196 33. LECIDEACEAE [119. Lecidea 



12. Lecidea furvonigrans (Tuck.) Zahlbr., Cat. Lich. Univ. 3:762. 1925. 

 Biatora furvonigrans Tuck., Syn. N. A. Lich. 2:129. 1888. 



Thallus thin, widespread, unequal, brown, the hypothallus black; apothecia 



minute, 0.2-0.3 mm. across, sessile, the disk convex, brown to blackish, the exciple 



disappearing; hypothecium hyaline; spores oblong, 10-15X3-5//.. 



On trees, Washington. 



13. Lecidea holopolia (Tuck.) Zahlbr., Cat. Lich. Univ. 3:782. 1925. 

 Biatora holopolia Tuck., Syn. N. A. Lich. 2:26. 1888. Biatora pullata Tuck. 

 Thallus granulose, olive-brown to blackening, the granules coarse, tough, round, 



scattered or finally crowded; apothecia middle-sized, 0.3-1.5 mm. across, adnate, 

 the disk flat, becoming convex, rusty red and blackening, the exciple blackish, 

 thick, becoming wavy-lobed; hypothecium hyaline; spores ovoid, 9-14 X 4-7 p.. 

 On old wood, Washington and California. 



14. Lecidea mollis (Wahl.) Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:223. 1861. 

 L.rivulosa var. mollis Wahl., Fl. Lapp. 472. 1812. 



Thallus rough or slightly scurfy, chinky-areolate, becoming verrucose, green- 

 ish- or reddish-gray to brownish gray or blackish brown, bordered and dissected 

 by a black hypothallus; apothecia middle-sized, 0.7-1.2 mm. across, adnate to 

 sessile, the disk flattish, from flesh-colored soon brown to black, sometimes white- 

 pruinose, the exciple black, soon flexuous, rarely disappearing; hypothecium hya- 

 line ; spores subglobose to ovoid, 6-9 X 5-6 //.. 



On rocks, New Hampshire. 



15. Lecidea tornoensis Nyl. et Saelan, Herb. Muse. Fenn. 110. 1859. 

 Biatora tornoensis (Nyl. et Saelan) T. Fries. 



Thallus granulose, olive-greenish brown, the granules flattened, crowded and 

 passing into an irregular, sometimes chinky-areolate crust; apothecia small, 0.3- 

 0.8 mm. across, adnate to subsessile, clustered and confluent into variously irreg- 

 ular masses, the disk becoming strongly tuberculate, reddish brown to blackish, 

 the exciple evanescent; hypothecium hyaline; spores short-ellipsoid, 17-23 X 

 11-16 yu. 



On trees, shrubs, and old wood, New Hampshire, Washington, and California. 



16. Lecidea rivulosa Ach., Meth. Lich. 38. 1803. 

 Biatora rivulosa (Ach.) E. Fries. 



Thallus rough, chinky-areolate to granulose or verrucose, greenish gray to 

 reddish brown to blackish brown or mouse-colored, the hypothallus black; apothe- 

 cia middle-sized, 0.7-1.3 mm. across, sessile to adnate, the disk flattish, slightly 

 rough, becoming flexuous and irregular, dusky flesh-colored to brown or black, 

 the exciple thin, paler, rarely disappearing; hypothecium hyaline; spores oblong- 

 ellipsoid, slightly curved, 9-12 X 3-5 fx. 



On rocks, New England, Pennsylvania, North Carolina, South Carolina, Ten- 

 nessee, and Washington. 



17. Lecidea mutabilis Fee, Mem. Mus. Hist. Nat. Strasb. 2 K :105. 1835. 

 Biatora mutabilis (Fee) Mont. 



Thallus rather thin, granulose, continuous, ashy gray, the granules small, 

 closely crowded and becoming scurfy; apothecia minute to small, 0.2-0.5 mm. 

 across, adnate, the disk flat or finally convex, pale to reddish brown or black, the 

 exciple thin, soon disappearing; hypothecium hyaline to yellowish; spores ovoid- 

 ellipsoid, 13-16 X 7-9 /a. 



On trees, Florida, Louisiana, Minnesota, and California. 



18. Lecidea congesta Fink; Hedrick, Mycologia 26:155. 1934. 



Thallus of small, round to slightly irregular, often scattered, greenish gray to 

 dirty brown or darker warts; apothecia small to middle-sized, 0.4-1.8 mm. across, 

 adnate, the disk slightly to strongly convex, light to darker brown, the exciple 



