544 THELOTEEMACEAE. 



2. OCELLULARIA Spreng. 



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



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



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 NichoU's Town : — Florida ; Cuba ; 

 Brarfl ; Tahiti ; Japan, 



2. Ocellularia subtilis (Tuck.) Eiddle. 



Thelotrema suhtile 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. lepaclinum. 



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



1. Thelotrema lepadinum Ach. Meth. Lieh. 132. 1803. 



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



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



2. Thelotrema paralbidum Riddle, sp. nov. 



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 convexis. 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 

 erenato aut sublaeerato 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 /a. 



On bark. Maidenhead Coppice, New Providence {Eliza'beth G. Britton, February, 

 1905, 3231,, type). 



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

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

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

 Roy. bot. Belg. 32i : 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 O.S-1.0 mm. diameter ; spores 20-30/x in length. 2. L.tahianum. 

 Verrucae 0.3— 0.5 mm. diameter ; spores 35— 50^t in length. 3. L. simplex. 

 Apothecia sunken in the thallus. 



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



Spores 8 in each ascus. 



Spores with 4-6 series of cells. 



Spores 10-14 x6-8w 5. L. glauceseens. 



Spores 17-27 X 10-18tt. 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. 



