MR. W. WEST : ECOLOGICAL NOTES. 81 
arboreal form of Stereodon cupressiformis was yet fairly frequent ; but in the 
same wood at some distance, where the ground was flat and somewhat 
marshy, the epiphytic lichens began to be frequent, clearly showing the 
influence of a more constantly moist atmosphere. 
Many other Oaks were examined in another wood similar to the last, the 
trunks were less than half covered with epiphytes ; the chief one was 
Stereodon cupressiformis var., with scattered patches of Frullania dilatata, 
and scattered amongst these were small quantities of Lecanora parella, Pertu- 
saria leioplaca, and Leeidea ратазета. The trunks of the few Sycamores 
amongst the latter were barer than the Oaks, but were well clothed about 
their lower part with /sothecium myosuroides and Stereodon cupressiformis. 
At a higher zone in this wood a number of Oaks bore in their lower part 
Stereodon cupressiformis often mixed with Mnium hornum, higher up was a 
mixed association of Dicranum scoparium, Frullania dilatata, Cladonia fim- 
briata, Parmelia physodes, P. saxatilis, Evernia Prunastri, with several 
species of Pertusaria ; the dead branches were attacked by Chlorosplenium 
æruginosum. 
Some Oaks and their branches, near Capel Curig. 
| | 
9 
Name of epiphyte | p lot of | po d 3rd lot of 3 lots of blown-off 
pipnyte. | Cake. Cn ks. Oaks, branches of Oaks, 
Stereodon cupressiformis ......... | 5 | 8 10 
| | Mostly 
| | below. 
Isothecium myosuroides — ......... | wee 10 5 5 
Frullania Taimarisci .. ......... | 40 25 
Lecanora {атїатеа.................. | 40 35 m 20 
Parmelia levigata ............... | 3 | 3 A little. 
| 
Parmelia physodes ............... 2 e 2. 10 40 15 
Parmelia saxatilis —................ КА ... 2 30 10 10 
Platysma glaucum _............... 2 A little. 2 25 
Evernia Prunastri ............... Alittle, | A little. | 3 
Sub-bareness ....... MERE The rest. | The rest. | The rest. | The rest. The rest. The rest. 
‚ In addition to the above а little of the following was present :— Cladonia 
fimbriata and Usnea ceratina. The average approximate percentages of the 
chief species on the above (trunks and branches) were :— Lecanora tartarea 16, 
Frullania Tamarisci 11, Isothecitum myosuroides З, Stereodon cupressiformis 4, 
Parmelia physodes 11, P. saxatilis 9, Platysma glaucum 5. 
Some other Oaks, much exposed to winds from the mountains, bore 35 
