On the Lichen-Flora of Epping Forest. 55
Lichen virellus.
,, epipolius,
,, umbrinus.
,, abietinus.
,, lutescens.
,, contiguus.
,, fusco-ater.
,, cerinus.
,, capitatus.
,, lynceus.
,, lightfootii.
,, caesius.
,, luteus? ?
,, jubatus.
,, physodes.
,, borreri.
Lichen corrugatus.
,, agelaeus.
Opegrapha notha.
,, nimbosa.
,, astroidea.
,, pulverulenta.
Arthonia swartziana.
Lichen fragrans.
Opegrapha microscopica.
Lichen salicinus.
Baeomyces caespiticius.
Urceolaria cinerea.
Lecidea luteola.
,, luteoalba.
,, viridescens.
,, cyrtella.
This therefore gives a total of fifty-five species known to
occur in the Forest, though several of them were erroneously
named, at the time when the latter of these lists was written.
When this was, however, is quite uncertain, though, as may
be inferred from the MS., additions were entered as they
occurred at different dates. At the same time, as his her-
barium contains a far larger number of species and varieties
with a more modern nomenclature, most of them were no
doubt inserted not many years after the publication of the
'Botanist's Guide.' Unfortunately Forster does not, unless
in a few instances, give the date at which he collected the
specimens in his herbarium, which, after his death in 1849,
was deposited in the British Museum, and is now incorporated
with the General British Herbarium in the Botanical Depart-
ment. From the time of Forster no attention was paid to
the lichens of the Forest until the years 1865-68, when
I made repeated excursions to it, and added upwards of
twenty-five species and varieties, some of which were recorded
in my 'Enumeratio Lichenum Britannicorum' (1870), to
those formerly collected. During the last two autumns also
I have again, for the purpose of this paper, revisited most
parts of the Forest, and observed a few things previously
overlooked. In the following systematic enumeration I have
recorded all the species and varieties, with their habitats