384 MOULDS AND YEASTS 



colourless oval ascospores 7 to i o ^ long and 5 to 8 ^ 

 broad : later they become brown. 



The ascigerous or perithecial stage of the fungus is 

 known as Eurotium herbariorum, Link. 



(ii) A. flavus, Link., when fully developed, is a 

 yellowish or tawny-coloured fungus. It occurs on 

 bread, dried plants, and various organic substances, and 

 is found as a saprophyte in the human ear sometimes. 



The apical inflated part of the conidiophore measures 

 30 to 40/0, across : the conidia are round, minutely 

 warted, yellowish, and 5 to 7 /x in diameter. It grows 

 best at about 37 C. 



(iii) Aspergillus niger, Van Tieghem, is a common 

 mould with dark brown or black globose heads of 

 conidia. The hyphae are colourless, or practically so, 

 but the conidia are a smoky-brown tint, round, and 3 to 

 5 AC, in diameter. The inflated end of the conidiophore 

 is about 80 & across, and bears a large number of deli- 

 cate branched sterigmata, on which latter account the 

 fungus is more correctly included in the genus Sterig- 

 matocystis under the name 6". niger, Cramer. 



(iv) A. Oryzae, Cohn, is utilized in Japan for the pre- 

 paration of Sake, a kind of wine made from rice. 



Ex. 168. Procure a specimen of Aspergillus glaucus and 

 examine it both with low and high power according to the 

 method described in Ex. 165. 



Note the shape and arrangement of the conidia : compare with 

 Penicillium glaucum. 



Make drawing of the conidiophore, its inflated apex, and the 

 conidia, and measure the diameter of each. 



3. Cladosporium herbarum, Link. One of the dark- 

 coloured saprophytic moulds met with everywhere upon 



