186 



often been referred to the var. orthothecioides of this species, and 

 Grimmia gracilis var. rufescens is doubtless identical with f. riifes- 

 cens Limpr. 



The Færoes possess in common with Britain 338, with Norway 

 330, with Iceland 229 and with N. America 271 species and varieties. 



Indigenous in Britain and the Færoes, but not met with 

 in Iceland and Norway are: — 



Lejennea microscopica, Mollia tortilis, 



Mastigophora Woodsii, Barhula brevifoUa, 



Jamesoniella Carringtonii, — — var. aciitifolia, 



Metzgeria hamata, — reftexa, 



Brijiim fallax, — fallax, 



Diphysciiim sessile var. aciitifolia, Dichodontium flavescens, 



Pottia criniia, Glijphomitriiim Daviesii, 



Mollia flavouirens, Amblystegiiim eugyriiim var. Ma- 



— brachydontia, ckayi. 



Of these 17 four are c, 3 w. c. and 10 Atl. All attain their nor- 

 thern limit in the Færoes. 



A single species, Dicramim Anderssonii, has hitherto only been 

 found in Lapland (ab. 67^ N. lat.). 



The following have been found in Iceland and Norway, but 

 probably not in Britain: — 



Jiingermania obtiisa, Bryiim micans, 



— Wenzelii, — retusiim, 



— atlantica, — lapponicum, 

 Nardia siibelliptica, Dicranum albicans, 

 Astrophylhim medium, Philonotis Ryani, 



whereof 1 c, 2 w.c, 3 alp.arct. and 4 (Jungermania atlantica, Bryiim 

 retiisum, B. lapponicum and Philonotis Ryani) Atl. Jungermania 

 atlantica and Philonotis Ryani first attain here their northern limit 

 of distribution. 



The following have been found in Britain and Norway, but 

 not as yet in Iceland: — 



Frullania Tamarisci var. ro- Lejennea cavifolia var. plani- 



busta, usciila, 



n.l. — Jackii, n.l. Radula aqiiilegia, 



Lejennea calcarea, — commiitata, 



nX — patens, n.l. Porella Thiija, 



