THE GENUS ASPERGILLUS. 



readiness and abundance. These are small (about 100-200 /j. in 

 diameter), pale browri-yellovv-coloured at first, afterwards ugly 

 brown capsules with a simple, delicate envelope, and enclosing 

 numerous rounded oval asci. Each ascus contains 5-8 colourless, 

 smooth, ellipsoidal spores, exhibiting a longitudinal furrow and 



P 6 



FIG. 169. Aspergillus glaucus. 



Conidiophores (i, 2), sterigmata (3) and conidia (4). A p rtion of mycelium, with 

 overlying perithecia and aconidiophore (magnified) is shown at 5, whilst 6 gives 

 the natui'al size. Sections of perithec : a are given at 7, with young asci (ns~) and 

 first stage^ of development (Eurotium coil) ; isolated asci (8) and detached spores 

 (9), germinating at c. Approximate magn. of 1-2, 50 ; of 7, 170 ; of 8, 260 ; of 

 gc, 700. (i, 7, 8, 9 (in part) after de Bary, the rest after Wt-hmer.) 



measuring 7-10 jj. long by 5-8 p broad. The spore wall bursts 

 open and ejects the exospore, which germinates to a new mycelium. 

 The gradual development of the perithecia from spirally coiled 

 hyphse need only be briefly mentioned here, having been already 

 described in the majority of botanical works. This proceeds both 

 in the presence and absence of light, and therefore as in the 

 formation of conidia in A. niger, &c. is not hindered by the 

 action of light, as was assumed by ELFVING (I.). The same author's 

 assertion respecting the formation of yeast cells is also dubitable 

 and lacking proof. According to LINDNER (II.) the conidiophores 



