71. Ocellularia] 20. THELOTREMACEAE 131 



A. Spores more than 3-septate 



B. Spores large, more than 100 n in length 



C. Spores 1 in an ascus 2. O. domingensis 



C. Spores 8 in an ascus 3. O. floridensis 



B. Spores smaller, rarely more than 50 ^ in length 



C. Apothecia minute, not more than 0.3 mm. across .... 5. O. lathraea 

 C. Apothecia small, 0.3-0.8 mm. across 



D. Spores 5-7- or rarely 9-septate 4. O. granulosa 



D. Spores 7-15-septate 1. O. subtilis 



1. Ocellularia subtilis (Tuck.) Riddle, Mycologia 15:79. 1923. 



Thelotrema subtilis Tuck., Am. Journ. Sci. II. 25:426. 1858. 



Thallus thin to somewhat thick, rough, chinky, greenish gray to ashy white; 

 apothecia small to middle-sized, 0.4-0.8 mm. across, immersed to becoming super- 

 ficial, the disk concave to almost flat, black or whitish pruinose, the proper exciple 

 thin, surrounded by a thicker, raised, thalloid one; spores 8, fusiform, 7-15-septate, 

 26-54 X 6-13 p. 



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



2. Ocellularia domingensis (Fee) Mull. Arg., Flora 70:398. 1887. 



Ascidium domingense Fee; Nyl., Mem. Soc. Sci. Nat. Cherb. 5:118. 1857. 

 Thelotrema domingense (Fee) Tuck. Thelotrema domingense var. rhodo- 

 stroma (Mont.) Tuck. O. rhodostroma (Mont.) Zahlbr. 



Thallus thin, smooth to becoming rough and minutely granulose, sometimes 

 chinky, greenish gray to ashy or whitish; apothecia small, 0.4-0.8 mm. across, 

 immersed, the disk concave to flat, black or whitish pruinose, the proper exciple 

 thin, black, becoming irregular and elevated, surrounded by a thicker thalloid one; 

 spores 1, fusiform, 19-39-septate, 116-180 X 20-33 /a. 



On trees, from South Carolina to Florida, and westward to Louisiana and 

 Mississippi. 



3. Ocellularia floridensis Fink; Hedrick, Mycologia 25:314. 1933. 



Thallus thin to moderately thick, smooth to rough and chinky, ashy white; 

 apothecia small, 0.5-0.8 mm. across, immersed to superficial, the disk deeply con- 

 cave, black or whitish pruinose, the proper exciple thin, whitish, inflexed, sur- 

 rounded by a thicker, irregular, thalloid one; spores 8, oblong-cylindrical, slightly 

 flexuous, 15-29-septate, 118-180 X 16-20 /x. 



On trees, Florida. 



4. Ocellularia granulosa (Tuck.) Zahlbr., Cat. Lich. Univ. 2:591. 1924. 

 Thelotrema granulosum Tuck., Am. Journ. Sci. II. 25:426. 1858. 



Thallus thin, smooth to minutely granulose and warty, becoming chinky, green- 

 ish gray to ashy; apothecia small, 0.3-0.8 mm. across, immersed, the disk concave 

 to almost flat, black or grayish pruinose, the proper exciple very thin, black, 

 surrounded by a thin, elevated, thalloid one; spores 8, oblong-ellipsoid, 5-7- or 

 rarely 9-septate, 17-24 X 6-7.5 \x. 



On trees, Florida and Louisiana. 



5. Ocellularia lathraea (Tuck.) Zahlbr., Cat. Lich. Univ. 2:593. 1924. 



Thelotrema lathraeum Tuck., Syn. N. A. Lich. 1:224. 1882. 



Thallus thin, smooth to slightly rough, sometimes minutely warty, rarely be- 

 coming chinky, greenish gray to ashy or whitish; apothecia very minute, 0.08-0.12 

 mm. across, immersed, the disk concave, black or rarely grayish pruinose, the 

 proper exciple thin, blackening, elevated, surrounded by a thalloid one; spores 8, 

 oblong or oblong-ellipsoid, 5-7- or rarely 9-septate, 16-28 X 4-6.5 \x. 



On trees, Florida. 



6. Ocellularia micropora (Mont.) Mull. Arg., Flora 74:112. 1891. 



Thelotrema microporum Mont., Ann. Sci. Nat. Bot. III. 10:130. 1848. 

 Thallus thin, rough, chinky, greenish gray to ashy; apothecia minute to small, 

 0.1-0.3 mm. across, immersed, the disk deeply concave to almost flat, dark flesh- 



