18 



SPORES AND THALLIDIA. 



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

 fiKform 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. 193.— Moulds. 



'i Mucor Mucedo; x40. ^ Longitudinal section of a sporangium of J/ttco;- Jfwcedo; x260. s Fniit-formation in Mucor Mucedo; 

 xlSO. * Aspergillus niger; x30. ^ Longitudinal section of a sporophore of ^sj^erg'itos »%«/•. « Fructiflcation of PgntciZ- 

 lium cnistaceum (after Brefeld). ? Fruit-formation in Aspergillus (after Eidam). » Penicillium crustaceum ; x 40. 

 9 Sporopliore 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- 



