CUMMINGS 
IO4 
Apothecia medium size. 
Disk of apothecium shining brown. 
subfusca argentata. 
Disk of apothecium pruinose ... .pacifca. 
Thallus not smooth, dirty white or yellowish. 
Margin of apothecia reflexed. varia symmicta. 
Margin of apothecia not reflexed. 
Thallus of rounded, turgid warts. .frustulosa. 
Thallus contiguous, clunky. 
Apothecia rather small, margin entire. subfusca. 
Apothecia medium size, margin flexuose and cren- 
ate. subfusca allophana. 
Spores very large. 
Thallus chinky or plicate... pallescens. 
Thallus not chinky, either tartareous, granulate, or nodulose. 
Lobes of the thallus short............. tartarca. 
Lobes of the thallus elongated. 
Thallus finely divided. tartar eafrigida. 
Thallus coarsely divided. ....tartarca pterulina. 
94. Lecanora privigna revertens Tuck. 
Lecanora privigna revertens Tuckerman, Syn. N. A. L. 1 : 204. 1882. 
Kadiak (Trelease, 900 in part). New to Alaska. 
With Buellia gcographica , Lecanora varia intricata , and Per- 
tusaria communis. This variety has been collected in California by 
Bolander. 
95. Lecanora cinerea (L.) Smrft. 
Lichen cinereus Linnteus, Mant. 132. 1767. 
Lecanora cinerea Sommerfeldt, Suppl. Lapp. 99. 1826.— Sowerby, Eng. 
Bot. t. 1751. 
Summit of White Pass, 3000ft. (Trelease, 951 in part); Kadiak 
(Trelease, 945) ; Port Clarence (Trelease, 941). All on rock. Col¬ 
lected by Dr. Bean at Port Clarence, Icy Cape, and Cape Lisburne. 
The specimen from White Pass, which is mixed with Buellia geo¬ 
graphical differs from tliemore common form, in that the thallus is 
not continuous, but broken into areoles. The specimen from Port 
Clarence has the apothecia urceolate, and sometimes white pruinose. 
Interspersed in the thallus are reddish-gray, granulose warts. This 
is a very variable and widely distributed species, which has been 
classified under several generic names. Common in Greenland and 
in alpine and arctic regions. 
