196 



COMPENDIUM OF GENERAL BOTANY. 



ductive organs, at least none have so far been observed. It has 



very minute characteristic conidial 



J 

 spores. 



We shall now discuss the 

 numerous fungi which have only 

 asexual reproduction, namely, the 

 Ascomycetes, J3asidiomycetes, Ure- 

 dvnece, and Ustilaginece. The 

 differences in reproduction as ex- 

 pressed in the names of the first 

 two groups are illustrated in Figs, 

 120 and 121. 



FIG. 120 -- Asc ^^ ores ' of Peziza Within the two large groups 

 (After Berthoid and Landois.) Ascomycetes and Bdsiclwmycetes 



there is in each a sub-group without a sporocarp or covering for 

 the spore-bearing tissue; the remaining sub-groups have sporo- 

 carps. In regard to the two genera Polyporus and Agaricus, it 

 is to be observed that they represent the essential differences be- 

 tween the Agaricinei and Polyporei ; the lamellae (gills) in the one 

 and the pores in the other are simply different arrangements of the 



Fig. 121. Fig. 122. 



FIG 121 and FIG. 122. Gills (lamellae) from the lower surface of a toad-stool. 

 a, Moderately enlarged; 6, basidium ^^^^^ magnified.) 122, Lamt 



hyphal tissue especially adapted to give rise to spore-producing 

 basidia. The following terms apply to the reproductive organs of 

 many Basidiomycetes : peridium, gleba, and capillitium. The 

 first'is the covering which encloses the entire spore-bearing tissue 

 of the Gasteromycetes. Gleba is the inner hyphal tissue enclosed 

 ' by the peridium. This hyphal tissue contains pores or chambers; 

 the walls of these pores are called trama, and are lined with 



