6 OTTO V. DARBISHIRE. [SEC. ARCT, EXP. FRAM 
Three habitats deserve special mention, namely the bones of ani- 
mals found in the soil and projecting a little, drift-wood, and droppings 
of the musk-ox. 
The following few plants have been observed on various bones: 
Lecanora varia, Hageni, Rinodina turfacea, and Buellia parasema. 
It is important to notice that these lichens growing on bones as far as 
I can make out only very slowly decompose their organic subtratum. 
There is no sign of decay. 
Driftwood I have found to bear specimens of Caloplaca cerina, 
citrina and jungermanniae, Lecanora epibryon and Buellia myrio- 
carpa. The wood I examined consisted of oak-planks. 
Another substratum with a characteristic flora of lichens was that 
of the droppings of the musk-ox. On these I have found Biatorina 
globulosa, Caloplaca pyracea, Gyalolechia subsimilis, Lecanora epi- 
bryon, Aspicilia verrucosa, Rinodina turfacea and even, firmly atta- 
ched, Thamnolia vermicularis. 
