OF ARTS AND SCIENCES. 397 



the more irregular laciniation, and the rather convex and strongly 

 toothed lobes, of P. granulifera ; which, in the state here referred 

 to, may be P. Domingensis, Ach. ; a distinct Lichen, according to Dr. 

 Ny lander (1. c.) from that so named by Montagne. 



Var. 8. (tribacia) Fr. : subadscendens, microphylla ; laciniis planis 

 margine eroso-granulosis in crustam dein granulosam conglobatis. Par- 

 melia stellaris, c, Fr. Lichenogr. p. 83 ; Tuckerm. Synops. Lich. N. E. 

 p. 34, & Lich. exs. n. 85. Lecanora tribacia, Ach. Syn. p. 191, pr. p. 

 On trees, very common, from New England to Virginia. South Caro- 

 lina, Mr. Ravenel. Louisiana, Dr. Hale. 



Var. c. HiSPiDA, Fr. : adscendens ; laciniis subabbreviatis hispido- 

 fibrillosis apice tubuloso-inflatis. Lichen hispidus, Auct. e Fr. Loharia, 

 HofFm. D. Fl. 2, p. 151. Parmelia stellaris, b. hispida, Fr. Lichenogr. 

 p. 82 ; Tuckerm. Synops. Lich. N. E. p. 34, & Lich. Exs. n. 84. Lichen 

 tenellus, Scop. Carn. p. 1406. Parmelia, dein Borrera, Ach. Syn. p. 

 221 ; Moug. & Nestl. Cr. Vog. n. 450. Physcia, DC. Fl. Fr. 2, p. 39G. 

 Parm. stellaris, v. tenella, Schosr. Spicil. p. 439, & Lich. Helv. n. 352, 

 562. Trees and rocks. Avciic America., Richardson (Hook, in Frankl. 

 Narr. App. p. 761). New England, not uncommon. Analogous to P. 

 speciosa, e. galactophylla {P. comosa, Eschw.). 



12. P. c^siA (Hoffm.), Nyl. Prodr. Gall. p. 62. Parmelia, Ach. 

 Lichenog. p. 479 ; Syn. p. 216 ; Fr. Lichenogr. p. 83. P. pulchella, 

 Schogr. Spicil. p. 437. 



Var. a. (stellata) Fr., Tuckerm. Lich. Amer. Exs. n. 86. On 

 stones and dead wood. Pennsylvania, Muhlenberg. New York, Halsey. 

 New England, not very uncommon. 



Var. /3. TRIBACIA, Fr. : subadscendens, microphylla ; laciniis convex- 

 iusculis margine demum eroso-granulosis conglobatis. Parmelia cmsia, 

 c, Fr. Lichenogr. p. 84. Lecanora tribacia, Ach. Syn. p. 191, pro p. 

 Parmelia, Sommerf. Lapp. p. 109. On rocks, New England; very 

 like P. stellaris, S, but differing in the convexity of its somewhat pin- 

 natifid, ash-colored lobules. 



Var. y. TENELLA, Fr. : adscendens ; laciniis hispido-fibrillosis. P. 

 ccBsia, b. tenella, Fr. Lichenogr. p. 84. Parmelia leptalea, Ach. Meth. 

 p. 198. Physcia, DC. Fl. Fr. 2, p. 395. Borrera tenella, iS. leptalea, 

 Ach. Lichenogr. p. 498 ; Syn. p. 221. On rocks and dead wood. New 

 England ? Differs but little from P. stellaris, e, but the same form has 

 indubitably been traced back (Fr. 1. c.) to both species. P. ccBsia is a 



