THE MOSSES OF ALASKA 3OI 



Family DITRICHACE^. 



Ceratodon purpureus Brid. Br. univ., i, p. 480. 



Very common and variable. From Juneau (Setchell, 1233; Co- 

 ville and Kearney, 589 ; Trelease, 2175, 2177); New Metlakatla 

 (Trelease, 2240); Wrangell (Trelease, 2316); Port Clarence (Tre- 

 lease, 2106, 2107, 2108, 2109, 21 10, 2111, 2112; Brewer and Coe, 

 671) ; Cape Fox (Trelease, 1934) ; Yakutat Bay (Trelease, 2326, 

 2332); Disenchantment Bay (Coville and Kearney, 1065; Brewer 

 and Coe, 637) ; Muir Glacier (Trelease, 1801, 1804, 2443, 2446, 

 2447, 3 45°5 2 4^5) » O rca (Trelease, 2255, 2256) ; Bogoslof volcano 

 (Coville and Kearney, 2614 in part) ; Sitka (Coville and Kearney, 

 868; Trelease, 2361; Canby, 460); Kodiak (Trelease, 2189, 2198, 

 2212, 2224, 2226) ; Douglas Island (Trelease, 2393, 2404) ; Prince 

 of Wales Island (J. M. Macoun) ; Bering Island (J. M. Macoun) ; 

 Hall Island (Trelease, 2139) ; St. Paul Island (Trelease, i860, 2086) ; 

 Plover Bay, Siberia (Trelease, 2097, 2 53*i 2 53 2 > 2 53^? 2537, 2546; 

 Coville and Kearney, 1862). 

 Ceratodon heterophyllus Kindb. in Ott. nat., v, p. 179. Macoun, Cat. 



Can. pi., vi, Musci, p. 261. 



From St. Paul Island (J. M. Macoun; B. W. Evermann ; Tre- 

 lease, 2062, 2070, 2071, 2072, 2075). 

 Distichium capillaceum Br. eur., fasc. 29-30, p. 4, pi. 1. 



From White Pass (Trelease, 2310) ; Port Wells (Brewer and Coe, 

 653; Coville and Kearney, 1291 in part; Trelease, 2278, 2291); 

 Orca (Trelease, 1837, 1838, 2260 in part) ; Yakutat Bay (Brewer 

 and Coe, 644) ; Port Clarence (Trelease, 2104). 

 Ditrichum homallum Hpe. in Flora, 1S67, p. 182. 



From Kodiak (Brewer and Coe, 658 in part). New to Alaska. 



A slender etiolated form, of which we find only some stems among 

 other mosses ; leaves erect, costa narrower, basilar cells broader. 



Ditrichn?n Jlexicaule densum Sch. has, teste Rothrock, been recorded from 

 Alaska by Lesquereux and James, and D. glaucescens Hpe., teste Macoun, from 

 Unalaska, by Kindberg. Kindberg has also, teste Macoun, described a Lepto- 

 trichum tomentosum from St. Paul Island. 



Family POTTIACE^). 



POTTIA HEIMII BERINGIANA var. nov. 



(PL xiv, fig. 2 a -K) 



A forma typica differt foliis brevioribus, limbo lutescente circum- 

 ducts, costa breviter excurrente mucronatis reteque magis opaco valde 

 papilloso. 



