PLANT ASSOCIATIONS AND HABITATS. 26 
As far as present observations extend, the fungus flora of the Labora- 
tory domain may be characterized as insignificant. A few parasitic forms 
of the Perisporiacee and other groups occur from year to year on certain 
annuals, and a few saprophytes have been found on bark, and, in two or 
three instances, growing in the low ground of the wash. Undoubtedly 
careful search would result in the collection of a considerable number 
of species, but the fact remains that the fungus flora here is extremely 
limited, as it would seem it must be from the severe conditions imposed. 
This meager showing is again in strong contrast with the rather rich 
display of fungi reported by Blumer (1908) in the Chiricahuas, and prob- 
ably matched in other neighboring mountain regions where favorable 
conditions prevail. | 
Better developed, and of more ecological interest, are the symbiotic 
plants constituting the lichen flora, an account of which is given on pages 
2AOs2 7. 
