THELOTREMACEAE. 543 



2. Bilimbia aurata Eiddle, sp. nov. 



Thallus crustaceus uniformis effusus baud limitatus, e flavo intense aures- 

 cens, tenuis leprosiis laxe contextus. Gonidia cystococeoidea. Apothecia minu- 

 tissima, 0.1-0.15 mm. lata, sat elevata rotundata regularia ceracea^ diseo 

 aurantiaco, primimi piano margine tenuissime pallidiore subleproso, mox con- 

 vexo margine excluso; epithecio lutescente, hymenio et hypothecio incolore. 

 Asei clavati, 8-spori. Sporae ineolores fusiformes apicibus rotundatis aut 

 altero apice subacuto, 4-loculares, lociilis cylindricis aequalibus, 10-12 X 3/*. 



On bark, Farringdon Road, New Providence (Elizabeth O. Britton, August, 1904. 

 221, type). The following sterile specimens appear to belong here also: — on dead 

 8uriana, Andros, at Barton Creek (Brace, 5297) ; on dead wood. Crooked Island, at 

 Gun Bluff (Brace, ^693). Also, Palm Beach, Florida (R. Thaxter). 



The sterile specimens are similar to the Lepraria ^ava of the older authors, 

 although brighter and more golden. But the fertile specimen has abundant apothecia, 

 which certainly belong to the thallus in question. The species is a very distinct one. 



3. Bilimbia molybditis (Tuck.) Riddle. 



Biatora molyhditis Tuck. Syn. N. A. Lich. 2: 34. 1888. 

 On bark, New Providence : — Florida. 



4. BACIDIA DeNot. 



Apothecia pallid to flesh-color. 1. B. medialis. 

 Apothecia reddish-brown to black. 



Apothecia persistently brown. 2. B. fuscorubella. 



Apothecia soon becoming black. 3. B. atrogrisea. 



1. Bacidia medialis (Tuck.) Riddle. 



Lecidea medialis Tuck, apud Nyl. Ann. Sci. Nat. lA^: 19: 346. 1863. 



Biatora medialis Tuck. Syn. N. A. Lich. 2: 132. 1888. 



On bark, New Providence : — Florida ; Texas ; Cuba ; Nicaragua ; Brazil. 



2. Bacidia fuscorubella (Hoffm.) Arnold, Flora 54: 55. 1871. 



Verrucaria fuscoruljella Hoffm. Deutsch. Fl. 2: 175. 1795. 



Biatora fuscoriihella Tuck. Syn. N. A. Lich. 2: 43. 1888. 



On bark. New Providence : — widely distributed in the northern hemisphere. 



3. Bacidia atrogrisea (Delise) Arnold, Flora 41: 505. 1858. 



Biatora atrogrisea Delise apud Hepp, Fl. Eur. 26. 1853. 

 Lecidea luteola f. endoleuca Nyl. Bot. Notis. (1853) 98. 

 Bacidia endoleuca Kickx, Fl. Crypt. Eland. 1: 261. 1867. 



On bark. New Providence, at Maidenhead Coppice : — widely distributed in North 

 America and Europe. 



Family 8. THELOTREMACEAE. 



Paraphyses branched and anastomosing. 1. Gvrosiomum. 



Paraphyses simple and free. « ^ „ , . 



Spores plurilocular, colorless. 2. Ocellulana. 



Spores muriform-multilocular. o r^x. , ^ 



Spores colorless. 3. Thelotrema. 



Spores brown. 4. Leptotrema. 



1. GYROSTOMUM Fr. 

 1. Gyrostomum scyphuliferum (Ach.) Fr. Syst. Orb. Yeg. 268. 1825. 

 Lecidea scyplndifera Ach. Synops. Lich. 27. 1814. 



On bark, New Providence : — widely distributed in tropical regions of both hemi- 

 spheres. 



