52 MORPHOLOGY AND CULTURE OF MICROORGANISMS 



So far as evidence has accumulated nearly all the forms met are 

 imperfect. 



FIG. 34. Penicillium expansum, Link, a, b, /, Branching and arrangement of 

 branches of conidial fructification (Xgoo); c, d, e, conidiiferous cells and conidial 

 chains (Xgoo); g, h, j, k, I, sketches of fructifications (Xi4o); m, n, o, germination 

 of conidia (Xgoo); r, s, sketches from photographs showing in s loose aggregations 

 of conidiphores beginning to develop into zonately arranged coremia, in r a 

 coremium i mm. in height. (From Bui. 118, Bureau of Animal Industry, U. S. 

 Dept. Agriculture.} 



Cultural Considerations. Among the numerous species and races 

 are certain green forms which are widely distributed and almost om- 

 nivorous in habit. Other species are closely restricted to particular 



