390 THE NON-VASCULAR PLANTS 



e. Classification of True Fungi. — There are three great 

 groups of true fungi, and they all have been illustrated in 

 the forms we have been considering. 



(i) Phycomycetes. — The word means alga fungi. They 

 are so called because they resemble algae in structure, 

 especially alga? like Vaucheria, and they also resemble 

 algae in their manner of sex reproduction. These forms 



Fig. 189. — A cluster cup of the wheat rust on the under surface of a barberry leaf, 

 very highly magnified. The spores produced in it are " late spring spores." 



have no cross walls in their hyphas; they are composed 

 of adenocytes. This group includes all true fungi in whose 

 life histories neither asci nor basidia appear. The bread 

 mold is a member of this group. 



(2) Ascomycetes. — The word means ascus fungi. This 

 group includes all the true fungi which produce asci. You 

 learned of asci in connection with lilac mildew. An ascus 



