544 THELOTEEMACEAE. 



2. OCELLULARJA Spreng. 



Spores four- to six-celled. 1. O. micropora. 



Spores eight- to sixteen-celled. 2. O. subtilis. 



1. Ocellularia micropora (Mont.) Muell. Arg. Nuov. Giorn. Bot. Ital. 23: 129. 



1891. 



Thelotrema microporum Mont. Ann. Sci. Nat. Ill: 10: 130. 1848. 



On bark, Andros, at Louisa Coppice near Nicholl's Town : Florida ; Cuba ; 

 Brazil ; Tahiti ; Japan. 



2. Ocellularia subtilis (Tuck.) Biddle. 



Thelotrema subtile Tuck. Am. Journ. Sci. 25: 426. 1858. 

 Thelotrema bicinctulum Nyl. Ann. Sci. Nat. IV: 15: 46. 1861. 



On bark, New Providence : widely distributed. 



3. THELOTREMA Ach. 



Apothecia in raised, convex verrucae. 1. T. lepadinum. 



Apothecia sunken in the thallus. 2. . T. paralbidum. 



1. Thelotrema lepadinum Aeh. Meth. Lich. 132. 1803. 



Lichen lepadinus Aeh. Lich. Suee. Prodr. 30. 1798. 



On dead wood, New Providence, near Soldiers' Home : cosmopolitan. 



2. Thelotrema paralbidum Eiddle, sp. nov. 



Thallus epiphloeodes crustaeeus unifonnis effusus baud limitatus, sordide 

 albidus, in crassitudine mediocris, rimoso-areolatus areolis subquadrangularibus 

 0.6-1.0 mm. latis inaequalibus vel leviter convexis. Gonidia chroolepoidea. 

 Apothecia approximata aut partim dispersa, areolis thallinis immersa baud ver- 

 rucas formantia, suborbicularia 0.5-0.8 mm. lata, disco aperto piano albissimo 

 farinoso, superficiem thalli subaequante aut paullum submerso, margine duplice 

 crenato aut sublacerato parum prominente; intus hyalino. Paraphyses sim- 

 plices. Asci clavati, 8-spori. Sporae incolores ovideae murali-divisae, 8-10- 

 loculares, loculis eubicis 2-3-locellatis, 22-25 X 9-1 1/u. 



On bark, Maidenhead Coppice, New Providence (Elisabeth G. Britton, February, 

 1905, 3231,, type). 



Thelotrema paralbidum is externally similar to Ocellularia albida (Nyl.) Riddle, 

 (Thelotrema albidum Nyl. Act. Soc. Sei. Fenn. 7: 451. 1863). but differs in spore- 

 characters. It is, perhaps, most closely related to T. velatum Muell. Arg. (Bull. Soc. 

 Roy. bot. Belg. 32 1 : 26. 1894), but differs in the thicker, areolate thallus, the white 

 disk, and the shorter spores. 



4. LEPTOTREMA Mont. & v. d. Bosch. 



Apothecia in convex verrucae. 



Spores 1-2 in each ascus. 1. L. monosporum, 



Spores 8 in each ascus. 



Verrucae 0.8-1.0 mm. diameter ; spores 20-30 M in length. 2. L.bahifnnim. 

 Verrucae 0.3 0.5 mm. diameter ; spores 35-50 # in length. 3. L. simplex. 

 Apothecia sunken in the thallus. 



Spores 1-4 in each ascus. 4. L. bisporum. 



Spores 8 in each ascus. 



Spores with 4-6 series of cells. 



Spores 1 0-1 4 x 6-8 w 5. L. glauccscens. 



Spores 17-27 x!0-18. 6. L. Wightii. 



Spores with 610 series of cells. 7. L. compunction. 



1. Leptotrema monosporum (Nyl.) Muell. Arg. Bull. Soc. Eoy. Bot. Belg. 31 2 : 

 35. 1892. 



Thelotrema monosporum Nyl. Ann. Sci. Nat. IV: 15: 46. 1861. 

 On bark, New Providence : widely distributed in the warmer regions. 



