100 CUMMINGS 



where it was collected by Hall ; its most southern record is Florida. 

 It occurs also in tropical America, Japan, and Australia. 



84. Pertusaria communis DC. 



Lichen pertusa Hoffmann, Enum. 16. /. 3. f. 3. 

 Pertusaria communis De Candolle, F1. Fr. 2 : 320. 1805. 



Kadiak (Trelease, 897 and 900 in part, 917, 947, 948, 981) ; St. 

 Michael (Setchell). 



On rocks associated with various species of Lecanora^ Lecidea^ and 

 Buellia. As listed by Rothrock it occurs also at Port Clarence, Cape 

 Lisburne, and Port Althorp. 



85. Pertusaria cameo-pallida (Nyl.) Nyl. 



Lecidea cameo-pallida Nylander in Bot. Notis. 183. /. 833. 1853. 

 Pertusaria cameo-pallida Nylander, Lich. Fr. Behr. 65. 1888. — Sowerby, 

 Eng. Bot. t. 2010. 



Disenchantment Bay, Yakutat Bay (Trelease, 802, 803, 820). On 

 bark. Reported from Port Clarence by Nylander. 



A lichen which is common in Scandinavia and other European 

 countries, but whose only other American station is Port Clarence, as 

 noted above. 



86. Pertusaria dactylina (Ach.) Nyl. 



Lichen dactylinus AcHAKivs, Prod. 89. 1798. 

 Pertusaria dactylina Nylander, Lapp. Or. 240. 1867. 



Alaska (Trelease, 921). 



Sterile, on the earth. Reported by Nylander from Port Clarence; 

 by Rothrock from Alaska Peninsula, collected by Dr. Bean ; and by 

 Tuckerman from the islands of Bering Strait, where it was also col- 

 lected by Wright. 



A strictly alpine and arctic species. 



87. Pertusaria multipuncta (Turn.) Nyl. 



Variolaria multipuncta Turner, Trans. Linn. Sec. 9 : 137. 1808. 

 Pertusaria multipuncta '^Yi.KHTfE.K, Not Sallsk. F. 1857. 



Yakutat (Trelease, 804) ; Sitka (Trelease, 812). New to Alaska, 

 On bark. No. 812 is sterile, but is without doubt referable here. 



Common throughout the United States. 



In addition to the species of Pertusaria given above, several sterile 



specimens were collected. One of them may probably be referred to — 



88. Pertusaria rhodocarpa Koerb. 



Pertusaria rhodocarpa Koerber, Syst. Lich. Ger. 384. 1855. 

 Farragut Bay (Trelease, 806). 

 Another may well be referred to — 



