THELOTREMACEAE. 



543 



2. Bilimbia aurata Riddle, sp. nov. 



Thallus crustaeeus uniformis effusus hand limitatus, e flavo intense aures- 

 cens, tenuis leprosus laxe eontextus. Gonidia cj*stococcoidea. Apotheeia minu- 

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

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

 vexo margine excluso; epitheeio lutescente, hymenio et hypotheeio incolore. 

 Asci clavati, 8-spori. Sporae incolores fusiformes apieibus rotundatis aut 

 altero apice subacuto, 4-loculares, loculis cylindricis aequalibus, 10-12 X 3^,. 



On bark, Parringdon Road, New Providence (Elisabeth G. Britton, August, 1904, 

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

 Suriana, Andros, at Barton Creek (Brace, 5297) ; on dead wood, Crooked Island, at 

 Gun Bluff (Brace, J I 693). Also, Palm Beach, Florida (R. Thaatter). 



The sterile specimens are similar to the Lepraria flaua 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 molybditis Tuck. Syn. N. A. Lich. 2: 34. 1888. 

 On bark, New Providence : Florida. 



4. BACIDIA DeNot. 



Apothecia pallid to flesh-color. 

 Apothecia reddish-brown to black. 



Apothecia persistently brown. 



Apothecia soon becoming black. 



1. B. medialis. 



2. B. f us co rubella. 



3. B. atroyrisea. 



1. Bacidia medialis (Tuck.) Riddle. 



Lecidea medialis Tuck, apud Nyl. Ann. Sci. Nat. IV: 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 fuscorubella Hoffm. Deutsch. Fl. 2: 175. 1795. 

 Biatora fuscorubella Tuck. Syn. N. A. Lien. 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. Fland. 1: 261. 1867. 



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

 America and Europe. 



THELOTREMACEAE. 



Family 8. 



1. Gyrostomum. 



2. Ocellularia. 



3. Thelotrema. 



4. Leptotrerna. 



1. GYROSTOMUM Fr. 



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

 Lecidea scyplmlifera Ach. Synops. Lich. 27. 1814. 



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

 spheres. 



Paraphyses branched and anastomosing. 

 Paraphyses simple and free. 



Spores pluriloeular, colorless. 

 Spores muriform-multilocular. 

 Spores colorless. 

 Spores brown. 



