+» 255 
WEST LANCASHIRE LICHENS. 
By J. A. WueE.pon, F.L.8. _& Atsert Wizson, F.L.S, 
Tus preliminary. account of the lichens of West Lancashire is 
ie with a double object, viz. to place on record such species 
have hitherto been detected, and to invite the aid of other 
bobadiists in determining what further species the dish yields, 
and ascer taining how they are distributed in the vice-county. 
e have divided West Lancashire, for the Se of our pro- 
jected fava. into three principal divisions. A condensed description 
of these will be found in this Journal for the year 1899, p. 465. It 
will suffice here to state that the numbers 1, 2, and 3 refer to the 
enumerated have been found by the authors, either jointly or in- 
dividually. The only published notes we have been able to find 
are a few incidental Eat to West Lancashire localities in 
Mr. Martindale’s papers on Westmorland Lichens, which appeared 
in the Naturalist, 1886, p. rae and one or two old records given in 
Leighton’s Lichen Flora, e 
The lichens in a lice pe of West Lancashire present some 
difficulty to the student, as many of them (especially corticolous 
species) are poorly de tha and igi do not exhibit well 
their characteristic features. In the more favoured localities of the 
north and east, where they are least anaes to the adverse influence 
of smoke, ‘hay attain greater luxuriance, and even fruit freely. As 
with the mosses, tle rupestral species are better represented than 
those which grow on trees. The Scar-limestone yields a number 
of Collemacei and Peridei, and the Lecanorei here find their ra 
development. A few Pitetitig ‘forms appear to be restricted to 
the Silurian strata of the north-east. The grit and Yoredale 
; r than in West- 
On the peaty slopes of the fells Cladodei 
occur in profusion, and in endless variety. 
are much indebted to Mr. J. A. Martindale for Becta hints, 
and aléo for confirming or se. doubtful gatheri for af 
Without the advantage of his mate and critical kn knowledge of 
this difficult group of ‘plants, our "list would have been deprived of 
some of its most interesting items. 
The order followed is that of Crombie’s Br itish Lichens as far a 
Urceolaria. From thence the arrangement of Leena s Lichen 
Flora of Great Britain i is adhered to. 
Collema oe Ach. 1. Silverdale.—C. eee at 1. On 
d B 
mossy tree near Henridden.—C. pulposum Ach. 1. Banks near 
Yealand.—C. ot caliper um Nyl., 1. Silverdale ; So ap, Ease- 
gill Kirk.—C. melenum Ach. f. marginale Ac sh. 1: Yealand d and 
Dalton Crag, near Henridden.—C. multipartitum Sm. 1, Silver- 
