REPORT ON THE LICHENS OF EPPING FOREST. 101
Tribe—USNEEI.
Usnea hirta, Hoffm.
On sallow trunk, Blackweir Hill ; sterile.
Tribe—CETRARIEI.
Cetraria aculeata, Fr.
form hispida, Cromb.
Heathy ground, E. border of Great Monk Wood ; Black-
weir Hill ; Highbeach ; spermogoniferous.
Platysma glaucum, Nyl.
On projecting beech-roots, Great Monk Wood ; sterile.
Tribe—PARMELIEI.
Parmelia perlata, Ach. Meth.
On oak trunk, S. slope of Loughton Camp ; on beech
roots, Great and Little Monk Woods ; Epping Thicks ;
sterile, in poor condition.
P. sulcata, Tayl.
On stump, Great Monk Wood ; on oak trunk, Staples
Hill ; on projecting hornbeam root, W. of Wake Valley ;
sterile.
P. caperata, Ach. Meth.
On tree-root, Epping Upland ; small and in poor con-
dition ; sterile.
P. fuliginosa, Nyl.
var. laetevirens, Nyl.
On hornbeam and crab trunks, S. of Loughton Camp ;
sterile.
Tribe—PELTIGEREI
Peltigera spuria, Leight.
On heathy ground about the Wake Arms ; west of
Loughton Camp ; fertile.
Tribe—PHYSCIEI.
Physcia lychnea, Nyl.
At base of ash trunk, by the Roding at Buckhurst Hill ;
ditto at Blackacre, Theydon Bois ; fertile.
P. pulverulenta, Nyl.
Sub. sp. pityrea, Nyl.
On old tombstones, St. Nicholas Churchyard, Loughton ;
fertile ; on beech trunk, Little Monk Wood, on tree