COMMON GREEN MOULD. 



Fio. 1. Showing — 



Dichotomously branched hypha (Gr. dichotvmia, a division into two parts) subdivided by sejita. 

 Granular vacuolated protoplasm in the cells. 



Aerial hypha, branching at its ends like a brush or pencil, hence tlie name Penicillinm. 

 The terminal branches, corresponding to the hairs of the brush, breaking up into stylu-conidiu 

 (Gr. stulos, a stalk ; Iwnis, dust). 

 Fig. 2. The Conidia. Showing — • 



Size — j^o inch in diameter. 

 Form — Spherical. 



< AVall. 

 Structure — i Protoplasm. 



(. Vacuole. 

 Germination — 



a ^ b. Eminence formed at one point of the conidium. 

 e. Eminences formed at two points. 



d, e, ^ f. Elongation and subdivision of the eminences by septa. 

 A'ofc— The ultimate result of the growth of the conidium is to produce a reiiicilliiuii like that in fig. 1. 

 Fig. 3. Showing the Sexual Peocess — 



This has quite recently been made out, and occurs under peculiar conditions, as yet attained 

 only by artificial means. The male element or autheridium (Gr. antlios, a flower ; eidos, form) 

 is a short branch of a hypha, the female element or carpogonium (Gr. carpos, fruit ; gone, seed; 

 also a short branch coiled like a cork-screw. These two elements come together and exercise on 

 one another some reciprocal influence. A sexual process of this kind, where the conjiiijaiiwj 

 elements are different, is called Fertilization. As the result of fertilization a fruit or sporocarp 

 is produced, like a little pin-head. That fruit consists of an outer mass of sterile hyphre 

 enclosing a mass of fertile hyphse. These fertile hypha; are developed from the female element. 

 Fig. 4. Section of Spokocaep (Gr. spora, a seed ; carpos, fruit) or FraiiT — 

 Sterile tissue. 



Fertile tis.sue in centre (red). 

 Fig. 5. Portion of Fertile Tissue removed from Sporocarp. Showing — 

 a. Asci or cells containing spores (Gr. aslws, a bag). 

 h. An ascospore removed from an ascus. 

 Fig. 6. Showing Germination of Ascospore. 



CLASSIFICATION OP PENICILLIUM. 



Kingdom — Plantte. 



Sub-Kingdom — Thallophyta. 



Class — Carposporeae, because it possesses a sporocarp. 



Group — Fungi. 



Order — Ascomycetes, because of the asci. 



Genus — Penicillium (L. penicillum, a painter's brush). 



Common Name — Green ^Mould. 



