167 



LICHEXOLOGICAL MEMORABILIA.— No. 7. 



Bij the Rev. W. A. Leighton, B.A., Camb., F.L.S., F.B.S.Ed: 



ADDITIONS TO THE LICHEN-FLORA OF GREAT BRITAIN, &c. 



I judge it right to place on record an estimate which I have this 

 day (March 8, 1875) made of the additions to our Lichen-Flora, 

 since the publication of the second edition of my " Lichen-Flora " 

 in 1872. These additions comprise genera, species, varieties, and 

 forms or states, and amount, so far as my present knowledge extends, 

 to 200 in number, thus raising the number of British lichens to 

 very nearly a thousand. The fact manifests that the number of 

 students of lichens is greatly on the increase. For these additions 

 we are chiefly indebted to the careful and painstaking researches and 

 observations of Rev. J. M. Crombie in Scotland and various parts 

 of England, Mr. Larbalestier in the Channel Islands, Mr. Curnow 

 at Penzance,' Mr. Joshua in Gloucestershire, Mr. Martindale in 

 Westmoreland, and my own wanderings in Shropshire and adjacent 

 counties, and in Noi'th and South Wales. 



Brought forward 52 



Physcia 1 



Umbilicaria ... ... ... 1 



Pannaria ... ... 2 



Squamaria ... ... ... 3 



Placodiutn ... 2 



Lecanora 38 



Pertusaria 2 



Lecidea ... ... 71 



Xylographa ... ... ... 4 



Ptychographa 1 



Opegrapha 7 



Arthonia ... ... 4 



Melaspilea 1 



Thelocarpoa ... 2 



Verrucaria 8 



Obryzum ... ... ... 1 



52 Total 200 



On the Characters of Peltigera canina, P. malacea, 



AND P. RUFE8CENS. 



Mr. Crombie in litt. has very properly and kindly called my 

 attention to No. 361 of my Lichenes Britannici Exsiccati, collected 

 on the High Rock, Bridgnorth, Shropshire, and labelled P. rufes- 

 cens, by stating that " your No. 361 in Herb. Carroll in Brit. Mus. 

 from High Rock, Bridgnorth, is not Peltigera rufescens, but P. 

 malacea, with young apothecia, and otherwise not very typical (as 

 thallus is here and there discoloured) but sufficiently clear. No 

 doubt widely distributed in subalpine districts of W. Britain, but 

 rare." I must candidly confess that my notions respecting P. ru- 

 fescens have been hitherto very muddled and confused, but now 

 that my attention has been aroused to a more careful and special 

 examination of the specimens in my herbarium, I at once observe 



