ES SRA ee i ee Se NE ak Ll ot A NSE ae ew ery ee be 4. gt ESTA.) yg eee 
aS ae 
1913] COOPER—ISLE ROYALE 133 
rock was considerably disintegrated, and on areas not covered by 
the heath mat bore a rich lichen vegetation, the most important 
species, as usual in the late lichen stages, being the large cladonias. 
In the heath mat Juniperus communis var. depressa was dominant, 
Ax NS 
Abies balsamea Fd aan Ug 
Picea canadensis eo pte LLL 4 ABare rock -Cladomas,and other lichens 
Betula alha papyrifera O Idea names BE iperus, Vaccinium, Arctostaphylos 
Fic, 26.—Quadrat 7: in same rock opening as ~ 25; also illustrates shore con- 
ditions of type B; for Saucon of symbols see fig. 6 
and Juniperus horizontalis, Vaccinium pennsylvanicum, Arcto- 
staphylos Uva-ursi, and Calliergon Schreberi shared in its compo- 
sition. Crevice plants were frequent and forest herbs occurred 
sparingly. Undrained depressions were filled with Aulacomnium 
palustre (L.) Schwaegr. and Scirpus atrocinctus Fernald. These 
