and the causes affecting its recent diminution. 67
Var. elaeochroma, Ach.—On hornbeam beyond the "King's
Oak." Very sparingly (J. M. C).
L. crustulata, Ach.—On flints about High Beach. Rather
rare (J. M. C).
L. contigua, Ach. — On walls at Walthamstow (E. P.),
fide Forster's MS. notes. There is no specimen in his Hb.,
and probably it is not the true plant.
L. petraea, Wulf.—On pebbles at Walthamstow, and on a
stone at Epping Forest (Hb. E. F. s. n. Lichen fusco-ater).
On flints here and there in the Forest, plentiful about High
Beach (J. M. C).
L. alboatra, var. epipolia, Ach. — On walls about Wal-
thamstow (Hb. E. F.). I have not anywhere observed this
plant.
L. myriocarpa, DC. — Elms at Higham Lodge, Waltham-
stow (D. Turner), fide Forster's MS. notes, s. n. Lichen
pinicola. On a tree in field at Hoe Street (Hb. E. F.). In
Hawk Wood, at High Beach, and elsewhere in the Forest.
Not uncommon (J. M. C).
L. premnea, Ach. — On trees on Epping and Hainault
Forests (E. F.), fide Forster's MS. notes, s. n. Lichen abie-
tinus. Near Chapel Lodge Farm, Hainault Forest; and also
near the "Bald-faced Stag," Epping Forest (Hb. E.F.). Near
the "King's Oak," and Copthall. Sparingly (J. M. C).
L. ostreata, Hoffm.—In garden, Hoe Street, Walthamstow.
Sterile (Hb. E. F. s. n. Lichen scalaris). On palings at The
Warren, and Copthall. Sterile (J. M. C).
L. caradocensis, Leight. — On decorticated trunks of old
trees at Hawk Wood, and near High Beach. Sterile
(J. M. C).
Tribe—Graphidiei.
Graphis elegans, Sm. — On an old holly near High Beach
(J. M. C). Not seen elsewhere, and now apparently extinct.
F. coarcervata, Leight. — On an old ash-tree (since felled)
near Copthall Lodge (J. M. C). Only a single specimen seen.
G. dendritica, Ach. — On Epping Forest, between Wood-
ford Wells and Chingford Hatch (Hb. E. F.). Formerly
plentiful about High Beach, but now rare (J. M. C).