CRITERIA OF SEX 201 



criteria Nos. 2-6, as listed above, were employed. A haploid 

 mycelium was never regarded as haploid unless its septa proved to 



Fig. 117. — Coprinun lagopu-s, a lieterotliallic Hyineuoinycete. A diploid mycelium, 

 {AB)^{nb), formed by mating tlie haploid mycelium No. 2 {AB) of Table I 

 witli the haploid mycelium No. (5 {ab) of Table 1. The large Petri dish, of which 

 a portion is shown, contained cleared dung-agar. The dung-agar was inoculated 

 at the centre with a small piece of dung-agar (the piece can be seen) in which 

 an {AB)-\-(ah) mycelium was growing and which had been removed from 

 another dish. The photograph was taken twelve days after inoculation. 

 The radial rate of growth has been about 4-5 mm. per day or approximately 

 0-19 mm. per liour. The mycelium produced no oidia and was more fluffy 

 at the surface than either of tlie two haploid mycelia (AB) and {ab) from which 

 it was derived. So far no fruit-body has been formed (for fruit-bodies produced 

 in dung-agar cultures, vide infra. Fig. 139). Natural size. 



be devoid of clamp-connexions and it exhibited the wide-angled 

 haploid mode of branching ; and a diploid mycelium was never 



