<'>44 THELOTEEMACEAE. 



2. OCELLULABIA Spreng. 



Spores four- to six-celled. 1. 0. micropora. 



Spores eight- to sixteen-celled. 2. 0. suttilis. 



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



1891. 



Tlielotrema microporum Mont. Ann. Sei. Nat. Ill: 10: 130. 1848. 



On bark, Andros, at Louisa Coppice near Kiclioirs Town : — Florida ; Cuba ; 

 Brazil ; Tahiti ; Japan. 



2. Ocellularia subtUis (Tuck.) Eiddle. 



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

 Thelotrema hicinctulum 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. Licli. 132. 1803. 



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



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



2. Thelotrema paralbidum Eiddle, sp. nov. 



Thallus epiphloeodes crustaeeus uniformis effusus hand limitatus, sordide 

 albidus, in erassitudine mediocris, rimoso-areolatus areolis subquadrangularibus 

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

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

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

 farinose, superficiem thalli subaequante aut pauUum submerso, margine duplice 

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

 pliees. Asci clavati, S^spori. Sporae incolores ovideae murali-divisae, 8-10- 

 loculares, loculis cubicis 2-3-locellatis, 22-35 X 9-11,". 



On bark. Maidenhead Coppice, New Providence (EUzateth O. Britton, February, 

 1905, 323Ji, type). 



Thelotrema paralbidum is externally similar to OcelliUaria albida (Nyl.) Eiddle, 

 {Thelotrema alhidum Nyl. Act. Soc. Sci. Fenn. 7: 451. 1863), but flitters in spore- 

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

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

 disk, and the shorter spores. 



4. LEPTOTBEMA 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^ in length. 2. L. bahianuvi. 

 Verrucae 0.3-0.5 mm. difimeter ; spores 35-50 « in length. 3. L. simplex. 

 Apothecia sunken in the thallus. 



Spores 1—4 in each ascus. 4. L. Msporum. 



Spores 8 in each ascus. 



Spores with 4-6 series of cells. 



Spores 10— 14x6-8 « 6. L. glaucescens. 



Spores 17-27 X 10-18«. 6. L.Wightii. 



Spores with 6—10 series of cells. 7. L. compunctum. 



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

 35. 1892. 



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



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



