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 

 Iff. fig. 193 '). 



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



Fig. 103. Moulds. 



i Mucor Mucedo; x40. * Longitudinal section of a sporangium of Mucor Mucedo; x260. Fruit-formation in Mucor Mucedo; 

 x!80. * Aspergillus niger; x30. * Longitudinal section of a sporophore of Aspergillus niger. 6 Fructification of Penictt- 

 Hum crustaceum (after Brefeld). ' Fruit-formation in Aspergillus (after Eidam). Penicillium crustaceum ; x 40. 

 Sporophore of Penicillium crustaceum ; x 200. 



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- 



