334 MORPHOLOGY OF THE ASPERGILLACE^E. 



and also from the macroscopically similar members of other 

 genera (Citromyces species, Aspergillusfumigatus), distinguishable 

 at once by the structure of their conidiophores, though confusion 

 has probably occurred in the literature from the grouping of all 

 green moulds as P. glaucum. Link. Nothing, in fact, is so 

 deceptive as the exactly similar green shade common to the 



FIG. 178. Penicillium glaucuui. 



Conidiophores exhibiting cliversiQed branchings (a, a') ; ascospore with ripening 

 asci (6) ; isolated ascus in course of sporogeuation (c) ; spores viewed laterally (d). 

 Magn. of a, 315 ; of b, 150 ; of c, 630 ; of d, 800 (After Brefeld.) 



growths of a large number of species, most of the Penitilliwm 

 group being ( f this colour. 



The Penicillium glaucum of BREFELD (lY.)exhibits the following 

 characteristics (see Fig. 178). The conidia are globular, smooth, 

 2.5 /u thick, and occur as long coherent chains on pointed cylindrical 

 sterigmata, measuring about 5-13^ long and 3-4 // thick. The 

 branching of the conidiophores varies considerably (see Fig.), 

 and these organs measure 200-400^ in length, each twig being 

 crowned with a tuft of (up to 12) sterigmata, which are usually 

 shorter than their bearing cells. The colour of the herbage and 

 vegetation is pale ? or dark green, becoming discoloured with age ; 



