14 THE LICHENS OF PERTHSHIRE 
phyllascella, ae. ed tage 8 o—- hispidula, sag, soe 
strumaticus, P. olus, Stic — Pertusa ea, 
Lecidea pheops, rE, ‘Brayers zana, es fuliginosa, L. con rie D. 
seer ayes var. alpina, Rhizocarpon ; sonceutte Verrucaria 
margac Some of a probably find ans way down in the 
currents ae steaans from the subalpine zo 
ranitic and sain rocks the raceat flora resembles iS 
of siliceous rocks oi: oy that of calcareous rocks. 
commoner Parmeliz and the Gyrophore flourish on them. The 
species are ube rect soralh odes S. fragilis, Alectoria bicolor, 
Platysma Fahlunense, P. commiztum, P. glaucum, P. lacunosum, 
P. saxatilis, P. omphalodes, P. Mougeotsi, P. stygia, P. tristis, 
P. lanata, Gyro oghord proboscidea, G. cylindrica, Gg. torrefacta, 
G. polyphylla, G. flocculosa, Squamaria gelida, Lecanora atra, 
e 
Dicksonii, A. cinerea, Acarospora peliocypha, Pertusaria dealbata, 
Stereocaulon De liset, S. evolutum, S. coralloides, S. denudatum, 
Lecidea lugubris, L. inserena, L. paneola, L. contigua, L. confluens, 
L. Lipoid, L. plana, L. mesotropa, L. auriculata, L. diducens, 
L. aglea, E ecieote L. Kochiana, L. pycnocarpa, Buellia atrata, 
Ehizocarpon Eder : 
ahh The Acoli alpine Zone.—-Dr. W. G. Smith has defined 
the associations of this zone in British Vegetation, so far as 
Cryptogamic vegetation plays an important réle in all the minor 
associations into which these formations are subdivided. In the 
first formation, five associations may be distinguished, but they 
intergrade considerably, and are often difficult to recognise in 
—— areas, where every yard seems to introduce new combina- 
tio The Moss-Lichen Association occupies large areas on 
pranitis and quartzite mountain summits, but on cae ise 
such as occur on Ben Lawers, the open associations ar 
limited in extent, the weathering rock rapidly filling in — 
instertices, and allowing the plant-covering to become continuous. 
This association on the various Perthshire summits includes the 
following lichens :— 
uopsis granatina, Spherophorus coralloides, S. fragilis, 
Gyrophora polyphylla, Parmelia saxatilis, P. omphalodes, P. 
lanata, P. stygia, P. alpicola, P. vittata, Cetraria aculeata, C. 
crispa, C. islandica, Platysma triste, P. nivale, Lecanora tartarea 
var. frigida, L. upsaliensis, L. gemmiparum, Aspicilia oculata, 
Pertusaria dactylina, P. glomerata, Stereocaulon denudatum, S. 
tomentosum, S. alpinum, Cladonia coccifera, C. gracilis, ~ race- 
mosa, C. uncialis, C. marion Lecidea arctica, L. limosa, L. 
restates demissa, L. ulig , L. cuprea, L. Ber snengiein 
Li. cupreiformis, L. dain yore many of the Lecidex from the 
