50 



;ri-;Ki ^■.\R^■ i>A'rii(>Ltn;'i". 



found in the lesion and is prol)ably strictly parasitic. Structurally 

 it is composed of a simple or branched m_vcelium which may 

 becijme broken up as a thread of o\-(iid spores. The spores may 

 also apjiear in s^roups in the hair follicles, ddic disease becomes 

 e\'ident because of the presence of small circular hairless patches 

 which are Cdvered b\- L;ra\-ish crusts nr scales. As the disease 

 priiorcsses the central portinn of the le-^il)n becomes normal and 

 the peripheral tissue l.")ecomes invoh-ed. This condition has 

 been obser\ed in the horse and nx; other domestic animals 

 rareh' become affected. 



.'Ispenjilliis Piiinii/dliis is responsible Tor an occasional out- 

 break' of pulmonar-\- nu'cosis ( rneumo-mycosis AspeT,L;'illosis ) 

 ill birds. This fmifjus is of common occurrence in nature. 

 Structurally the funqiis consists of a se!2"mented nncelium 



'\Hp«'rK:illuH Funii^aUiH. 



which may branch diehotomously and from which upri,t?ht 

 stems termed hyphae iua_\- originate. These li\])hae may be 

 segmented and terminate in clubdike heads. A tuft of hair- 

 like projections ( sterit^mata ) develops from the hyiiha head and 

 on the distal end of each hair there is a spore bearin<T organ 

 (conidium). The entire liy])lia head with its sjiore Ijcai-in- 

 organs is included in a capsule the rupture of which is nec-^ 

 essary for the distri1)ution of the spores. The s])ores of Asper- 

 gillus are present in large numbers in ha\-, straw, barn-vard 



