PENICILLIUM 



15$ 



cult. Thorn and Church (1926) divided them into the following 

 groups: (a) A. glaiiciis group, {b) A. nidiilans group, {c) A. 

 jimiigants group, {d) A. niger group, {e) A. flavus-oryzae group, 

 (/) A. clavatiis group, (g) A. oclyraceiis group, {h) A. njcentii 

 group, (i) A, flavipes group, and (j) A. versicolor group. Color 



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Fig. 52. Aspergillus repens. A. Segment of multinucleate hypha. B. Sec- 

 tional view of conidiophore, which is multinucleate throughout. C. Asco- 

 spore in optical section, which is also multinucleate and has thick verrucose 

 wall. D. Section of young sclerotium showing ascogonial coil. E. Same 

 section as D in surface view. F. Ascus. {A and C after Dale, B after 

 Fraser and Chambers, others after de Bary.) 



of Stalks and heads, shape of heads, shape of conidia, smoothness 

 or roughness of stalks, and one or two series of sterigmata con- 

 stitute the features employed in separating these groups. In a 

 recent account [Thom and Raper (1945)] the genus is divided 

 into 14 groups, and the synonymy of all valid species is recorded. 

 Important species and their activities. Aspergillus niger is as- 

 sociated with a rot of pomegranates [iMacAIurran (1912)] and of 

 figs [Hodgson (1918)1 and dates. It also causes decay of stored 

 tobaccos and cigars. Aspergillus glaitcm, A. flavtis, A. oryzae, 

 and A. ■iventii are all associated with the spoilage of walnuts, 



