82 CUMMINGS 



L. epiphcza Nyl., Z. ramulosa Fr., L. atrorufa Ach., L. sanguine- 

 oatra (Fr.) Nyl., Z. pallidella Nyl., Z. ternaria Nyl., Z. j3a/- 

 //#//# Nyl., while Z. tornoensis Nyl. was collected at both localities. 

 In the second group are two species collected at Port Clarence on the 

 earth or on moss : Z. muscorum(Sw.) Nyl. and Z. subfuscula Nyl. In 

 the third group only two species are represented, one, L.fecunda Fr. 

 fil., collected on earth and moss at Port Clarence, the other, Z. pezi- 

 zoidea Ach., found in similar habitats both on St. Lawrence Island 

 and at Port Clarence. The fourth group is also represented by two 

 species Z. limosa Ach. and Z. dovrensis Nyl., the former on earth, 

 the latter on rock, at Port Clarence. In the fifth group are the follow- 

 ing species : Z. subnegans Nyl., Z. Candida Ach., Z. parasema, 

 forma euphora Flk., and Z. incongrua Nyl. The sixth group in- 

 cludes : Z. tenebrosa forma subsparsa Nyl., Z. laurentiana Nyl. 

 Z. brachyspora Fr., growing on rock on St. Lawrence Island ; Z. con- 

 tigua forma meiospora Nyl. and Z. crustulata (Ach.) Nyl., on rock, 

 collected at Port Clarence. Of the seventh group there is only one 

 representative Z. disciformis forma insignis Naeg. There are 

 three representatives of the eighth group : L. jemtlandica (Fr. fil.) , on 

 earth, St. Lawrence Island; Z. atroalbens Nyl., on rock, St. Lawrence 

 Island; and Z. chionea Norm., on rock, Port Clarence. In the ninth 

 group the following species are included : Z. confervoides (DC.) 

 Nyl., Z. atroccesia Nyl., Z. geminata Flot., Z. excentrica Ach., the 

 first three on rock on St. Lawrence Island, the last one on rock at Port 

 Clarence. The tenth group is represented by Z. alpicola Schaer., 

 growing on rock on St. Lawrence Island. The eleventh group con- 

 tains one species Z. rkexoblephara'Nyl., which was found on earth 

 on St. Lawrence Island. In the twelfth group are Z. sanguinaria 

 Ach., growing on the earth on St. Lawrence Island, and Z. ajfinis 

 Schaer., growing on the earth on St. Lawrence Island and at Port Clar- 

 ence. The thirteenth group is represented by Z. paraphanella Nyl., 

 on rock from St. Lawrence Island. The following species are given in 

 the body of the text, but not arranged in the foregoing groups : Z . as- 

 sociata Fr. fil., Z. hypopodia forma subassimilata Nyl., growing on 

 the earth on St. Lawrence Island, and Z. scabrosa Ach., growing 

 on the earth at Port Clarence. In addition to the list based upon the 

 specimens -collected by Dr. Almquist, Nylander revises Rothrock's * 

 list with the following changes : Z. spilota Fr. = Z. plana Lahm. ; 

 Buellia petrcza = Lecidea geminata Flot.; Z. enteroleucodes Nyl. 



1 Rothrock, Dr. J. T. List of, and Notes upon, the Lichens collected by Dr. 

 T. H. Bean in Alaska in 1880. Proc. U. S. Nat. Museum. 1884. 



