112 CUMMINGS 



from Plover Bay, Siberia, and Sitka, which is on Baranof Island. 

 Thus the localities are practically identical. Nylander, in Lich. Fr. 

 Behr., records it from Konyam Bay and Bering Island, Siberia. 



Several specimens show new thalli forming on the decaying rem- 

 nants of old thalli. 



122. Placodium fuscoatrum (Bayrh.). 

 Lecanora fuscoatra BAYRHOFFER, Zw. Exs. 96. 



Kadiak (Trelease, 949). On rock. New to Alaska and to 

 America. 



123. Placodium ferrugineum (Huds.) Hepp. 



Lichen ferrugineus HUDSON, Fl. Ang. ed. 2. 526. 1778. 



Placodium ferrugineum HEPP, Sporen der Flechten Europas. 1853. 

 SOWERBY, Eng. Bot. /. jrdjo. 



Alaska (Dr. Kellogg, no number) ; Sitka (Trelease, 825*;) ; 

 Yakutat (Trelease, 831); Farragut Bay (Trelease, 829); St. Law- 

 rence Island (Trelease, 832 in part). A lichen of wide distribution; 

 reported by Tuckerman as having been collected in Alaska by Dr. 

 Kellogg. Rothrock reports its occurrence at Port Clarence, as de- 

 termined from the collection of Dr. Bean; Nylander states in his 

 correction of Rothrock's list that this specimen should be named 

 Lecanora ccesiorufa (Ach.). 



On bark and dead wood. The specimen from St. Lawrence Island 

 is on bark, with Lecidea melancJieima. The specimen from Sitka is 

 very small and is associated with Lecidea enteroleuca. 



124. Placodium jungermanniae (Vahl) Tuck. 



Lichen jungermannia; VAHL, Nat. Selsk. Sk. 2: 29. 



Placodium jungermannia TUCKERMAN, Syn. N. A. L. i : 176. 1882. 



Unalaska (Setchell) ; St. Matthew Island (Trelease, 866 in part) ; 

 St. Michael (Setchell). Collected on the islands of Bering Strait by 

 Wright ; Nylander reports it from St. Lawrence Bay, Konyam Bay, 

 and Bering Island, all on the Asiatic side of Bering Strait. 



The St. Matthew specimen was growing on moss, with Rinodina 

 turfacea and the sterile thallus of a Pertusaria; the St. Michael speci- 

 men was on moss, with Rinodina turfacea and Biatora hypnophila. 



125. Placodium cerinum (Ehrh.) Naeg. & Hepp. 



Lichen cerinus EHRHART, Plant. Crypt, n. 216. 1785. 



Placodium cerinum NAEGELI & HEPP, Sporen der Flechten Europas. 1853. 

 SOWERBY, Eng. Bot. /. 627. HEDW. Stirp. Crypt. 2: 62. /. 21. f. B. 



Kukak Bay (Kincaid, 836^ in part); Kadiak (Trelease, 1134). 

 The locality given for this in Dr. Rothrock's list is Icy Cape, Arctic 



