THALLOPHYTA— FUNGI 93 



mycelmm as oidiiim cells (page 73), Some of the Basidio- 

 mycetes also produce sclerotia, masses of closely matted liyphae 

 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. 



Tlie Myxomycetes are taken out of the group and made a 

 separate class, of equal position to the Algae and Fmigi, great 

 stress being laid on their resemblance to the animal Mycetozoa 

 or Rhizopods. 



The Fungi proper are subdivided into three classes, and 

 these into sub-classes as mider : — 



Class I. Phycomycetes. 

 Sub- Class 1. Zygom^'cetes. 

 Sub-Class 2, Oomycetes. 

 Class II. Mesomycetes. 

 Sub -Class 1. Hemiasci. 

 Sub -Class '2. Hemibasidii. 

 Class III. Mycomycetes. 

 Sub-Class 1. Ascomycetes. 

 Series 1. Exoasci. 

 2. Carpoasci. 

 Additional. Aseolichenes. 

 Sub-Class 2. Basidiomycetes. 



Series 1. Proto-basidiomycetes. 

 2. Auto-basidiomycetes. 

 Additional. Basidiohchenes. 

 Additional. Fungi imperfecti. 



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 

 t^-pe and to be descended from sporangia-bearing Chloro- 

 phyceae. 



Phycomycetes 



Zj^gomycetes Oomycetes 



r 



I ' I 



Hemiasci Hemibasidii . . Mesomiicetes. 



I 1 



Ascomycetes Basidiomycetes . Mycomycetes. 



