Il8 CUMMINGS 



Thallus very thin, covered beneath with a network of 

 cream-colored veins .................... canina membranacca. 



Thallus thicker, veins dark-colored. 



Apothecia transversely oblong, veins blackening. 



horizontalis. 



Apothecia elongated, revolute, veins brown... polydactyla. 

 Surface of the thallus downy or granulate. 



Thallus granulate ........................................ .pulverulenta. 



Thallus downy. 



Thallus reddish-brown, crisped on the edges ....... rttfescens. 



Thallus greenish-gray or ash-brown, not crisped on the 



margins. 

 Thallus with distinct veins underneath ................... canina. 



Thallus covered with a spongy nap underneath. 



canina spongiosa. 

 140. Peltigera canina (L.) Hoffm. 



Lichen caninus LINNAEUS, Fl. Suec. noo. 1755. 



Peltigera canina HOFFMANN, Fl. Germ. 2 : 106. 1795. SOWERBY, Eng. Bot. 



Locality not given (Coville and Kearney, 576) ; Lowe Inlet, B. C. 

 (Trelease, 1089) ; Vancouver Island, Broughton Strait (Trelease, 

 1084) ; Yakutat (Trelease, 1065, 1065^) ; Aguadulce River, Yakutat 

 Bay (Trelease, 1064) ; Hidden Glacier Inlet, Yakutat Bay (Trelease, 

 1063, 1093*$) ; Disenchantment Bay, Yakutat Bay (Trelease, 1091, 

 1096, 1097, 1098); Juneau (Setchell, 1243, 1249); Muir Glacier 

 (Trelease, 1054, 11000) ; Farragut Bay (Trelease, no number) ; Orca 

 (Trelease, 1061) ; Port Wells (Trelease, 1056*:) ; Kadiak (Trelease, 

 1055, 1075) ; Agattu Island (Townsend, 76) ; Cape Fox (Trelease, 

 1070, 1085). Other Alaskan records are: Sitka, Port Mulgrave, 

 Unalaska, Port Chatham in Cook Inlet, Dr. Bean, collector; St. 

 Paul Island and St. George Island, collected by Macoun. Dr. Cooley 

 collected specimens at Salmon Creek, near Juneau, which are doubt- 

 fully referred to this species. Under the synonym Pelt idea canina 

 Ach., Babington reports its occurrence at Kotzebue Sound. 



With these specimens were fragments of Leptogium, Nephroma, 

 and other species of Peltigera. A number of the specimens are 

 sterile. 



141. Peltigera canina spongiosa Tuck. 



Peltigera canina spongiosa TUCKERMAN, Genera Lichenum 38. 1872. 



Alaska (Funston, 12); St. Paul Island (Trelease, 1086). Col- 

 lected by Macoun on St. Paul and St. George Islands. 



