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



first category includes Lichens tliat are more peculiarly American ; 

 the second those which are characteristically Scandinavian.* 



In Arctic America there are four genera that are unrepresented 

 in Greenland, viz., Odontotrema^ Gyrostornum^ Xylographa, and 

 Graphis ; and the following species : — 



Nostoc commune.f 



Cladonia cornuta ; cariosa ; 



pityrea. 

 Usnea barbata ; lacunosa. 

 Ramalina calicaris. 

 Evernia Prunastri. 

 Nephromium tomentosum. 

 Platysma Richardsoni ; lacu- 



nosum. 

 Sticta herbacea. 

 Physcia ciliaris ; candelaria. 

 Umbilicaria pustulata ; Muh- 



lenbergii. 



Squamaria ambigua. 

 Lecanora fulvo-lutea. 

 Pertusaria leioplaca. 

 Lecidea coarctata ; vesicularis; 



tessellata ; chalybeia ; pro- 



trusa ; parasitica. 

 Verrucaria Frankliniana ; ni- 



grescens ; glabrata. 

 Odontotrema Richardsoni. 

 Gyrostomum urceolatum. 

 Xylographa flexella. 

 Graphis serpentina. 

 Arthonia intumescens. 



There is, however, a much larger number of Lichens belonging 

 to the Greenland flora, and for the most part to that of Scandi- 

 navia, that do not occur in Arctic America. These include, 

 besides the new forms found in Brown's Collection, the follow- 

 ing species enumerated in the present Catalogue of Greenland 

 Lichens : — 



Lecidea — all except geogra- 



phica ; sanguineo-atra : dis- 



ciformis ; atro-brunnea ; tur- 



gidula ; sabuletorum. 

 Lecanora — all save vitellina ; 



cerina ; cinerea ; parella ; 



subfusca; glaucoma; oreina; 



turfacea ; varia ; bryontha ; 



smaragdula ; verrucosa. 

 Parmelia — all save physodes ; 



saxatilis ; olivacea ; lanata ; 



stygia. 

 Umbilicariix — all except vellea; 



cylindrica ; erosa. 

 Squamaria — all save elegans ; 



chrysoleuca; saxicola. 

 Stereocaulon — all save tomen- 

 tosum. 

 Verrucaria — all except epider- 



midis. 



Ephebe — all. 

 Endocarpon — all. 

 Sticta — all. 

 Urceolaria — all. 

 Sphserophoron — all. 

 Pyrenopsis — all. 

 Arthonia trabinella. 

 Pannaria lepidiota ; Hookeri. 

 Cetraria aculeata ; odontella. 

 Cladonia bellidiflora ; digitata ; 



carneola ; cyanipes ; verti- 



cillata; cervicornis. 

 Collema flaccidum ; melaenum ; 



lacerum. 

 Usnea melaxantha. 

 Alectoria Thulensis. 

 Solorina crocea. 

 Peltidea scabrosa. 

 Nephroma arcticum. 



* So far as we may venture to judge from the present imperfect data, it 

 ■would appear that the affinities of the Greenland Lichen-flora are greater 

 towards that of Scandinavia, and generally of Europe, than to that of 

 America. 



t This may he included in lists of Greenland Algce. Berkeley (in 

 "Treasury of Botany ") places iVosfoc, and *' Falling stars," among Al gee. 



