CETRARIA. 37 



ate ; apothecia marginal, middling-sized to ample; disk chestnut: 



59 



margin entire or irregular. Spores rounded-ellipsoid, r rnic. 

 Tuckerm. Syn. N. Eng. p. 17; Exs. n. 7. Platysmd, Nyl. 



1, p. 304. ^Cetraria Bavarica, Krempelh. in Flora, 1851, 

 p. 273. 



Trees and rocks ; New England, and New York, and south- 

 ward to Maryland, fertile only in mountain forests ; Tucker man 

 Lich. N. E. 1841. Lake Superior, Agassis. Black Mountains, 



South Carolina, fertile, M. A. Curtis. 1 have failed to find 



spermatia, either in this or the species next following ; but the 

 two are associable (better perhaps than C. Oakesiana with C. 

 Laureri) and C. aurescens certainly suggests C. juniperina. 



21. C. aurescens, Tuckerm. ; thallus sub-membranaceous, 

 foliaceous, sinuate-laciniate ; straw-coloured ; beneath whitish, 

 with frequent fibrils of the same colour ; lobes narrowed, many- 

 cleft above, the ascendant margins crisped ; apothecia marginal, 

 middling-sized to ample, at length rather elevated ; disk chest- 

 nut j margin creuulate. Spores rounded, and sub -ellipsoid, 



^ mic. Tuckerm. Syn. N. Eng. p. 16. Platysma, Nyl. 



Syn. I, p. 313. 



Coniferous trees ; and (infertile) on old rails, New England ; 

 Tuckerman Syn. 1848. New Jersey, Austin. Alabama, T. M. 

 Peters. 



22. C. juniperina (L.) Ach. ; thallus membranaceous, folia- 

 ceous, lacero-laciniate; from greenish -glaucescent at length 

 straw-coloured above and pale-yellow below, or finally bright- 

 yellow on both sides ; the crowded, more or less lacunose, erose- 

 crenate and crisped lobes ascendant ; apothecia sub-marginal, 

 middling-sized to ample, at length rather elevated : disk chest- 



4MJ 



nut ; margin crenulate. Spores ellipsoid, ~ mic. Spermatia as 



in C. chrysantha. Ach. L. U. p. 506. Tuck. Exs. 8. Th. Fr. 



Lich. Scand.p. 104. Platysma, Nyl. Syn. I, p. 312. 



b. terrestris, Schger. ; lobes narrowed and sub-linear with 

 scarcely crisped edges, finally erectish, angulous-teretish, and 



dichotomously branched ; sterile. Schcer. Spicil. p. 10 (1823). 



Varr. terrestris & tubulosa, Sch&r. Enum. C. Tilesii, Ach. Syn. 



p. 228. 



c. Pinastri, Ach. ; lobes depressed, flat, the ascendant mar- 

 gins bright-yellow-sorediate ; scarcely fertile. Ach. L. U. 



p. 506. 



