27
SUPPLEMENTAL REPORT ON THE LICHENS
OF EPPING FOREST.
By ROBERT PAULSON. F.L.S. F.R.M.S., and PERCY G. THOMPSON, F.L.S.
[Read 25th January 1919.]
WHEN, on 24th February 1912, We read before the Club
our Second Paper on the Lichens of Epping Forest,
we expressed the opinion that we were then, with a record of
109 forms, nearing, in all probability, the limit of the present-
day lichen-flora of the Forest district. This forecast has proved
to be not inaccurate.
Since 1912, we have met with some twenty additional forms
only to those previously recorded by us ; and it seems desirable
to complete our Report by adding these to our published
lists.1 The new records are as follows :—
Chaenotheca melanophaea. Zwackh.,
var. flavocitrina, Pauls.
On oak-trunk, to N. of Great Monk Wood : fertile.
Coniocybe furfuracea, Ach.
On hedge-bank at Oak Hill, Theydon Bois : fertile.
Cyphelium stigonellum, A. Zahlb.
On thallus of Pertusaria on oak-trunks near Shingle
Hall, Epping Upland, near "Wake Arms," and near
Wake Valley Ponds : fertile.
Collema glaucescens, Hoffm.
On wet clayey ground, Pinner's Green, Highbeach :
fertile.
Peltigera rufescens, Hoffm.
var. praetextata, Nyl.
On ground near Dulsmead Hollow, in old gravel-pit at
Oak Hill, Theydon : sterile.
Placodium callopismum, Mer.,
On ragstone plinth, Great Parndon Church : fertile.
Placodium citrinum, Hepp.
On cement walls, Loughton Sewage Farm : fertile.
Physcia pulverulenta, Nyl.
form subvenusla, Oliv.
On elm-trunk near Hayles Farm, Epping Upland : sterile.
1 See Essex Naturalist. xvi. (1911), pp. 136-1,15 ; op. cit., xvii. (1913). pp. 90—105.