FUNGI. INTRODUCTORY 



401 



tetraspores, being related either actually to a process of nuclear reduc- 

 tion, or at least holding a position in the cycle following closely upon 

 the period when reduction would occur in a normal cycle where sexual 

 organs are present. 

 The Fungi may then be grouped thus : 



Class. Sub-Class. 



Phycomycetes - \Oomycetes 



(non-septate) [Zygomycetes 



ASCOMYCETES 



(septate ; with asci) 

 Basidiomycetes .... 



(septate ; with basidia) 



Examples. 



Pythuim, Phytophthora. 

 Mucor, Empusa. 

 Sphaerotheca, Euro- 



tium, Peziza. 

 Puccinia, Ustilago 



A gar tens, Boletus, 



Scleroderma. 



A Note on Terminology. 



Propagative cells of Fungi which are produced asexually and externally are 

 usually described as conidia : those produced within a spore-case or sporangium 

 are usually described as spores. The stalks or filaments bearing sporangia or 

 conidia are described as sporangiophores and conidiophores respectively. 

 Some spores may be no more than vegetative organs of reproduction, but 

 others, such as ascospores and basidiospores, follow on a process, or substitute 

 process, of sexual reproduction and occur at a definite point in the nuclear 

 cycle. 



