and the causes affecting its recent diminution. 65 
P. coccodes, f. bacillosa, Nyl. — At the edge of Hoghill 
Pond, Hainault Forest. Fertile (Hb. E. F.j. I have not 
anywhere seen either the type or this form. 
P. fallax, Pers. — On Epping Forest and in Hainault 
Forest. Fertile (Hb. E. F.). About High Beach. Fertile 
(J. M. C.). Occurs also elsewhere, but usually in an im¬ 
perfect condition. 
P. lutesoens, Hoffm. — On Epping Forest. Sterile ( Hb. 
E. F.). On an old tree, since felled, near the King’s Oak. 
Sterile (J. M. C.). 
Phlyctis AGELiEA, Wallr.—On trees by the roadside beyond 
the King’s Oak (J. M. C.). Now extinct in that locality, but 
probably to be detected elsewhere. 
P. argena. Flk. — Near the King’s Oak, High Beach (Hb. 
E. F.). I have not seen this species in a fertile condition, 
though what may be the sterile thallus occurs in various parts. 
Tribe —Thelotremei. 
Thelotrema lepadinum, Ach.—On hornbeam at Waltham¬ 
stow (Hb. E. F. s. n. Lichen inclusus). At High Beach, and 
Wintry Wood, near Epping (J. M. 0.). Apparently a rare 
lichen in the Forest. 
Urceolaria scruposa, Ach. — On walls of garden, Hoe 
Street, Walthamstow (Hb. E. F.). On mortar of walls at 
Epping (J. M. C.). I have not recently seen this species. 
Tribe —Lecideei. 
a. Biatora. 
Lecidea lightfootii, Sm. — On a tree at Walthamstow 
(E. F.), Jide Forster’s MS. notes. There is, however, no 
specimen in his Hb., and I have nowhere seen it in the 
Forest. 
L. quernea, Dcks. — On an oak in the Forest (Hb. E. F.). 
Also formerly at High Beach (J. M. C.). I have recently 
observed only the sterile thallus, and that but sparingly. 
L. coarctata, Ach.—On bricks in the Forest, near Salter’s 
Buildings (Hb. E. F.). Now apparently extinct in the Forest. 
L. decolorans, Flk. — On the ground amongst heaths in 
Lodge Road. Very rare, and seen only in one spot (J. M. C.). 
F 
