240 THE HYPHOMYCETES 



Asp. Niger. Blackish-brown tufts. Branched sterigmen ; optimum 

 temperature, 34 C. (See Photomicrograph, Fig. 91). 



Asp. Ochraceus. Yellowish-red to dark-yellow tufts. Branched 

 sterigmen. 



Asp. Oryzse. Found on rice ; at first flesh-coloured, later of an 

 ochre-yellow colour ; changes starch and dextrin into sugar. Used in 

 the preparation of the Japanese rice-spirit. 



Asp, Repens. Found on fruits preserved with sugar. Appears at 

 first white, later as greenish tufts, with smooth colourless or greenish 

 spores. 



Asp. Subfuscus. Found on bread. Appears as tufts, yellowish to 

 black in colour. Optimum temperature, 37. Pathogenic. 

 Asp. Albus. Whitish tufts and branched sterigmen. 



Asp. Clavatus. Greenish tufts and club-shaped fruit bearers and 

 small conidia. 



Asp. Plavescens, or Plavus. Found in bread, greenish-brown 

 tufts, and yellowish-brown spores, with rugged surface, small black 

 sclerotien. The optimum temperature for its development is 28 C. 

 The pathogenic properties are the same as the Asp. fumigatus. 



Asp. Fumigatus. Found in the trachea and bronchi of birds, and 

 also on bread ; bluish-green tufts, which later acquire a bluer colour ; 

 very small smooth spores ; optimum temperature, 37 to 40 C. (For Photo- 

 micrograph of this fungus, see Fig. 92.) 



Pathogenesis. When rabbits and dogs are injected intravenously with 

 the spores, death occurs in about twenty-four hours. In all the organs, 

 especially in the substance of the heart and kidneys, the fungi can be 

 detected in small clusters. In man an aspergillimycosis also occurs in 

 the lungs, auditory canal, and on the cornea. 



Asp. Glaucus. Found in fruit, cabbage, and damp wooden walls. 

 Greenish-coloured tufts and round spores with rugged surfaces ; optimum 

 temperature, 10 to 15 C.; killed at 25 C.; non-pathogenic. 



MICROSPORON FURFUR. 



Found in the scales cast off in pityriasis versicolor. When these 

 scales are treated with a 5 per cent, solution of caustic potash, and 

 examined microscopically, short, slightly branched mycelial threads are 

 seen, with very large conidia lying together in clusters. 



Cultivations have not yet been obtained. 



MICROSPORON MINUTISSIMUM. 



Found in the scales cast off in erythrasma, and similar to the above, 

 except that the mycelia and conidia are here excessively fine. 



