ON BRITISH OAKS. 393 
Stromatospheria parallela, on dead trees. 
= nivea, on dead branches. 
3 quercina, on dead branches. 
Cryptospheria bifrons, on the dry leaves. 
Pf punctiformis, on dead leaves. 
Spheria biphemia, on dead branches. 
Phacidium coronatum, on dead leaves, 
m dentatum, on living leaves. 
Hysterium pulicare, on the rugged bark. 
a quercinum, on dead branches. 
Xyloma pexizoideum, on dead leaves, 
Scleroderma citrinum, on the roots. 
Erineum griseum, under the leaf. 
Merulius rufus lachrymans, the dry-rot fungus, is perhaps 
the most to be dreaded, working in the timbers of 
buildings silently and unseen with fatal effect. 
The fungi in their action on the trunks and fallen branches 
assist in the disintegration and decomposition of the wood, and 
finally to assimilate it again with the soil. 
The Lichens which grow on the trunks and branches of most of 
our trees are an interesting study. They give to them a hoary 
and venerable appearance when the trees are 
’ 
** Mossed with age.’ 
The following are to be found on the oak, but of course there 
are many more which grow indiscriminately on the trunks and 
branches of it and other trees :— 
Spiloma microclonum, on old trees. 
” punctatum, on old trees. 
Lecidea carneola, on old trees. 
Calicium microcephalum, on oak rails. 
zs hyperellum, on old trees. 
Thelotrema melaleucum, on young trees, 
“= hymenium, on old trees. 
Beomyces cespititius, on the tree. 
Ramalina pollinaria, on old trees. 
Verrucaria analepta, on the bark. 
Sticta pulmonacea, liver-wort, which, when growing on the 
oak, is called ‘lungs of oak,” and is supposed then 
to be specially efficacious in the cure of consumption 
and other diseases. 
VOL. XIII. PART I. Cc 
