72 BERNT LYNGE. M.-N. Kl. 



In our herbarium there are some plants of this tribus which have 

 rather elongate, appressed laciniae, with a few lateral soredia and much 

 the habitus of our Ph. obscura. On the other side they approach quite 

 as near to plants which undoubtedly belong to Ph. virella. Authors dis- 

 agree as to the question whether Ph. obscura is or is not sorediate. I 

 agree with CROMBIE, describing Ph. obscura (and his Ph. ulothrix) as esore- 

 diate ', I have accordingly referred the above mentioned plants to Ph. 

 virella (juvenile specimens). 



Some authors have described a f. chloantha SCHAER. with pale thallus, 

 and reserved the name cycloselis for darker coloured plants. These forms 

 occur in Norway, the latter most frequently, but they are insignificant and 

 hardly worthy of a name. 



ii. Physcia virella (ACH.). 



Lichen virellus ACHARIUS Prodromus (1798) p. 108. 



Parmelia virella ACHARIUS Methodus (1803) p. 201. 



Lecanora virella ACHARIUS Lich. Univ. (1810) p. 414. ACHARIUS Synopsis 

 (1814) p. 191. 



Parmelia (Lichen) cycloselis b. virella SOMMERFELT Supplem. Florae 

 Lappon. (1826) p. 109. 



Parmelia obscura j] leprosa SCHAERER Enumeratio Critica (1850) p. 38. 



Anaptychia obscura y. nigricans MASSALONGO Memorie Lichenographiche 

 (1855) p. 58. 



Rinodina virella KOERBER Syst. Lich. Germ. (1855) p. 124. 



Rinodina leprosa (SCHAER.) MASS. KOERBER Parerga Lichenol. (1865) 

 p. 72. 



Parmelia obscura var. virella TH. FRIES Lich. Arctoi (1860) p. 65. 

 NYLANDER Lich. Scand. (1861) p. 112. TH. FRIES Lich. Scand. I (1871) 

 p. 142. LEIGHTON Lich. Flora Great Brit. (1879) p. 137. OLIVIER Etude 

 sur les . . . . Physcia etc. (1894) p. 90. OLIVIER Lichens d'Eur. I (1907) 

 p. 244. HARMAND Lichens de France (1909) p. 645. LYNGE Blad- og 

 busk-laver Berg. Mus. Aarb. 1910, no. 9, p. 101. 



Physcia ulothrix var. virella CROMBIE Brit. Lich. I (1894) P- 3 2 - 



Physcia orbicularis (NECK.) TH. FR. c. virella DALLA TORRE et SARNT- 

 HEIM Die Flechten von Tirol (1902) p. 166. 



1 CROMBIE Brit. Lich. I, p. 318 319. 



