—55— 



species from Belmont and Dismal River, Nebraska. This record was based on 

 determinations made by Underwood, who soon afterwards catalogued the plant 

 from British Columbia without giving definite localities.^ A few years later, 

 the writer listed it from Yakutat Bay, Alaska, on the basis of specimens collected 

 by Coville and Kearney, while members of the Harriman Expedition.^ In 1902, 

 J. Macoun^ brought together all the records he could find from Alaska and Canada, 

 including one from Huntingdon, Ontario, another from Lake Louise, near Lag- 

 gan, Alberta, and a third from the vicinity of Griffin Lake, Gold Range, British 

 Columbia, These three records were based on specimens collected by himself 

 and determined by Underwood, and it is probable that the earlier record from 

 British Columbia referred to the Gold Range specimens. 



At the time that most of these records were published, P. Flotowiana (Nees) 

 Lindb. was considered synonymous with P. hihernica, although certain writers 

 recognized it as a variety. In 1899, however, Warnstorf* expressed the opinion 

 that the diff"erences between them were sufficient to justify a specific separation, 

 and this view is now held by many recent writers. In 1904, the writer reported 

 P. Flotowiana from Massachusetts^ and referred to this same species the Alaskan 

 specimens which he had previously called P. hihernica. Since that time, the 

 specimens from Nebraska, Ontario, Alberta, and the Gold Range have been 

 examined, and these seem also to belong to P. Flotowiana rather than to P. 

 hihernica. The only records now left for the species are the one from Newfound- 

 land, which ought to be further investigated, and the new one from British 

 Columbia noted above. In northern Europe, P. hihernica has a wide distri- 

 bution, although nowhere abundant. 



The differences between P. hihernica and P. Flotowiana are clearly given by 

 Warnstorf and also by Miiller^ and are almost entirely drawn from the vegetative 

 characters of the gametophytes. In P. hihernica the midrib of the thallus,. 

 which is triangular in section, is 8-14 cells thick in the middle, while the wings 

 are plane or nearly so. In P. Flotowiana, on the other hand, the midrib, 

 which is trapezoidal in section, is 16-22 cells thick, and the wings are more or 

 less crispate. Brinkman's specimens resemble slender forms of P. Lyellii and 

 have a similar odor. They are characterized, however, by the frequent forking of 

 the thallus and by the fact that the midrib is uniform in texture. In P. Lyellii 

 the thallus almost invariably branches in an intercalary manner from the lower 

 surface of the midrib, while the latter is traversed by a median strand of narrow 

 elongated cells. 



2. Nardia Geoscyphus (De Not.) Lindb. 



Collected in May, 1910, near Yarmouth, Nova Scotia, on earth along a 

 roadside, by J. Macoun {No. 4j). The species is new to eastern Canada but has 



1 Zoe 1: 365. 1891- 



2 Proc. Wash. Acad. 2: 291. 1900. 



3 Cat. Canadian Plants 7 : 8. 1902. 

 '^Allgem. Bot. Zeitschr. 1899: 15. 



^ Rhodora 6: 165. 1904. 



^ Rabenhorst's Kryptogamen- Flora d: 359- 1908. 



