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 1). 



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



Fig. 193.— Moulds. 



' ^"'='"' 5™" f »: ^ *?; ' longitudinal section of a sporangium of Uucor Mucedo- x 260. » Fruit-formation in Uuoor Mucedo- 



X180. ^AspergUlusn^er^ X30 ^ Longitr^iin.l section ot a svoropl^oro ol AspergUlus niger. « FructiflcaW "nTl priS: 



1mm cr„eto««m (after Brefeld) 7 Fniit-format.on in Aspergillus (after Eidam). . PenicaUum crustaceum- x « 



s Sporophore of Pemoilhum crustaceum ; x 200. •">iu.i.t;u//» , x vi. 



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- 



