THALLOPHYTA— FUNGI 93 



myceliura as oidium cells (page 73). Some of the Basidio- 

 myoetes also produce sclerotia, masses of closely matted hyphffi 

 which may become detached from the mycelium and germinate 

 after a period of quiescence. 



In recent years the investigations of Brefeld and his pupils 

 have led to a different classification of the Fungi, for which 

 there is much to be said. 



The Myxomycetes are taken out of the group and made a 

 separate class, of equal position to the Alg® and Fungi, great 

 stress being laid on their resemblance to the animal Mycetozoa 

 or Bhizopods. 



The Fungi proper are subdivided into three classes, and 

 these into sub -classes as mider: — 

 Class I. Phycomycetes. 

 Sub-Class 1. Zygomycetes. 

 Sub- Class 2. Oomycetes. 

 Class II. Mbsomyoetes. 

 Sub-Class 1. Hemiasci. 

 Sub-Class 2. Hemibasidii. 

 Class III. Mycomyoetbs. 

 Sub-Class 1. Ascomycetes. 

 Series 1. Exoasci. 

 2. Carpoasci. 

 Additional. Ascolichenes. 

 Sub-Class 2. Basidioinycetes. 



Series 1. Proto-basidiomycetes. 

 2. Auto-basidiomycetes. 

 Additional. BasidioUchenes. 

 Additional. Fungi imperfecta 



According to this school these groups can be arranged in the 

 form of a tree, indicating the probable line of descent or succes- 

 sion of forms. The Phycomycetes are held to be the primitive 

 tjrpe and to be descended from sporangia-bearing Chloro- 

 phyceae. 



Phycomycetes 

 _l _ 



I " """ I 



Zygomycetes Oomycetes 



I 



I I 



Hemiasci Hemibasidii . . Mesomycetes. 



I . I. 



Ascomycetes Basidiomycetes . Mycomyaetes. 



