CRYPTOGAMIA FUNGI. 211 



the little heads spherical, at first whitish but at length dark grey. 

 HOOK. Scot. ii. 13. M. ascophorus, Bot. Gall. ii. 914. Ascophora 

 mucedo, GREV. Fl. Edin. 448. ; Crypt. Fl. t. 269. 



Hab. On bread, paste, melted butter, &c. when kept. 



A very common sort of mould, and often productive of in- 

 jury to articles of daily use. It may, therefore, be useful 

 to know, that mouldiness may be prevented in almost any 

 article by the application of perfumes, such as those of the 

 essential oils, cloves, pepper, turpentine, &c Dr MAC- 

 CULL OCH in Edin. Phil. Journ. viii. 34. 



117. ASPERGILLUS. 



1. A. glaucus, filaments erect, simple, terminated with a glo- 

 bular head of spherical granules, at first white, but when mature 

 af a greyish-green GREV. FL Edin. 467. 



Hab. On various putrefying and damp substances, as fruit, 

 bread, cheese, &c. ; also infesting plants while drying 

 for the herbarium if not regularly changed. 



This is the plant so well known by the name of blue mould, 

 and there is much interest in its history. At first some 

 white cobweb-like filaments spread over the substance of 

 the infected substance, whence sprouts up a thick forest of 

 other filaments about |th of an inch in height, pellucid, 

 tubular, and obscurely marked with one or two joints. 

 Each filament is terminated with a globe, minute indeed 

 to our enlarged vision, but large and heavy when com- 

 pared with the slender stalk which supports it. This 



least, arranged in beaded lines of perfect uniformity. 



118. PENICILLIUM. 



1. P. glaucum, effused, flocculent, greyish-blue; filaments pel- 

 lucid, decumbent and erect, the latter with a cluster of very short 

 Dranches at the top, loaded with minute globular capsules. 

 REV. Crypt. Fl. t. 58. f. 1. ; Fl Edin. 467. 



Hab. On decaying agarics, in dense irregular mouldy spots 

 about 1 line high, common. 



Before maturity this mould is white. 



