190 33. LECIDEACEAE [119. Lecidea 



C. Spores 1-3- or several- to many-septate 



D. Spores 3- or rarely more septate, fusiform 125. Bilembia 



D. Spores 1-3- or commonly more septate, acicular 



E. Thallus crustose 126. Bacidia 



E. Thallus squamulose 127. Toninia 



B. Spores transversely and usually longitudinally septate 



C. Spores hyaline 128. Lopadium 



C. Spores brown 129. Rhizocarpon 



119. Lecidea Ach., Meth. Lich. 32. pi. 2, f. 1, 2. 1803. 



Thallus crustose, granulose, warty or areolate, rudimentary, devoid of differ- 

 entiation into layers and attached to the substratum by hyphal rhizoids ; apothecia 

 minute to middle-sized, more or less immersed to adnate or sessile, the disk flat 

 to convex, light-colored to black, the exciple colored like the disk, usually disap- 

 pearing; hypothecium hyaline to brown or black; hymenium hyaline to brownish 

 or brown above; paraphyses unbranched or enlarged and branched toward the 

 apices; asci clavate to cylindrico-clavate ; spores 8 to rarely more, hyaline, non- 

 septate to rarely appearing 1-septate, usually oblong or ellipsoid. 



The algal host is Protococcus. 



A. Apothecia light-colored to brownish or rarely brownish black 

 B. Hypothecium hyaline 



C. Thallus often disappearing 

 D. On old wood 



E. Disk brown to brownish black; spores 7-9.5 X 3-3.5 /* . 3. L. misella 

 E. Disk pale lead-colored to black; spores 5-7.5 X 2.5-3 /* 1. L. punctella 



D. On rocks; spores 8-12 X 4-7 /a 2. L. phaeophora 



C. Thallus usually persistent 



D. Thallus greenish gray to ashy, whitish, yellowish or rarely darker 

 E. On trees and old wood, rarely over moss 

 F. Thallus distinctly granulose 



G. Spores ovoid-ellipsoid or long-ovoid 



H. Thallus greenish gray to yellowish green, usually 



bordered and decussated by black lines . . 7. L. varians 



H. Thallus greenish gray to white 4. L. paddensis 



G. Spores globose, 4.5-7 /* across 9. L. Nylanderi 



F. Thallus smooth to chinky, scurfy or sorediate 



G. Apothecia flesh-colored to yellow or whitish 10. L. carneoalbens 



G. Apothecia pale yellowish to reddish brown . . . 5. L. vemalis 



G. Apothecia scarlet 8. L. cinnabarina 



E. On rocks and soil 



F. Thallus granulose-areolate 6. L. leucophaeoides 



F. Thallus squamulose 11. L. glebulosa 



D. Thallus rarely greenish gray, more or less brownish, 

 reddish brown or darker 

 E. On trees and old wood 



F. Spores less than 16 /* in length 



G. Apothecia 0.2-0.3 mm. across; spores 



10-15 X 3-5 fi 12. L. furvonigrans 



G. Apothecia 0.3-1.5 mm. across; spores 



9-14 X 4-7 /* 13. L. holopolia 



F. Spores 17-23 X 11-16 /* IS. L. tornoensis 



E. On rocks 



F. Spores oblong-ellipsoid, 9-12 X 3-5 /* 16. L. rivulosa 



F. Spores subglobose to ovoid, 6-9X5-6/* . . . . 14. L. mollis 

 B. Hypothecium hyaline to yellowish or rarely darker 

 C. Apothecia rarely more than 0.5 mm. across 



D. Apothecia lemon-colored; spores 4-7X2-3/* 19. L. lucida 



D. Apothecia pale to reddish brown or black; spores 



13-16X7-9/* 17. L. mutabilis 



