338 



CLASS ASCOMYCETEAE 



Fig. 109. Saccharomycetales, Family Endomycetaceae. (A-D) Eremascus fertilis 

 Stoppel, stages in isogamic sexual reproduction. (E-H) Endomyces magnusii Ludwig, 

 stages in anisogamic sexual reproduction. (After Guilliermond: Ann. fermentations, 

 2:129-151, 257-277.) 



tween this family and the two famihes of yeasts will have to be abolished. 

 (Fig. 109.) 



Attention should be drawn to two filamentous fungi which agree with 

 this order in simplicity of structure and the formation of asci singly and 

 not in a hymenium. Both are parasitic in the hymenium of species of 

 Corticium. In the authors' opinions these are highly derived, simplified 

 forms possibly derived from apothecial genera. They are Trichomonascus 

 (Jackson, 1947) and Myriogonum (Cain, 1948). Their relationship to the 

 filamentous Saccharomycetales is doubtful, but they may be placed here 

 until they have been studied in culture and their full ontogeny observed. 



Family Ascoideaceae. In many respects this family shows relation- 

 ship to the Endomycetaceae, but the differences seem large enough to 

 warrant their being kept distinct. The two genera Dipodascus and 

 Ascoidea form well-developed mycelium. In the former asexual reproduc- 

 tion is by the breaking up of the terminal portion of the hypha from the 

 apex downwards to form oidia in one species and is lacking in the other. 

 In Ascoidea the conidia are produced singly at the tips of the hyphae 

 which by sympodial development grow by the conidium and produce 

 another one until the hypha appears to have one terminal and many 



