LICHENS 121 



being given. Dr. Cooley collected it at Loring and at Sheep Creek, 

 near Juneau ; Macoun adds St. George Island and St. Paul Island to 

 the list of localities. Under the synonym Peltidea apthosa Ach., 

 Nylander credits it to Port Clarence ; in the lists of Hooker and Arnott, 

 and Babington, it is reported from Kotzebue Sound. 



There is great difference in the size of the fronds in the different 

 specimens. No. 1040, from Hot Springs, is characterized by very long 

 and narrow lobes, the specimen being sterile. The three fertile spec- 

 imens, 1053, 1062, and 1076, are all small. 



149. Peltigera venosa (L.) Hoffm. 



Lichen venosus Linnaeus, F1. Suae. ed. 2. 1097, 1755. 



Peltigera venosa Hoffmann, PI. Lich. /. 6.f. 2. 1790-1 801. — Sowerby, Eng. 

 Bot. /. 887. 



Juneau (Setchell, 1242) ; Hidden Glacier Inlet, Yakutat Bay (Tre- 

 lease, 1077, 1105); Unalaska (Setchell). Fertile. Collected by 

 Wright on the islands of Bering Strait. In Rothrock's Flora of 

 Alaska it is credited to Kotzebue Sound, under the synonym Peltidea 

 venosa (L.) Nyl. Babington records its occurrence at Kotzebue 

 Sound ; Nylander lists it as collected at Port Clarence. 



Other Alaska species of the genus are : P. scabrosa Fr., reported 

 by Nylander from St. Lawrence Island and Port Clarence ; P. canina 

 sorediata Schaer., collected by Wright on banks of islands in Bering 

 Strait ; and Peltidea polydactyla scutata Fries, reported by Babington 

 as having been collected at Kotzebue Sound. 



NEPHROMA. 



KEY TO THE SPECIES. 



Thallus greenish straw-colored arcticum, 



Thallus brown. 



Thallus tomentose beneath tomentosum. 



Thallus naked. 



Thallus not sorediate Icevigatum. 



Thallus sorediate Icevigatum parile. 



150. Nephroma laevigatum Ach. 



Nephroma Icevigatum AcHARius, Syn. 242. 18 13. — Sowerby, Eng. Bot. /. 

 305- 

 Juneau (Setchell, 1244) ; Sitka (Trelease, 1072) ; Yakutat Bay 

 (Trelease, 10650;, 1092, iioo in part) ; Virgin Bay (Trelease, 1073) ; 

 Port Clarence (Trelease, 107 1, 1087c) ; Cape Nome (Setchell). New 

 to Alaska. 



