302 Yorkshire Naturalists at Stamford Bridge. 
ground and rounded into various shapes, some being exactly 
circular in outline. 
In past years this moss grew to such a size or Strensall 
Common that Wilson, the great bryologist, mistook them at a 
distance for sheep. Other mosses seen on this occasion were 
Barbula cylindrica, Eurhynchium rusciforme, Fontinalis anti- 
pyretica, Brachythecoum rutabulum, Tortula muralis, and 
Grimmia pulvinata, all at the Lock. 
In the marshy ground in the wood where the Bog Pimpernel 
erows, Mr. Cheetham detected a small tuft of the rare moss, 
Bryum erythrocarpum—a new record for Buttercrambe Woods. 
The writer found this moss in abundant fruit on Strensall 
Common on roth August, 1906. 
On the muddy banks of the Derwent the Alga, Botrydiwm 
granulatum was frequently seen. This also occurs on the 
side of a pond near Skipwith Church. Both these habitats 
are in the East Riding. 
By the roadside near Stamford Bridge the dried-up bed of a 
shallow pool was carpeted with the moss Hypnum aduncum 
var. tutermedium, all brown and golden in colour. 
MycoLtocy.—Mr. W. N. Cheesman, J.P., writes :—Messrs. 
A. E. Peck, Fowler Jones, and the writer, proceeded on arrival 
to Buttercrambe Woods, where the day was spent. The dry 
condition on entering was somewhat disappointing, but on 
nearing the moist places along the lake side the collecting proved 
quite satisfactory, and a total of 60 species was the result. 
Some attention was directed to the species of fungi injurious to 
forest trees, three of which were somewhat conspicuous by the 
havoc they had wrought, viz. :— 
Dasyscypha calycina causing the Larch disease. 
Polyporus betulinus destroying the Birch trees. 
Armillaria mellea killing several species of deciduous 
ihees.:, 
No sporophores of the last-named were observed but the 
black cord-like mycelium (rhizomorphs) between bark and wood 
on fallen trees gave unmistakable evidence of the foe. 
Several other parasitic fungi (Polyporus hispidus on ash, 
Hirnoela Auricula-judae on elder, Polystictus abietinus on Pinus 
sylvestris, Bulgaria polymorpha on oak, etc.) were seen flourish- 
ing without any apparent inconvenience to the host plants. 
A fine sporophore of Lenzites betulina was found on alder with 
the hymenium surface in pores and gills, showing its inter- 
mediate position between the Agaricine and the Polyporee. 
The odour of Ithyphallus impudicus was strongly in evidence 
in the moist parts of the woods, and at the meeting a collection 
of specimens was passed round showing the plant in all stages 
from the egg-shape beginning to the mature form then deodour- 
ised. Notable amongst the Mycetozoa was an abundant growth 
Naturalist, 
