304 MORPHOLOGY OF THE ASPERGILLACE^E. 



FIG. 165. Ascospores of four species of Aspergillus. 



Division" i. Perithecia of A, glaueus resting freely on the substratum (a), a'so 

 development of the perithecium from the Eurotium coil (d, e) ; at /a ripe 

 perithecium wiLh young asci ; 6, isolated asei ; c', ripe spores ; c, the same germinat- 

 ing, (c, &', rf, e,f, after de Bary ; a, &, c', after Wehmer.) Magu. same as Fig. 169. 



Division 2. Sclerotia, with shell, of A. nidulans (it) prepaied in the detached state 

 (6); and section, showing sheath and asci (c) ; d, young asci ; c, spores, o e with 

 germinating tube ; /, swollen hypha of shell, with greatly thickened wall. Magn. 

 same as Fig. 176. (After Eidam.) 



Division 3. Perithecia with shell, A. Itelimii, with separately prepared aci (b), and 

 shell hyphae (c). Magn. of a, about 100; of b and c, 1000. (After Zukal). 



Division 4. A Perithecium detached from the mycelial envelope of A.fumigatus, in 

 section (a) containing asci (as) ; b, isolated ascus ; c and d, spores with epidermal 

 ridge, viewed fi'om above (c) and from the side (d). Magn. same as Fig. 171. 

 (After Grijns). 



therefore very unequal, a proper systematic appreciation of which 

 difference would entail the establishment of different genera, the 

 presence or absence of a separate shell being undoubtedly a generic 

 characteristic. However, as already stated, this must be left out 



