OF ARTS AND SCIENCES. 389 



Borrera angustata, Bory in Herb. Berol. B. Boryi, Willd. in Fee, Ess. 

 p. 96, tab. 2, fig. 23, e Fr. Lichenogr. p. 76. Physcia soknaria, Dub. 

 Bot. Gall. II. p. 612, non Borr. solenaria, Ach. P. ciliaris, v. solenaria, 

 Auctt. On the earth and upon rocks. Arctic America {B. ciliaris), 

 Eichardson (Frankl. Narr. p. 761). Newfoundland, Bory in Herb. 

 Berol. Rocky Mountains, fertile. Herb. Hook. Shores of Lake Su- 

 perior, fertile, Mr. C. G. Loring, jun. Shores of Willoughby Lake, 

 Vermont, Mr. Frost. Does not appear to differ from a Corsican speci- 

 men of P. so/encma, Dub., from Von Krempelhliber, which is infer- 

 tile, but with yellowish " cephalodia " ; but the cited name, which was 

 given to a different Lichen by Acharius, is hardly to be preferred to 

 that of Bory. Apothecia similar to those of the species, but smaller ; 

 the disk black, with a white bloom ; the erect margin torn, or at length 

 radiate-fimbriate ; spores (of the species) large, olivaceous-fuscous, ob- 

 liquely ellipsoid, once-septate, about thrice longer than wide. The 

 Lichen is among our rarest. 



7. P. AQUiLA (Ach.), NyL var. detonsa: e glauco fuscescens; laciniis 

 elongatis subplanis margine coralloideo-subfimbriatis. Parmelia detonsa, 

 Fr. Ph Homon. p. 284 ; Tuckerm. Synops. Lich. N. E. p. 32, & Lich. 

 Exs. n. 18. Trees and rocks. Pennsylvania (P. aquila), Muhl. Catal. 

 New England to Virginia, common in woods. Ohio, Mr. Lea. North 

 Carolina, Rev. Dr. Curtis. South Carolina and Georgia, Mr. Ravenel. 

 Alabama, 3Ir. Beaumont. Mississippi, Dr. Veitch. Louisiana, Dr. Hale. 

 Much as extreme forms of our Lichen differ from common European 

 states of the species, it is difficult to separate it, even as a variety. I 

 find no difference in the spores. Mr. Wright collected the same plant 

 in Japan. (U. S. N. Pacif. Expl. Exp.) The species appears to be in 

 intimate relations with P. ciliaris, and is also near to narrow states of 

 the next species, with which Dr. Nylander (Prodr. Gall. p. 63) com- 

 pares the American Lichen. 



8. P. PULVERULENTA (Schreb.),Nyl. Parmelia {Physcia) pulveru- 

 lenta, Fr. Lichenogr. p. 79, a, thalli laciniis appressis margine nudis, 

 Fr. 1. c. P. pidveridenta, a, Tuckerm. Synops. p. 32. Parm. pidveru- 

 lenta, venusta, & muscigena, Ach. On trunks and rocks, and on the 

 earth, upon mosses. Pennsylvania, Bluhlenherg. Arctic America {P. 

 muscigena), Richardson. New England, common on trunks of Elm, 

 and other trees. New York, passing into narrow states reserabhng the 

 last, Dr. Sartwell. Nebraska, on the earth, a fragment. Dr. Hayden. 



