OF ARTS AND SCIENCES. 393 



Carolina, Rev. Dr. Curtis. South Carolina, Mr. Ravenel. Alabama, 

 Mr. Peters. Mississippi, Dr. Veitch. Louisiana, Dr. Hale. Texas, 

 Mr. WrigJit. At first sub-stellate, and scarcely dilated, when the fer- 

 tile specimens only differ from the last variety so far as the apothecia 

 are less strikingly pedicellate ; and the infertile ones from substellate 

 less canaliculate specimens of the next, in nothing but the elongation 

 which is so characteristic a tendency in the latter : — but the short, 

 dilated, erectish lobes of the fully developed and fertile Lichen, and its 

 peculiarly conspicuous, milk-white under-side (which furnishes a more 

 constant distinction than that indicated by the name adopted by Esch- 

 weiler), are sufficiently striking. Cuban specimens of the present vari- 

 ety are often more or less suffused, especially at the tips of the lobes, 

 and the margins of the apothecia, with a (sometimes intense) brick-red 

 color ; this occurs equally in the preceding variety, and according to 

 Montague and Van den Bosch (Lich. Jav. p. 22), who consider it ad- 

 ventitious, was regarded as characteristic of his P. podocarpa by Be- 

 langer. I observe the same in Cuban specimens of the typical form. 



Var. C' LEUC03IELA, Eschw. : adscendens, glabra, e substellata mox 

 diffusa, eiongata ; laciniis attenuatis ciliato-fibrillosis subtus pulverulento- 

 tomentosis ; apotheciis subpodicellatis pruinosis niargine demum radiato- 

 lobatis. Sporaj speciei. Lichen leiicomelas, L., Sw. Obs. Bot. tab. 11, 

 f. 3. Physcia, Michx. Fl. Bor. Am. 2, p. 326; Dub. Bot. Gall. 2, 

 p. 612 ; Nyl. Enum. Gen. 1. c. p. 106. Parmelia, Ach. Meth. p. 256 ; 

 Fr. Lichenogr. p. 76 ; Montag. Crypt. Canar. 1. c. p. 111. Borrera, 

 Ach. Lichenogr. p. 499 ; & Syn. p. 222. Parmelia speciosa, b. Fr. 

 Lichenogr. p. 80 ; Moug. & Nestl. Crypt. Vog. n. 941. P. speciosa, 

 var. leucomelas, Eschw. Bras. 1. c. p. 198. Lichen comosvs, Bory, Voy. 

 cit. Ach, On trees, and probably also, as in Cuba, on rocks. Trees, 

 Grandfather Mountain, North Carolina, the specimen belonging to the 

 wider states, Michaux. On Red Cedars, infertile, Ohio, Mr. Lea. On 

 trees in the mountains of Virginia, Rev. Dr. Curtis ; and of Carolina, 

 Mr. Ravenel. Florida, Herb. Russell. Texas, i>r. Parry. The Ohio 

 specimens were found growing with those of the last variety, which 

 looks like the fertile state of the same lichen ; nor is it possible to 

 distinguish narrow-lobed specimens of that from others of the present 

 variety except by the difference of size, and especially of elongation. 

 Excluding from this the short, wide-lobed South American forms (P. 

 leuco7nela, var. latifolia, Mey. & Flot. pr. p.), which, as already re- 



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