PENICILLIUM. 325 



cells very many can be counted ; in the shorter branches of the 

 whorls on the gonidiophores, only one or two ; in the sterigmata, 

 probably only one at the upper end. The sterigmata, however, 

 are usually filled so thickly with contents at the apex that the 

 identification of the nucleus in them is impossible. In the gonidia 

 also, with the strongest magnification, a- nucleus can be dis- 

 tinguished with certainty for each. 



We may add that besides the above-described gonidiophores, 

 it is possible to rear upon Penicillium a second kind of fruiting 

 body. These arise in suitably managed culture en masse, have 

 the size of small pin-heads, and a yellowish colour. In their 

 interior, after longer period of rest, asci are formed, each of which 

 produces eight spores (ascospores). Therefore Penicillium must 

 be set down as an Ascomycete, one representing the section of 

 cleistocarpous Ascomycetes, with closed fructification. Out of 

 the spores developed in the asci the brush-like gonidiophores have 

 been again developed upon the object-slide. 



