LICHENS OF THE STATE OF WASHINGTON 169 



margin well developed, rarely both margins well developed and persistent ; 

 asci 1-8-spored, rarely 16-24-spored ; spores smoke gray (R), brown or 

 black, 1-3-septate, or sometimes muriform. 

 Alga Protococcus. 



A. Apothecia with prominent proper margin (lecideine) 67, Buellia 



A. Apothecia with prominent thalline margin (lecanorine) 68. Rinodina 



67. Buellia De. Not. Gior. Bot. Ital. 2:195. 1846. 



Thallus crustose or squamulose, uniform or marginally lobed, usually 

 without either cortex, if present only a rudimentary one. Apothecia circu- 

 lar, scattered, immersed to sessile; only proper margin present, soon dis- 

 appearing; hypothecium brown or black; paraphyses simple, or rarely 

 branched, usually enlarged at the tip; asci 1-8-spored; spores brown or 

 black, 1-3-septate or muriform, septa thick, without a mucilaginous halo. 



A. Thallus dark colored. 



B. Thallus squamulose 10. B. badia 



B, Thallus not squamulose. 



C. Thallus olive-gray, forming a thin fissured crust. 3. B. punctata 



C. Thallus not olive-gray, forming a thick folded 



crust 5. B. turgescens 



A. Thallus light colored. 

 D. On rocks. 



E. Thallus with a powdery appearance, disk usually white- 



pruinose, spores muriform when mature 6. B. alboatra 



E. Thallus without a powdery appearance, disk not white- 



pruinose, spores 1-septate 4. B. stellulata 



D. On trees, old wood, over moss or thin layer of soil. 



F. Spores always 1-septate 1. B. discijormis 



F. Spores not always 1-septate. 



G. Spores muriform when mature. 



H. Black hypothallus often conspicuous ; asci usually less 

 than 8-spored, spores large, usually more than 28 /x 



long 8. B. oidalea 



H. Black hypothallus not often conspicuous ; asci usually 

 8-spored, spores less than 28 ii long. 



I. Disk white-pruinose 6. B. alboatra 



I. Disk not white-pruinose 9. B. penichra 



G. Spores not muriform when mature. 



J. On mosses or soil, spores usually 1-septate. 2. B. papillata 



J. On trees or old wood, spores usually 3-4-locular. 



7. B. lauri-cassiae 



1. Buellia disciformis (Fries) Mudd, Manual Brit. Lich. 216. 1861. 



Lecidea parasema var. discijormis Fries Nov. Sched. Critic. 9. 1826. 

 Buellia parasema (Ach.) De Not. 



