262 Transactions British Mycological Society. 
Table I. Coprinus lagopus: The Effect of Pairing 
Monosporous Mycelia. 
Clamp-connections Fruit-body 
Mycelial Sexual 4-7 days after development 
pairs signs pairing in the plates 
3x14 absent im perfect 
4x14 
6x14 
7x14 
9x14 
10 x14 
re te ap | 
12x14 
13 x14 
15 x14 
16 x14 
17 x14 
18 x14 
19 x14 
20 x 14 
21 x14 
22x14 
2 ex 
25x14 
26x14 
27 x14 
28 x14 
29 x14 
47 x 46 
48 x 46 
51 x 46 
52 x46 
53 x 46 
54 x 46 
55 x46 9 
17 pairs in which clamp-connections had appeared. No. 14 was - 
given a (+) sign, but this was done quite arbitrarily, for morpho- 
logically No. 14 did not differ from the other mycelia. The 
mycelia with which No. 14 had produced clamp-connections 
were then given a (—) sign, and the mycelia with which No. 14 
had not produced clamp-connections were given a (+) sign. 
Subsequently it was found that clamp-connections were formed 
when No. 46 was mated with No. 14. Since No. 14 had a 
(+) sign, it was therefore necessary to give No. 46 a (—) sign. 
Nos. 51-55 all produced clamp-connections with No. 46. Hence 
they were given a (+) sign; and, since Nos. 47 and 48 did not 
yield clamp-connections with No. 46, they were given a (—) sign. 
All these signs are shown in Table I. 
The pairs of mycelia which developed clamp-connections also 
developed normal fruit-bodies. About a week after the matings 
had been effected, these fruit-bodies expanded and shed an 
abundance of their black spores. On the contrary, the pairs of 
mycelia which remained in the primary condition and did not 
” ” 
” ” 
present perfect 
: perfect 
absent — 
i imperfect 
present perfect 
absent imperfect 
present perfect 
” 
>”? 
absent 
present 
” 
t++t4ttirbr rrr rte pte teti oy tbe tt+ 
St pee Speers ae eet te tei at oe amet ote ae tigat 
fet sh. Le hee Se Se 
