6 OTTO V. DARBISHIRE. [SEC. ARCT. EXP. FR AM 



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 pi/racea, Gyalolechia subsimilis, Lecanora epi- 

 bryon, Aspicilia verrucosa, Rinodina turfacea and even, firmly atta- 

 ched, Thamuolia vermicular is. 



