Additional Records of Surrey Resupinate Hymenomycetes. 217 
of this species. The macroscopic appearance is similar to that 
of Corticium avachnoideum, but the characters of spores and 
basidia differ. 
The species as understood thus by Bourdot differs in several 
details from the original description of Hypochnus bisporus by 
Schroeter, notably in the size of the spores. Schroeter described 
his species as having spores 5 x 3-3°5, considerably smaller 
than those of the present species. Further the hyphae of 
H. bisporus were said to have clamp-connections, from which 
one would infer that they were fairly frequent. In the present 
form, however, these structures are so rare as to be easily over- 
looked unless careful search is made. 
On the other hand, Schroeter’s type specimen apparently no 
longer exists (cf. von Hoehnel and Litschauer in Ann. Myc. Iv, 
1906, p. 288), and in the absence of any information as to what 
it may have been, the name may well be kept for this species, 
which is characterised by its constantly 2-spored basidia. It 
should however be cited as above. 
Corticium diademiferum Bourd. et Galz. in Bull. Soc. Myc. Fr. 
XXVII, IQII, p. 244. 
Effused, adnate, very thin, whitish to cream, margin inde- 
terminate. Basidia 15-21 x 5-6 with 6-8 sterigmata. Spores 
subglobose, 4-5 x 3-4u. Hyphae thin-walled, with clamp- 
connections, 3-5 p. 
On bark of a birch log, Effingham, Mar. 1921, A.A.P. 
The above description is taken from that given by Bourdot 
and Galzin. The specimen cited was so determined by M. 
Bourdot, but has spores which are ovate rather than subglobose. 
The basidia are of the characteristic shape of the group Urnigera 
B. and G. 
Oo 
We y 3 
Fig. 2. Corticium diademiferum. Fig. 3. Corticium tulasnel- 
x 550. * loideum. x 550. 
Corticitum tulasnelloideum von Hoehn. et Litsch. in Sitz. K. 
Akad. Wiss. Wien, Math.-naturwiss. Kl., Bd. cxvi, I, 
1908, p. 1118. 
Effused, very thin, closely adnate, appearing as little more 
than a pruinosity on the surface of the matrix. Hymenium 
smooth and continuous when best developed. Basidia clavate, 
12-20 x 6-8 with 2-4 sterigmata, 6-7 long. Spores broadly 
elliptical to subglobose, very finely and closely echinulate, 
