294 DR. LINDSAY ON THE LICHEN-FLORA OF GREENLAND. 



Pannaria hypnoriim ; tripto- nalis ; decolorans, Fr, ; lu- 



phylla, Fr, cida, Fr, 



Squamaria straminea ; musco- Umbilicaria proboscidea ; hy- 



rum. perborea ; hirsuta ; anthra- 



Lecanora atra ; tartarea ; pal- cina, var. reticulata, Sch. 



lescens, Fr. ; oculata ; badia ; Pertusaria faginea. 



ventosa; exigua; aurantiaca; Endocarpon miniatum ; Isete- 



fusco-lutea, Hook. ^ Dicks. virens. 



Urceolaria scruposa. Verrucaria punctiformis, Pers. 



Thelotrema lepadinum. (= i^ar. of epidermidis). 



Lecidea parasema ; fusco-atra ; Pyrenothea leucocephala, var. 



confluens ; lapicida; varie- lecidina, Fr. (= Lecidea 



gata, Fr. ; rivulosa, Fr. ; abietina, Ach.) 



galbula ; Candida, Ach. ; ver- 



Nylander, in his ^' Enumeration generale des Lichens,"* pub- 

 lished in 1858, mentions in addition, — 



Siphula ceratites. Lecanora frustulosa, var. sub- 

 Platysma septentrionale, Nyl. ventosa, Nyl. ; subsophodes, 



Physcia aquila, Fr., var, com- Nyl. 



pacta, Nyl. Pertusaria concreta, Nyl. 



Umbilicaria arctica. Lecidea cinnabarina. 



In the Menziesian Herbarium (Edinburgh) I found the follow- 

 ing — labelled as collected by Richardson, but not included in 

 Leighton's list : — 



Alectoria ochroleuca (type). Umbilicaria hyperborea. 

 Parmelia conspersa. Lecidea fusco-lutea, Dicks, 



Peltidea scutata. 



While that of Kew contains the following — also collected by Sir 

 John — but in 1848-9, and not mentioned by Leighton : — 



Parmelia saxatilis,var. furfuracea. Umbilicaria proboscidea. 



Peltidea scutata. Placodium murorum. 



Physcia aquila, var. compacta ; Lecanora polytropa. 



parietina (type). Lecidea anomala. 



These omissions amount to 84 species and varieties, which, 

 added to Leighton's totals — 163 or 203 — give an aggregate of 247 

 or 287 ; the mean of the two estimates being 267 — a number that 

 may be said to equal the aggregate Greenland Lichen-flora — 268. 

 Both Nylander and Leighton found new species in the Arctic- 

 American Lichen-collections which they examined. What is 

 known as Arctic America comprises a very large area of country, 

 much of it wooded ; and there can be no doubt, I think, that if 

 its Lichens had been collected and studied with the same care as 

 those of Greenland or Spitzbergen, its Lichen-flora would have 



* "Memoires de la Societe Imperiale des Sciences Naturelles de Cher- 

 bourg," vol. V, 1857, p. 85. 



