ASCOMYCETES 



643 



physes. In many Ascomycetes, in addition to the ascospores, 

 ordinary exogenous spores or conids are produced at the extremity 

 of sporophores or conidiophores (fig. 480, A). This is the case with 

 a large number of moulds or mildews, of which the common blue 

 mould, Penicillium glaucum, may be taken as a type. The familiar 

 form of these moulds is that in which they produce these spores in 

 enormous quantities ; but, under certain conditions, especially when 

 the supply of nutriment is limited, the sexual mode of reproduction 



FIG. 480. Development of Eurotium repens: A, small part of a mycele with the 

 conidiophore, c, and young ascogones, as ; B, the spiral ascogone, as, with the 

 antheridial branch, p ; C, the same with the filaments beginning to grow round it 

 to form the wall of the sporocarp ; D, a sporocarp seen from without ; E, F, 

 young sporocarp in optical longitudinal section ; w, parietal cells ; /, the filling 

 tissue (pseudo-parenchymatous) ; as, the ascogone ; G, an ascus ; H, an ascospore. 

 After De Bary. A, magnified 190, the rest 600 times. 



sets up (fig. 480, B-H). One of the branches of the mycele 

 elongates, and coils spirally upon itself into a corkscrew-like body, 

 the carpogone or ascogone, which constitutes the female organ \ 

 whilst another branch acts as the male organ or antherid, extending 

 itself over the spire and impregnating the ascogone by the passage of 

 its protoplasm into the latter organ. The structure thus formed 

 becomes enclosed in a mass of sterile tissue, and within this are 



Kleveloped the asci, each containing numerous spores, which 

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