170. Leciographa] 43. BUELLIACEAE 373 



Thallus immersed in that of the host and invisible, but deforming the hostal 

 thallus; apothecia minute to small, 0.15-0.5 mm. across, adnate, the disk flat to 

 convex, brown to black, the exciple prominent, black, and commonly disappearing; 

 hypothecium brownish black; spores ellipsoid, 10-15X3.5-6/*. 



On Parmelia saxatilis and Parmelia Borreri, from New England to California, 

 northward to Minnesota, and southward to Arkansas. 



6. Buelliella Nuttallii (Calkins & Nyl.) Fink n. comb. 

 Lecidea Nuttallii Calkins & Nyl, Bot. Gaz. 22:334. 1896. 



Thallus immersed in that of the host and invisible; apothecia minute, 0.1-0.3 

 mm. across, subsessile, the disk flat, black, the exciple thick, black, prominent, 

 rarely disappearing; hypothecium dark brown; asci clavate; spores oblong to 

 oblong-ovoid, sometimes slightly constricted, 12-15X5-6/*. 



On the thallus of Sticta erosa, West Virginia. 



7. Buelliella Usneae (Linds.) Fink n. comb. 



Abrothallus Usneae Linds., Trans. Roy. Soc. Edinb. 24:444. 1866. 



Thallus immersed in that of the host and invisible; apothecia minute, 0.05- 

 0.1 mm. across, adnate, the disk flat to slightly convex, black, the exciple thin, 

 black, disappearing; hypothecium brown; spores oblong-ellipsoid, 8-12X4-5/*. 



On Usnea barbata, Colorado. 



170. Leciographa Mass., Gen. Lich. 14. 1854. 



Thallus imbedded in that of the lichen host and therefore invisible ; apothecia 

 adnate to sessile, hard, the disk and exciple brownish black to black; hypothecium 

 brown to brownish black or tinged reddish; hymenium hyaline to brownish above; 

 paraphyses rarely branched; asci broadly clavate; spores 8, brown, oblong- 

 ellipsoid to fusiform, usually 3-septate. 



The algal host is Protococcus. 



A. Spores 1-3-septate 4. L. pertusaricola 



A. Spores 3-septate 



B. Exciple thin 1. L. parasitica 



B. Exciple thick, somewhat wrinkled 



C. Spores 21-26 X 7.5-9 /* 2. L. glaucomaria 



C. Spores 11-16 X 4.5-7 , a 3. L. glaucomarioidea 



1. Leciographa parasitica (Floerke) Mass., Gen. Lich. 14. 1854. 



Lecidea parasitica Floerke, Deutsch. Lich. no. 101. 1819. Buellia parasitica 

 (Floerke) T. Fries. 



Thallus imbedded and invisible; apothecia minute, 0.1-0.2 mm. across, sessile, 

 the disk flat to slightly convex, black, the exciple thin, black; hypothecium dark 

 brown; spores ellipsoid, 3-septate, 10-16X3-6/*. 



On the thalli of species of Lecanora and Pertusaria, Minnesota, Michigan, Cali- 

 fornia, and Oregon. 



2. Leciographa glaucomaria (Nyl.) A. L. Smith, Brit. Lich. 2:186. 1911. 



Lecidea glaucomaria Nyl, Bot. Not. 1852. 177. 1852. Buellia glaucomaria 

 (Nyl.) Tuck. 



Thallus imbedded and invisible; apothecia minute, 0.05-0.15 mm. across, adnate, 

 sometimes heaped, the disk flat, black, the exciple thick and somewhat wrinkled; 

 hypothecium brownish black; spores oblong-ovoid, 3-septate, hyaline to brown, 

 21-26 X 7.5-9/*. 



On thalli of species of Lecanora and Pertusaria, Massachusetts and Minne- 

 sota. 



3. Leciographa glaucomarioidea (Willey) Fink n. comb. 



Buellia glaucomarioidea Willey, Enum. Lich. New Bedford, Mass. 27. 1892. 

 Thallus imbedded and invisible; apothecia minute, 0.05-0.15 mm. across, adnate, 

 often clustered or heaped, the disk flat, black, the exciple thick, black, somewhat 



