112 IS. GRAPHIDACEAE [54. Phaeographis 



clustered and sometimes radiately arranged, the disk open, concave to flat, black, 

 the exciple thin, colored like the disk, sometimes rudimentary and scarcely visible, 

 surrounded by a very thin, often obscure, thalloid one; hypothecium hyaline; 

 spores 8, oblong-ellipsoid, 3-septate, 15-18 X 6-7 /*. 

 On trees, Florida. 



2. Phaeographis subfulgurata (Nyl.) Zahlbr., Cat. Lich. Univ. 2:387. 1924. 



Graphis subfulgurata Nyl., Lich. Ins. Guin. 48, 49. 1889. 



Thallus thin, smooth, pale greenish gray to whitish; apothecia short and nar- 

 row, 0.5-1.5 X 0.15-0.25 mm., immersed, straight to curved or obscurely flexuous, 

 rarely branched, the disk covered entirely by the thallus or becoming narrowly 

 open and light-colored, the exciple thin, light or darker brown, covered laterally 

 by a thalloid one; hypothecium hyaline; spores 8, oblong, 3-septate, 17-22 X 

 6-8/*. 



On trees, Florida. 



3. Phaeographis dendriticella Mull. Arg., Engl. Bot. Jahrb. 5:139. 1884. 

 Thallus thin, smooth, whitish, somewhat shining; apothecia becoming moderate- 

 ly long and wide, 1-2.5 X 0.12-0.27 mm., immersed to partly immersed, variously 

 curved and flexuous, becoming much branched, often radiately, the disk soon open 

 and brownish black, the exciple thin and brownish black, surrounded laterally by 

 a thin, finally disappearing, thalloid one; hypothecium thin, brownish black; spores 

 8, oblong-ellipsoid, 3-septate, 15-20X4.5-7.5^. 



On trees, near Jacksonville, Florida. 



4. Phaeographis dendritica (Ach.) Mull. Arg., Flora 65:382. 1882. 

 Opegrapha dendritica Ach., Meth. Lich. 31. pi. 1, f. 10. 1803. P. dendritica var. 



medusula (Pers.) Hue. 



Thallus thin to somewhat thick, pale greenish gray to whitish, smooth to 

 slightly rough and wrinkled; apothecia becoming long and wide, 1-5 X 0.2-0.4 mm., 

 immersed to partly immersed, straight to commonly curved or flexuous, usually 

 branched, often much and radiately, the disk soon open and dull black, often 

 obscurely or plainly grayish pruinose, the exciple thin "and dull black, surrounded 

 laterally by a thin, disappearing, thalloid one; hypothecium thin, brownish black; 

 spores 8, oblong to oblong-ellipsoid, 3-5-septate, becoming brown, 15-30 X 5-9/*. 



On trees, from southern New England to Florida, and westward to Texas and 

 Nebraska. 



5. Phaeographis punctiformis (Eschw.) Mull. Arg., Flora 65:383. 1882. 

 Leiogramma punctijorme Eschw., in Mart., Fl. Bras. 1:101. 1833. 



Thallus moderately thick, smooth to slightly rough, pale greenish gray to 

 whitish, bordered more or less by a narrow black border; apothecia small, 0.3- 

 0.7 mm. across, immersed, rarely round to oblong or variously irregular and angu- 

 lar, the disk open, concave to flat, black, the exciple thin, brownish black; hypo- 

 thecium hyaline; spores 8, oblong-ellipsoid, 5-7-septate, 22-28 X 6-8 /*. 



On young trees, Louisiana. 



6. Phaeographis intricans (Nyl.) Vainio, Act. Soc. Faun. Flor. Fenn. 7 2 :116. 



1890. 



Graphis intricans Nyl., Ann. Sci. Nat. Bot. IV. 19:372. 1863. 



Thallus very thin, smooth, greenish gray to ashy, or white about the apothecia 

 or their branches; apothecia short and wide, 0.5-2X0.2-0.5/*, immersed, radi- 

 ately much-curved and flexuously branched, often clustered into confused groups, 

 the disk soon open, flat, grayish pruinose to finally black, the exciple thin and 

 brownish to brown, surrounded laterally by a very thin, disappearing, thalloid one; 

 hypothecium hyaline; spores 8, oblong-ellipsoid, 5-7-septate, 16-26X6-9/*. 



On trees, Florida. 



