PENICILLIUM 



165 



lightly connected, so that a slight jar or a current of 

 air is sufficient to detach them, and they float off into 



Fig. 16. — Reproduction of Mucor. (i) Spore formation (a-H) : 

 a, young sporangium (sp) ; b, optical section of mature sporangium 

 {col., columella) ; c, remains of sporangium wall after bursting, 

 with a few spores still adhering ; d, germinating spore with two germ 

 tubes. {2) e-h. Conjugation : e, conjugating hyphas in contact ; 

 /, separation of tips of conjugating hyphse ; g, later stage ; h, 

 mature zygote; i, germination of zygote, germ tube forming a 

 single sporangium. 



Penicillium : j, part of branched conidiophore budding off 

 chains of conidia. 



the air, where they behave as spores, germinating on 

 any favourable substratum on which they may happen 

 to settle. 



