CHARACTERISTICS OF MOLD GROWTH 101 



The fruiting body (asexual) consists of an erefet- condio- 

 phore usually ending more or less abruptly in a dilation or 

 head which bears closely packed sterigmata each of which 

 in turn bears a single chain of conidia, the newly formed 

 conidium being pushed away by the formation of a new 

 spore; thus the conidium at the end of the chain is the 

 oldest. The conidia of this mold are black. 



Penicillium italicum Blue-green mold 



The mycelium consists of septate hyphae, having fre- 

 quent dichotomous branching. 



The conidial fructification resembles a brush, the conidia 

 (spores) being borne on the end of conidiiferous cells (ster- 

 igmata) ; in this genus before the conidia appear, there is 

 generally a primary and even a secondary branching of the 

 condiophore in some species before the conidiiferous cells 

 are formed. The species of Penicillium have more of a 

 brush-like appearance than the species of Aspergillus. The 

 spores of P. italicum are blue-green. 



Oospora (Oidium) lactis White mold 



The mycelium consists of septate hyphse, having di- 

 chotomous branching; the hyphse are almost entirely sub- 

 merged in the nutrient substrate. 



This differs from the other molds in that it does not have 

 typical fruiting bodies. It reproduces by means of conidia, 

 which are formed by a simple division of the hyphse. 

 The conidia are colorless. 



REFERENCES 



MARSHALL: Microbiology, pp. 12-27. 



LAFAR: Technical Mycology, Vol. II, Part I, pp. 5, 15, 71-77; Part II, 



pp. 300-346, 451-455. 

 KLOCKER: Fermentation Studies, pp, 184, 185, 274-282, 303, 304. 



