STICTA. 93 



3. S. erosa (Eschw.) ; thallus generally like that of S. am- 

 plissima, but smaller and more membranaceous, scrobiculate ; 

 glaucescent (fuscescent;) beneath villous and becoming black- 

 ish-brown; the lobes now more entire or erose-crenate, and 

 now passing, as in the other species named into narrowed and 

 looser, more or less strongly sinuate divisions j apothecia scat- 

 tered, middling to ample, membranaceous ; the disk chestnut j 

 the inflexed margin at length lobulate-crenate. Spores slender- 



acicular, 2-4-locular, soon without colour, 4 J mic. Parme- 



lia, Eschw. Bras. p. 211. Sticta Ravenelii, Tuckerm. Suppl. 2, 

 I. c. p. 203. Ricasolia crenulata v. stenospora, Nyl. Syn. 1, p. 

 373, dein E. erosa, Nyl. in Prodr. Fl. N. Gran. p. 21. 



Trunks and rocks, in the low country of South Carolina and 

 Georgia (Ravenel), Tuckerman 1. c. 1859, Florida, Austin, and 

 throughout the Gulf States, Peters, Hale, etc. Also in the 

 Island of Cuba (Lich. Cub. n. 66), and elsewhere within the 

 tropics. Differing in its (at length deeply and reticulately) pit- 

 ted upper side, and its crenulate-lobate apothecia, in which last 

 feature it resembles at length S. crenulata (Hook.) Del., and S. 

 pallida (Hook.). 



4. 8. dissecta, Ach.; thallus ample, orbicular, coriaceous, 

 lacero-laciniate, more or less lacunose; cinerous-glaucescent ; 

 beneath villous in blackish anastomosing veins between naked, 

 pale spots ; the elongated lobes more or less deeply or even pin- 

 nately sinuate, with rounded and crenate circumference ; apo- 

 thecia middling to ample, scattered ; disk chestnut, bordered 

 by a sub-entire or finally lobulate margin. Spores broad-fusi- 

 form, 2-4-locular, fuscescent, ^ mic. Ach. L. U. p. 451. S. 



peltigera, Del. Stict. p. 150. Ricasolia dissecta, Nyl. Syn. 1, p. 

 370, & E. sub-dissecta, Nyl. ibid. p. 371. 



b. corrosa, Ach. ; lobes passing, more or less, at the margins, 



into a fringe of slender lobules. Ach. Syn. p. 235. S. dissecta, 



Del. Stict. p. 148. Ricasolia corrosa, Nyl. Syn. 1, p. 372. 



Trunks, Mexico, Nylander I. c. 1860. 



Well distinguished by its veiny under side, and brown spores. 

 It is admirably exhibited in Lindig's New Granada collection ; 

 for I cannot consider the Nos. 713, 2543 of the first, and 66 and 

 79 of the second series of this collection (Ricasolia sub-dissecta, 

 Nyl.) as at all well separable in species from No. 113 (R. dissecta, 

 Nyl.). 



