62 



5. TRYPETHELIACEAE [27. Trypethelium 



2 Trypethelium mastoideum Ach., Lich. Univ. 307. pi. 4, f. 9. 1810. 



Bathelium mastoideum Ach., Meth. Lich. 111. pi. 8, f. 3. 1803. T. scoria Nyl. 

 T. carolinianum Tuck. 



Thallus very thin to thin, smooth, greenish gray to yellowish or ashy, bordered 

 by a black hypothallus, the superficial portion sometimes disappearing and the im- 

 bedded portion indicated at the surface as a yellowish or ashy coloration; perithecia 

 minute, 0.05-0. IS mm. across, heaped together in irregular, convex, blackish brown 

 stromata, or rarely solitary in stromatic elevations, the superficial portion black, 

 the ostiole minute, black; spores oblong-ellipsoid, 3-septate, 18-24 X 6.5-9/*. 



On trees, from New Jersey to Florida and in Alabama and Texas. 



3. Trypethelium tropicum (Ach.) Mull. Arg.; Engler, Bot. Jahr. 6:393. 1885. 



Verrucaria tropica Ach., Lich. Univ. 278. 1810. Pyrenula tropica (Ach.) Trev. 



Thallus very thin to thin, smooth to rough, greenish gray to yellowish; perithecia 

 minute to small, 0.08-0.3 mm. across, heaped together in irregular, brownish black 

 stromata, or solitary in globose, clustered, stromatic elevations, the superficial 

 portion depressed, black or whitish pruinose, the ostiole small, black ; spores oblong, 

 3-septate, 18-24 X 6-8/*. 



On trees, South Carolina, Florida, Alabama, Texas, and Mississippi. 



4. Trypethelium virens Tuck., in Darl., Fl. Cestr. ed. 3. 453. 1853. 



Thallus very thin to thin, smooth, greenish yellow to brownish; perithecia 

 minute, 0.05-0.15 mm. across, several to many immersed in slightly convex, round 

 or irregular, scattered or clustered, greenish yellow or brownish stromata, the ostiole 

 minute, black; spores oblong-ellipsoid, 3-9-septate, 30-50 X 10-15/*. 



On trees, from New England to Florida and westward to Louisiana and Ohio. 



5. Trypethelium catervarium (Fee) Tuck., Gen. Lich. 260. 1872. 



Verrucaria catervaria Fee, Essai Crypt. 90. pi. 22, f. 1. 1824. 



Thallus very thin, rudimentary, smooth to rough, ashy gray to yellowish, the 

 superficial portion sometimes disappearing, and the imbedded portion indicated at 

 the surface as a yellowish gray coloration; perithecia minute, 0.08-0.15 mm. across, 

 immersed 1-several in ashy, irregular stromata, the ostiole minute, black; spores 

 ellipsoid, 3-septate, 14-22 X 6-8.5 /*. 



On trees, Florida and Alabama. 



6. Trypethelium scorites Tuck.; Nyl., Ann. Sci. Nat. Bot. IV. 20:259. 1863. 

 Thallus very thin, smooth, the superficial portion sometimes absent, and the 



imbedded portion indicated at the surface by an ashy or brownish gray coloration; 

 perithecia minute, 0.05-0.15 mm. across, heaped together in very irregular, convex, 

 blackish brown stromata, or rarely solitary in stromatic elevations, the ostiole 

 minute, black, scarcely visible; spores oblong to oblong-ellipsoid, 5-7-septate, 

 42-52 X 12-17/*. 



On trees, North Carolina, Florida, Alabama, and Mississippi. 



7. Trypethelium exocanthum Tuck.; Nyl., Ann. Sci. Nat. Bot. IV. 20:258. 1863. 



Thallus very thin, rudimentary, smooth, the superficial portion usually absent, 

 and the imbedded portion indicated at the surface by a greenish brown coloration; 

 perithecia minute, 0.05-0.2 mm. across, 1-several immersed in subglobose, irregular 

 stromata, the ostiole rarely visible; spores oblong-ellipsoid, 5-9-septate, 40-46 X 



9-12 /*. 



On trees, North Carolina, South Carolina, Florida, Alabama, Louisiana, Ten- 

 nessee, and West Virginia. 



8. Trypethelium pallescens Fee, Ann. Sci. Nat. 23:440. pi. 8, f. la-c. 1831. 



Trypethelium ochroleucum var. pallescens (Fee) Mull. Arg. 



Thallus very thin, smooth, yellowish gray or ashy; perithecia minute, 0.05-0.25 

 mm. across, heaped together in irregular, ashy or yellowish stromata, the ostiole 

 minute, black; spores ellipsoid, 3-septate, 20-28 X 8-9.5 /*. 



On trees, Louisiana, Florida, and Texas. 



