382 



MEDICAL MYCOLOGY 





lateral, and intercalary. When the chlamydospores are large and 

 spindle-shaped, thev are known as fuseaux, according to the ter- 

 minology of Sabouraud. Fuseaux may be borne terminally or 



laterally; they occur singly. 

 Thev may be smooth, or the 

 entire surface or a portion of it 

 may be covered with projec- 

 tions. They may consist of one 

 cell or be septate. In some in- 

 stances lateral chlamydospores 

 are borne on a pedicel and 

 hence are called "pedicellate 

 chlamydospores." This type of 

 chlamydospore may be sepa- 

 rate from the parent hypha or 

 may lack a septation. 



g. Aleuries or aleuro- 

 spores. Spores that develop by 

 migration of protoplasts from 

 the hyphal cell into the devel- 

 oping spores, leaving the hy- 

 phal cell empty, are known as 

 aleuries or aleurospores. They 

 may not be abstricted and may 

 remain attached, or a septum 

 may be laid down. The hy- 

 phae that bear aleuries may be 

 simple or copiously branched. 

 The aleuries of copiously 

 branched hyphae may adhere 

 in grape-like bunches. 



Classification. The clas- 

 sification of the members of 

 this group is a difficult task, and considerable disagreement exists 

 concerning what characteristics constitute an adequate basis for 

 distinguishing genera and species. Clinical aspects of the disease 

 complex have been given precedence by some workers, purely 

 mycological features by others, cultural characters by others, 

 and host relations by others. This situation may be illustrated 

 bv the delimitation of the Genus Achorion to include fungi which 





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•K 



Fig. 73. Diagrams illustrating the re- 

 lationship of the fungi to hairs in: 

 A. Microsporum. B. Endothrix Tri- 

 chophyton. C. Ectothrix Tricho- 

 phyton. Spores arise at or near the 

 opening of the hair follicle. (After 

 Henrici.) 



