104 STUDY AND IDENTIFICATION OF MOULDS 



ectothrix of Sabouraud. The external spores are 

 in chains or in short mycelial threads, not mosaics of 

 spores. There are varieties from horse, cat and 

 bird. The lesions are more inflammatory than 

 those of the endothrix class. Most of the beard and 

 bcdy ringworms belong to this group very few 

 scalp cases. The cultures are finely rayed. The 

 so called small spored ringw r orm is the Microsporum 

 audouini. The fungus is packed as a mcsaic of 

 spores, chiefly on the outside of the hairs. It is 

 the chief cause of the ringworm of the scalp of 

 children. It gives a downy-white culture. 



The Achorion schoenleini is the cause of favus. The cultures are 

 rather wrinkled. It is characterized by the scutulum or favus cup. 



In the suborder Carpoascus w r e have to consider the family Peri- 

 sporiaceae. In this family the asci are completely enclosed by the 

 investing membrane, the perithecium. When this rots the spores are 

 set free. There are two genera of interest. Penicillium and Asper- 

 gillus. 



Penicillium. While Penicillium does at times form perithecia, yet 

 they characteristically show chains of spores. The common P. glaucum 

 resembles a hand with terminal beads. 



P. Crustaceum. Is the common blue-green mould. It has 



been deemed pathogenic in cases of chronic catarrh 



of the eustachian tube and in gastric hyperacidity. 



Aspergillus. These have sterigmata carrying chains of spores. 



Of the pathogenic Aspergilli we have: 



1. A. fumigatus. This has been considered as the cause of 



pellagra. 



2. A. repens. This has been found in the auditory canal 



and may produce a false membrane. 



3. A. flavus. This has been found in the discharges of 



chronic ear diseases. 



4. A. concentricus. Tnis is the cause of an important 



tropical ringworm, Tinea imbricata. The scales 



