OF ARTS AND SCIENCES: SEPTEMBER 11, 1866. 223 



Lichenes.* (By Edw. Tuckerman.) 



Trib. I. Parmeliacei, Fr. 



Fam. 1. Usneei. 



Siphula Pickeringii, Tuckerm. (Bot. U. S. S. Pacif. Expl. Exp.) 

 Appears scarcely referable to S. torulosa (Thunb.) to which Nylander 

 (Lich. exot.) has referred it; but possibly to S. pteruloides, Nyl. 1. c, 

 a Peruvian Lichen. — On the earth, among mosses, Oahu (Pickering), 

 Tuck. 1. c. 



Ramalina Manni (sp. now) : thallo subfoliaceo depresso lacero- 

 laciniato glauco, subtus nigricante, laciniis lacunosis margine eroso-den- 

 ticulatis, fertilibus suberectis ; apotheciis podicellatis margine evanido. 

 Sporse octonre in thecis, parvse, diblastas, curvuke, diam. 2 - 2| plo lon- 

 giores, incolores. — Trunks, Makawao, East Maui (Mann). — Exhibits 

 a close approach to the foliaceous thallus of Cetraria ; and the de- 

 pressed habit and differently-colored sides are new to the present 

 genus, with which it is none the less associated by the characters of 

 fructification. The rather short, lacunose, and, especially when fertile, 

 ascendant lobes are about one quarter of an inch in diameter ; the apo- 

 thecia reach the same size. Spores .013 - .014 mm long. 



Ramalina laevigata, Fr. — Trunks, Mountains of Kauai (Mann). 



Ramalina calicarts (L.) Fr., var. fraxinea, Fr. — Trunks, Oahu 

 (Mann). Var. farinacea, Schaer. ? JR. complanata, Ach. ? — 

 Hawaii (Pickering), Tuck. 1. c. Var. inflata. R. inflata, Hook. 

 — Trees, Kaala Mountains, Oahu (Mann). 



Usnea barbata (L.) Fr., var. Florida. Fr. — Trunks, Hawaiian 

 Islands, Nyl., Tuck. ; as also in the form jviicrocarpa (Pers., e Gau- 



* The list is meant to include all that is known of the Lichen-Flora of the 

 Islands. This makes part only of a larger Flora, the limits of which arc scarcely 

 settled ; and is not to be understood without constant reference to what has been 

 determined of the latter. Montagne and Jardin have illustrated portions of the 

 wider field ; and Dr. Nylander has combined their results with important ones of 

 his own, in his Lichenes Polynesienses, which makes the second part of his Lichenes 

 exotici (Ann. Sci. Nat. 4, 11). Besides this enumeration, reference is made in 

 what follows to the list of Lichens (prepared by the present writer) in the Botany 

 of the U. S. S. Pacif. Expl. Exp. It is scarcely to be doubted that other Lichens, 

 cited as Polynesian, have been determined by European Lichenists in specimens 

 from the Sandwich Islands, and among these some of those here credited to Mr. 

 Mann may well occur : but the catalogue will still show how large a proportion of 

 our knowledge, especially in the crustaceous groups, is due entirely to his re- 

 searches ; — directed, as these were, by previous study of North American Lichens. 



