216 Transactions British Mycological Society. 
SOME ADDITIONAL RECORDS OF SURREY 
RESUPINATE HYMENOMYCETES. 
With 8 Text-figures. 
By E. M. Wakefield and A. A. Pearson. 
The present list contains a larger proportion of Heterobasidiae 
than were contained in our previous lists, and this group will 
evidently well repay further attention. The specimens however 
must be studied soon after gathering, when the hymenial cells 
are turgid. They soon collapse on drying, and little or no trace 
of the plant may remain. Some species are of such a delicate 
colourless nature that their presence is only made manifest to 
the naked eye by the faintly pruinose appearance of the wood 
on which they grow. A lens reveals the thin transparent film, 
and if gathered at a favourable stage of development the micro- 
scopic characters are easily detected. Soon after maturity 
however the hymenial elements are apt to become indistinct, 
and often only the spores can be found. This especially applies 
to species of the genus Tulasnella. These have frequently been 
found in an imperfect condition, and it is probable that many 
more exist than have been described. The two new species 
included in the present list are both exceedingly thin and delicate 
even when at their best, and are easily overlooked. 
Corticium bisporum Bourd. et Galz. in Bull. Soc. Myc. Fr. xxvii, 
IgiI, p. 240. ? Hypochnus bisporus Schroet., Pilz. Schles. 
. 415. 
Effused, indeterminate, white to cream, easily separable, very 
thin. Hymenium forming a continuous pellicle above the loose 
cottony subiculum, often wrinkled or rather bullate when fresh 
but becoming quite smooth as 
it dries. Basidia arising from 
a A branched hyphae in a corym- 
lan bose manner, clavate, 15-25 x 
0 6~-7°5 »; sterigmata constantly 
2, short (4-5), divergent. 
Spores ovate, elliptical or 
1 somewhat oblong, hyaline, 
Fig. 1. Corticium bisporum. x 550. smooth, 8-1I x 4:5-6y. Basal 
hyphae very loosely inter- 
woven, septate, very rarely with clamp-connections, 4-6 in 
diameter. Rod-shaped crystals present in abundance in the 
subhymenial tissue. 
On a fallen branch, East Horsley, Jan. 1922, A.A.P. 
We are indebted to M. l’Abbé Bourdot for the identification 
