporopliore of .^sper(7i7iu« Jli^er. ^ Fructification of Pc7itcii- 

 lium crustaceum (after Brefeld). ' Fruit-formation in Aspergillus (after Eidam). > PenicUUum cruslaceum; x 40. 

 9 Sporopliore of Penicilliuni crustaceum; x200. 



closely crowded together, but they are never walled in by a tissue or surrounded 

 by any particular envelope. They are, moreover, always separate, and have the 

 appearance of a miniature plantation. A different state of affairs is found in that 

 group of Fungi known as the Ascomycetes, a group which includes, amongst well- 



