48 



projecting beyond the tips of the perichaetial leaves. Brotherus* 

 gives no further localities, Williamsf adding a North American 

 one in Port Wells, Alaska, where it was collected by Trelease 

 and identified by Cardot and Theriot.§ ParisJ had in the mean- 

 time included a couple other interesting localities: the Faroe 

 Islands and the isolated Arctic island of Jan Mayen. Authority 

 for the first of these was C. Jensen, who reported it|| from a 

 single locality on the island of Vaago. His two good plates 

 represent various details both of his own plants and the original 

 or type material of Wichura. The inclusion of Jan Mayen is 

 explained by the citation as a synonym of " Grimmia Jan May- 

 ensis Arnell, Bihang till K. Sv. Vet.-Akad. Handl., Bd. 26, Afd. 

 Ill, n. 13, t. V et VI." ^ Paris's citation is garbled, as is 

 frequently the case. The author of this species was P. Dusen, 

 who acknowledges assistance of both Arnell and C. Jensen in 

 determining his plants, but takes entire responsibility for the 

 new name. Plates V and VI belong not to this paper, but to the 

 work last mentioned. Dusen's article is however accompanied 

 by an unnumbered plate and a text-figure, both purporting 

 to illustrate his Grimmia Jan Mayensis. Of these the latter, 

 evidently executed by Dusen himself, may well represent 

 Dicranum Anderssonii,^ the plate executed by another ("Th. 

 Ekblom del.") is less clearly identified. 



I can report finding the species in Iceland in the summer of 

 1914, first on the eastern wall of the gorge Almannagja leading 

 down to Thingvellir (July 25), later on a lava-block in the vicinity 

 of the bridge over the glacial river Olfusa near the farmstead 

 Selfoss (Aug. 7). I find it also mixed with a specimen of Lophozia 

 alpestris taken from the lava by Hafnarfjordhur (Aug. 8). All 



* Engler und Prantl, Natiirl. Pflanzenfam., I, 3, 326. 1901; cf. however 453. 

 1902. 



t North American Flora, XV, 116. 1913. 



t Harriman Alaska Series of the Smithsonian Institution, V, 257ff. 1910, 

 reprinted from Proceedings of the Washington Academy of Sciences, IV, 297ff. 

 1902. 



§ Index bryologicus, 2 ed., II, 35. 1904. 



II Botany of the Faeroes, I58f, with plates V and VI. 1901. 

 If Pages i3ff. 1900. 



**Dusen was inclined to admit the synonymy of his new species after his atten- 

 tion had been called to the fact by Hagen; cf. Bihang till K. Sv. Vet.-Akad. Handl. 

 27, Afd. Ill, n. I, 57. 1901. 



