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, FI. Ang. ed. 2. 526. 1778. 
Placodium ferrugineum Hepp, Sporen der Flechten Europas. 1853.— 
Sowerby, Eng. Bot. t. 1650. 
Alaska (Dr. Kellogg, no number); Sitka (Trelease, S25C) ; 
Yakutat (Trelease, S31); Farragut Bay (Trelease, S29) ; St. Law¬ 
rence Island (Trelease, S32 in part). A lichen of wide distribution; 
reported by Tuckerman as having been collected in Alaska b)' 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 ccesiorzifa (Ach.). 
On bark and dead wood. The specimen from St. Lawrence Island 
is on bark, with Lecidea melancheima. The specimen from Sitka is 
very small and is associated with Lecidea enteroleuca. 
124. Placodium jungermanniae (Vahl) Tuck. 
Lichen jungermannice Vahl, Nat. Selsk. Sk. 2: 29. 
Placodium jungermannice Tuckerman, Syn. N. A. L. 1: 176. 1882. 
LTnalaska (Setchell) ; St. Matthew Island (Trelease, S66 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. t. 627. — Hedw. Stirp. Crypt. 2: 62. t. 21. f B. 
Kukak Bay (Kincaid, 836a in part); Kadiak (Trelease, 1134). 
The locality given for this in Dr. Rothrock’s list is Icy Cape, Arctic 
