Vol. I] STEUART— LICHENS OF GALAPAGOS ISLANDS 441 



Usnea Dill. 



U. arthrocladon Fee — Narborough Isl. : southern part, 

 Snodgrass and Heller. Not obtained by the Academy's ex- 

 pedition. 



U. ceratina Ach. — Abingdon Isl. : on the branches of trees 

 600-1000 ft. (No. 402). Duncan Isl.: on bushes at about 

 1200 ft. (No. 403). Indefatigable Isl.: northwest side, on 

 the branches of bushes and trees above 600 ft. (No. 404). 

 James Isl. : James Bay, occasional on the branches of trees at 

 2000 ft. (No. 405). Narborough Isl. : Snodgrass and Heller. 



U. dasypoga (Ach.) Nyl. var. plicata (Hoffm.) Hue. — 

 Charles Isl. : Andersson. James Isl. : Darwin. Has not 

 since been obtained by the later expeditions to these islands. 



U. longissima Ach. — Abingdon Isl. : common on the 

 branches of trees at 1000 ft. (No. 406). Albemarle Isl.: 

 Cowly Bay, common on branches of Bursera graveolens above 

 1800 ft. The branches are often covered with long festoons 

 of this lichen making quite a striking effect, (No. 407). 

 Tagus Cove, common on bushes at 3000 ft. (No. 408). 



Verrucaria Scop. 



V. ocraceo-flava Nyl. — Barrington Isl. : common on the 

 branches of dead bushes, (No. 411). Charles Isl.: encrust- 

 ing dead branches at about 600 ft. (No. 409). Hood Isl.: 

 common on dead branches, (No. 412). Tower Isl. : common 

 on the branches of Bursera graveolens, (No. 410). 



