^>42 LECIDEACEAE. 



Family 7. LECIDEACEAE. 



Spores simple. 1. Lecidea. 



Spores four- to many-celled. 



Spores thick-walled, with more or less lens-shaped cells. 2. Bomhyliospora. 

 Spores thin-walled, with cylindrical cells. 



Spores four-celled, fusiform. 3. Bilimhia. 



Spores many-celled, acicular. 4. Bacidia. 



1. LECIDEA Ach. 



Growing on rocks. 1. L. immersa. 

 Growing on bark. 



Hypothecium pale. 2. L. vernalis v. minor. 



Hypothecium blackish-brown. 3. L. fiirfurosa. 



t 



1. Lecidea immersa (Web.) Ach. Meth. Licli. 34. 1803. 



Lichen immersus Web. Spicil. Fl. Goett. 188. 1778. 

 Lecidea calcivora Mass. Eic. Lieh. Crost. 78. 1852. 

 Biatora calcivora Tuck. Syn. X. A. Lich. 2: 29. 1888. 



On calcareous rocks. New Providence, along Soldier's Road : — southern United 

 States ; Europe. 



2. Lecidea vernalis (L.) Ach. var. minor Xyl. apud Xorrl. in Not. Saellsk. 



Faun. Fl. Fenn. 13: 335. 1873. 



On bark. New Providence : — North America ; Europe. 



3. Lecidea furfurosa Tuck, apud Xyl. Ann. Sci. Nat. IV: 19: 341. 1863. 



Biatora furfurosa Tuck. Syn. X. A. Lich. 2: 19. 1888. 

 On bark. New Providence, at Grantstown : — ^Florida ; Cuba. 



2. BOMBYLIOSPORA DeXot. 



1. Bombyliospora domingensis (Pers.) Zahlbr. apud Wawra and Beck; Jtinera 

 Princip. Coburg. 2: 154. 1888. 



Patellaria domingensis Pers. Annal. Wetter. 2: 12. 1810. 

 Heterothecium domingense Flot., Tuck. Syn. X. A. Lich. 2: 57. 1888. 



On bark. New Providence, coppice near Clifton : — widely distributed in tropical 

 regions of both hemispheres. 



3. BILIMBIA DeXot. 



Growing on rocks : apothecia blackening. 1. B. trachona. 

 Growing on bark or old wood. 



Thallus and apothecia golden-yellow. 2. B. aurata. 



Thallus gray or greenish ; apothecia pallid. 3. B. molybditis. 



1. Bilimbia trachdna (Ach.) Th. Fr. Lieh. Scand. 386. 1871. 



Verrucaria trachona Ach. Meth. Lich. Suppl. 16. 1803. 

 Lecidea phaeomela Xyl. Ann. Sci. Xat. IV: 19: 34. 1863. 



On limestone, New Providence : — locally distributed in North America and 

 Europe. 



The original description of this species says, " crusta pulverulenta." Mr, L. J. 

 K. Brace has sent in a series of collections from New Providence showing that the 

 thallus varies from areolate-rimose, in well-developed specimens, to a dispersed and 

 granulate condition, and in some cases disappearing. The name Lecidea phaeomela 

 was applied by Nylander to the last named condition. The color of the thallus varies 

 from the typical sordid-green to fuscescent. The very youngest apothecia are bay- 

 brown, but they blacken quickly. 



