10 



BAOTERIOLOaY 



A tubular bud pushes out from the enveloping mem- 

 brane of the spore, lengthens by growing at the end, and 

 quickly forms a very freely-branching network of fibres, 



— Mycelium 



Fig. 4. — Penicilium Glaucum. Magnified 400 times. (After Baumgarten.) 



spoken of as mycelium, and possessing special seed-bearing 

 organs called hyphce or thallus, from which the moulds 

 derive the name of Hyphomycetcs. According to the form 

 of the seed-organ they are divided into mucorinece, aspcr- 

 gillinece, penicilliacece, and oidiacccc. 



Hyplie 



Mycelium 



Couidia 



Fig. S.— OlDitiM Lactis. (After Baumgarten.) 



In the mucorinece, or headed moulds, the ends" of the 

 hyphse swell into knobs (columella), around which a seed- 

 capsule, or sporangium, forms. In this the spores develop 

 in such a way as to burst the enveloping epicarp membrane 

 when fully ripe (fig. 2). 



The aspergillinece (knob -moulds) have the knobbed ends 



