Survey of Plant Kingdom 127 



sitizing higher plants with the production of such diseases as powdery 

 mildews, and by the production of such plant diseases as blights, etc. 



Certain species reproduce asexually by the formation of conidiospores 

 (ko -nid' i o spor) (Gr. konis, dust; sporos, spore) in which the tips of 



Ascospore 



ParapKuses 



A 



Ascus 

 nucelium 



Huphae 



c 



HumemuTn 





Fig. 40. — Cup fungus (Peziza) of the phylum Eumycophyta, class Ascomy- 

 cetes. A, cup with mycelium for attachment; B, section through the cup show- 

 ing the hymenium; C, enlarged section of the hymenium showing immature and 

 mature asci with ascospores, paraphyses, and hyphae. 



certain hyphae form chains of colored spores (conidia), as in Penicil- 

 lium, Aspergillus, etc. Yeasts commonly reproduce by asexual budding 

 in which a small protuberance is pushed from the cell. The ascomycetes 

 are considered in more detail in a later chapter. 



