544 THELOTEEMACEAE. 



2. OCELLULARIA Spreng. 



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



Spores eight- to sixteen-eelled. 2. 0. eubtilla. 



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



1891. 



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



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

 Brazil ; Tahiti ; Japan. 



2. Ocellularia siibtilis (Tuck.) Kiddle. 



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

 Thelotrema bicinctulum Nyl. Ann. Sci. Xat. 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 Ach. Meth. Lich. 132. 1803. 



Lichen lepadinus Ach. Lich. Suec. Prodr. 30. 1798. 



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



2. Thelotrema paralbidum Eiddle, sp. now 



Thallus epiphloeodes crustaceus uniformis effusus haud limitatus, sordide 

 albidus, in crassitudine mediocris, rimoso-areolatus areolis subquadrangularibus 

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

 Apothecia approximata aut partim dispersa, areolis thallinis immersa haud 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 cubicis 2-3-locellatis, 22-25 X 9-11 /x. 



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

 1905, 323J,, type). 



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

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

 characters. It is, perhaps, most closelv 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 20-3O w in length. 2. L.bahianum. 

 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 10-14 x 6-8 5. L. glaacescens. 



Spores 17-27 x 10-18 . 6. L. Wightii. 



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



1. Leptotrema monosporum (Nyl.) Muell. Arg. Bull. Soc. Roy. 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. 



