406 Rev. W. A. Leighton on the Determination 6f the 



Lower Austria (Dr. Holzinger), Algeria (Mr. G. Bentham), 

 Genoa (Prof. DeNotaris) ; and, in Great Britain, from Gilton 

 Point, Tenby, South Wales, and Haughmond Hill, Shropshire. 



2. C. cervicornis, Schser. (E. Bot. t. 2574) = Schser. L. H. 

 457 ; M. & N. 749 ; Bohl. Br. Lich. 88 ; Anzi, C. C. 12, 18, 19 ; 

 Mudd, L. Br. 9. 



Under this name two plants, alike externally, have been com- 

 prised hitherto, but must now be separated as distinct species. 

 The one has the reaction K +, the other is destitute of reaction, 

 •K — . Dr. Nylander {in lift.) informs me that the C. cervicornis 

 of Delise^s herbarium in the Jardin des Plantes, Paris, has K + , 

 whilst the C. sobolifera of the same herbarium has K— , 

 and to this latter Coem. CI. Belg. 14, 15, 16 are referable. 

 The C. cervicornis K+ is, of course, kept distinct from gracilis 

 and verticillata by the reaction. 



I possess this plant also from Bruyeres (Schserer), from 

 Gotteborg and Christiania and Klippan, from FAbbe Coemans (as 

 " C. degenerans v. hasima, Nyl. L. Scand. 54"), and from Shrop- 

 shire, Yorkshire, and Barmouth, North Wales. 



3. C. cariosa, Flk. (E. Bot. Suppl. t. 2761) = Fr. L. S. 149 (fide 

 specim. a Nyl.); Fellm. Lapp. 27; Coem. CI. Belg. 20; M. & 

 N. 850; Massal. L. Ital. 54; Anzi, C. C. 4; Hepp. 541,542; 

 Schser. L. H. 510; Richardson, Arctic Amer. Lich. 10. 



I possess this also from Upsal (Dr. T. M. Fries), Holm (Dr. 

 Nylander), and from near the 49th parallel of latitude, Oregon 

 Boundary Commission (Dr. Lyall). 



The reaction K+ keeps this quite distinct from C. pyxidata, 

 K — . 



4. C. lepidota (Ach.) = Fellm. Lapp. 35. This Acharian var. 

 of degenerans has K + , and, in Dr. Nylander's opinion, ought 

 probably to be distinguished as a distinct species. 



5. C. ecmocyna, (Ach.) Syn. p. 261 = Fellm. Lapp. 28, 29; 

 Anzi, C. C. IOa&b (in part); Schser. L. H. 65. 271. 



I have it also from Peklin (Dr. Harslingsky). Dr. Nylander 

 {in litt.) remarks that this species grows as far as Greenland and 

 Siberia. It is distinguished from gracilis by the reaction. 



6. C. dactylota, Tuck. = Wright's Lich. Cub. 30. Distin- 

 guished from fimhriata, gracilis, and botrytes by reaction (K + ), 

 but may be probably added as a form to ecmocyna. 



7. C. turgida, HofFm. = Fr. L. S. 147 (fide specim. a Nyl. & 

 T. M. Fries); Fellm. Lapp. 37; Tuck. L. Am. Sept. 24. 



This also may be added to ecmocyna as a state. 



8. C.pungens, Fr. (Dill. t. xvi. f. 30) = Fr. L. S. 318 (fide 

 Nyl.); Schffir. L. H. 459; M. & N. 754; Bohl. Br. Lich. 23; 

 Coem. 1035 ; CI. Belg. 189 ; Bourgeau, PI. Can. 605 ; Mudd, 

 Br. Clad. 54, 55, 56 ; Anzi, C. C. 24 ; Leight. Exs. 16. 369, 374 ; 



