and the causes affecting its recent diminution. 61
sterile. Also on palings of a garden, Hoe Street; sterile
(Hb. E. F.). On old trees in various parts of the Forest;
sterile and but little evolute (J. M. C.).
P. acetabulum, Neck. — On a lime-tree near Quendon
Street, and on an elm opposite the King's Oak, High Beach.
Sterile (Hb. E. F.). This species is evidently now extinct.
P. exasperata, Ach. — On trunks of trees at High Beach,
the Long Running, and other localities. Sterile (J. M. C).
P. subaurifera, Nyl.—On trees near High Beach. Sterile
and poorly developed (J. M. C).
P. physodes, f. labrosa, Ach. — In a garden, Hoe Street,
Walthamstow. Sterile (Hb. E. F.). In Forster's MS. notes
it is said to occur "in fructification on some boards on the
edge of Hoghill Pond," but there is no specimen preserved in
his Hb. About High Beach; sterile (J. M. C). Also
sparingly and but little evolute in other localities.
Tribe—Stictei.
Lobaria pulmonaria, L. — On a tree in the Forest, near
Loughton. Sterile (Hb. E. F.). Evidently now extinct.
Tribe—Peltigerei.
Peltigera canina, L. — Common in the Forest. Fertile
(Hb. E. F.). At present rather rare, and seldom in fruit
(J. M. C).
P. polydactyla, Hoffm.— In fields near High Beach, and
on the ground here and there in the N. parts of the Forest,
but rarely with apothecia (J. M. C.).
Tribe—Physciei.
Physcia parietina, L. — On old elms near the King's Oak,
High Beach. Fertile (J. M. C). Formerly abundant, but
now rare in that locality; also near Epping Station and
Copthall, but not common.
F. cinerascens, Leight.—Along with the type at High Beach.
Fertile (J. M. C). Now extinct.
P. ciliaris, L. — On trees near Walthamstow. Fertile
(Hb. E. F.). I have not seen this species, which is now
extinct in the Forest.