288 CARDOT AND THERIOT [3 2 8] 



From Juneau (Canby, 436 in part) ; Wrangell (Trelease, 1652) ; 

 Orca (Trelease, 1732; Coville and Kearney, 1306 in part); Kodiak 

 (Trelease, 1847) ; Prince of Wales Island (J. M. Macoun) ; Yes 

 Bay (Gorman, 182, with a slender, elongated male form of Dicranella 

 heteromalla) . 



Pogonatum urnigerum Pal. Beauv. Prodr,, p. 84. 



From Hidden Glacier Inlet, Yakutat Bay (Trelease, without num- 

 ber) ; Disenchantment Bay (Trelease, 1655) ; Hubbard Glacier (Co- 

 ville and Kearney, 1072) ; Muir Glacier (Trelease, 1660). 



Pogonatum alpinum Rcehl. in Ann. Wett. Ges., in, p. 226. 



From Alaska, sine loco (W. H. Evans in 1897) ; Juneau (Canby, 

 without number; Trelease, 1680; Coville and Kearney, 560,581); 

 Yakutat Bay (Trelease, 1688; Brewer and Coe, 648); Point Gus- 

 tavus (Coville and Kearney, 792) ; Port Wells (Trelease, 1658, 

 1690); Orca (Trelease, 1691, 1692); Kukak Bay (Coville and 

 Kearney, 1605); Sitka (Trelease, 1685); Kodiak (Trelease, 1695); 

 Douglas Island (Trelease, 1683*5) ; Unalaska (J. M. Macoun) ; Attu 

 Island (L. M. Turner); Kiska Island (U. S. S. Albatross Exped., 

 9); St. Paul Island (J. M. Macoun; L. J. Cole; Trelease, 1661, 

 1699; Coville and Kearney, 1821); Hall Island (Trelease, 1663; 

 Brewer and Coe, 675) ; Plover Bay, Siberia (Trelease, 2545 ; Coville 

 and Kearney, 1860). 



Numerous forms, many of which pass to var. macounii. 



Pogonatum alpinum macounii var. nov. 

 P. macounii KINDB. in Bull. Torr. Bot. Club, xvi, p. 96. 



From Alaska, sine loco (W. H. Evans in 1897) ; Juneau (Setchell, 

 1 2 37)5 Foggy Bay, near Cape Fox (Coville and Kearney, 2573); 

 Prince of Wales Island (J. M. Macoun) ; Sitka (W. G. Wright, 

 1603). 



No precise limits exist between P. alpinum and P. macounii. 

 Kindberg attributes 60 lamellae to the leaves of his species, but 

 on the specimens which he sent to us we find only from 40 to 50 

 lamellae ; and, on the other hand, P. alpinum, to which he at- 

 tributes only 30 lamellae, often has 40. (Cfr. Barclay, Muscine"es de la 

 France, p. 198, and Limpricht, Laubmoose, n, p. 615.) There is no 

 other more constant difference between the two mosses. P. macounii 

 is therefore only a variety of P. alpinum, characterized by its greater 

 dimensions, its longer leaves, more widely spreading when dry and 

 usually provided with more numerous lamellae (40 to 50). This var. 

 macounii represents an extreme form of P. alpinum, of which the 



