5 o A TEXT-BOOK OF BOTANY. 



a conidiospore is formed (Fig. 27, A; Fig. 28, A). The process 

 of division at the end of the conidiophore continues from below 

 until a chain of conidiospores is formed. The conidiophore fre- 

 quently branches, so that a fan-like series or group of conidia or 



- 

 . 



FIG. 27. Pcnicillium, a green mildew. A, richly branching mycelium with conidio- 

 phores; B, enlarged view of conidiophore showing chains of conidia; G, D, E, F, successive 

 stages in the development of a peiithecium; G, H, J, development of asci; K, groups of 

 asci containing from 4 to 8 ascospures; L, ascospores seen from the side and showing char- 

 acteristic markings. After Brefeld. 



conidiospt'iv- is produced ( Kig. 27, B ; Fig. 28, A ). The conidia 

 are usually -mm- ^hadi- <>f inven, but finally they may become more 

 nr k-ss brown. They arc- thin-walled, quite small, and so light 

 that they float freely in the air. If a colony is inhaled it gives 



