XV11 



others in the North of Scotland, and of myself in North and 

 South Wales, have raised our Lichen-Flora to an equality in 

 numbers and rarity, with that of any other country in Europe. 

 The number of species and forms or varieties comprised in 

 the second edition of this work amounted to 1,156, whilst in 

 the present edition they have risen to 1,710, and may be tabulated 

 as follows : — 



Genus. 



Sirosiphon .... 

 Gonionema.... 



Kphebe 



Spilonema .... 



Lichina 



Pterygium .... 

 Leptogidium . 



Var. 

 Species or Total, 



Form 

 .. 1 — 



1 



1 

 3 

 2 

 2 

 1 

 1 



Pyrenopsis 8 



Oollema 27 



Leptogium 24 



Collemopsis 7 



Pyrenidium 1 



Myriangium 1 



Sphinctrina 3 



Calicium 18 



Coniocybe 3 



Trachylia 3 



Sphaerophoron 3 



Gomphillus 1 



BEeomyces 4 



Pyenothelia 2 



Cladonia 20 



Cladina 

 Pilophoron... 

 Stereoeaulon . 



Roccella 



Thamnolia ... 



Usnea 



Alectoria 



Evernia 



Bamalina ... 

 Oetraria 



4 

 2 

 7 

 3 

 1 

 1 

 6 

 2 

 13 

 3 

 Platysma 10 



Nephromium.. 

 Peltigera.. 

 Bolorina .. 

 Stictina .. 

 Sticta 



28 

 7 



4 

 1 



7 



8 



2 



13 



6 



5 

 4 

 4 



3 

 3 

 1 

 5 



2 



48 



11 

 2 



11 

 4 

 1 

 8 



14 

 4 



26 

 9 



15 

 7 



13 

 4 

 7 

 3 



Var. 

 Genus. Species or Total 

 Form. 

 Brought forward 



Eicasolia 2 



Parmelia 25 



Physcia 17 



30 

 26 

 11 



Umbilicaria 10 



Psoroma 1 



Pannaria 13 6 



Amphiloma 1 — 



Squamaria 6 5 



Placodium 13 5 



Lecanora 123 104 



Pertusaria 28 2 



Phlyctis 2 — 



Thelotrema 2 1 



Urceolaria 1 2 



Lecidea 397 147 



Odontotrema 2 — 



Schizoxylon 1 — 



Xylographa 4 2 



Ptychographa 1 — 



Agyrium 1 — 



Lithographa : 7 — 



Opegrapha 29 33 



Platygrapha 1 



Stigmatidium 5 



Arthonia 34 



Graphis 10 



Chiodecton 1 



Glyphis 1 



Melaspilea 4 



Mycopormn 3 



Bimularia 1 



Thelocarpon 4 



Normandina 2 



Endocarpon 4 



Verrucaria 157 



Strigula 1 



Melanotheca 3 



Astrothelium 1 



17 



31 



1 



5 

 25 



339 



2 



55 



43 



21 



1 



19 



1 



11 



18 



227 



30 



2 



3 



3 



544 



2 



1 



6 



1 



1 



7 



62 



1 



5 



51 



41 



2 



1 



4 



3 



1 



4 



2 



9 



182 



1 



3 



1 



Carried forward... 339 Total L 1710 



I have purposely omitted any mention of the Schwendenerian 

 Theory of Lichens, as I cannot but regard it as purely imaginary, 

 " the baseless fabric of a vision ; " which even if it could be 

 proved to be true, which is not yet the case, cannot make lichens 

 to be less lichens, nor interfere with their systematic study. 



It will be well for us ever to bear in mind the sound remarks 

 which Mr. Bentham embodied in 1872 in one of those admirable 

 addresses which, as President of the Linnsean Society, he annually 

 delivered. " There is a very common readiness to take at once 

 as proved any paradox, or theory, opposed to general belief, when 



