EUASCOMYCETES 



167 



The forms of the Plectascales to be discussed here fall into six families: 

 the Gymnoascaceae, Aspergillaceae, Onygenaceae, Trichocomaceae, 

 Terfeziaceae and Elaphomycetaceae. The Gymnoascaceae and Asper- 

 gillaceae have simple perithecia, without or with a loose pseudoparenchy- 



Fig. 103. — Amauroascus verrucosus. 1, 2. Fundaments of copulation branches. 

 3, 4. Ascogonium develops parthenogenetically, while nuclei degenerate in antheridium. 

 5. Knot of ascogenous hyphae being surrounded by sterile hyphae. 6. Young perithecium 

 with ascogenous hyphae. 7. Older stage with young asci. ( X 600; after Dangeard, 1907.) 



matous peridium. In the highest representatives of the second family, 

 the perithecia develop to complicated structures which are divided by 

 sterile veins into ascogenous nests. 



The third to sixth family include high forms with complicated and 

 much differentiated fructifications. In the Onygenaceae and Trichoco- 



