146 26. PYRENOPSIDACEAE [93. Pyrenopsis 



8, hyaline, ellipsoid or somewhat spherical, non-septate to rarely becoming 1- 

 septate. 



The algal host is Gloeocapsa. 



A. Spores rarely less than 14 ti in length 



B. On rocks; spores not more than 20 (i in length 

 C. Apothecia 1-3 in each areole 



D. Thallus of coralloid granules, finally crowded 



into an areolate crust 8. P. phaeococca 



D. Thallus of minute granules, finally crowded 



into an irregular crust 3. P. phylliscina 



C. Apothecia 1 in each areole 



D. Thallus pale bluish to sage-green 5. P. viridirufa 



D. Thallus brownish black 6. P. fuscoatra 



B. On soil; spores 22-30 n in length 4. P. compacta 



A. Spores not more than 14 /x in length 

 B. Spores more than 8 ai in length 

 C. Thallus minutely granulose 



D. Apothecia very numerous 1. P. polycocca 



D. Apothecia 1 or more in an areole 



E. Granules crowded into a subareolate crust ... 2. P. subfuliginea 

 E. Granules compacted into substipitate areoles . . . 9. P. melambola 



C. Thallus minutely squamulose 10. P. haemaleella 



B. Spores 7-8 /i in length 7. P.lecideella 



1. Pyrenopsis polycocca (Nyl.) Tuck., Syn. N. A. Lich. 1:136. 1882. 

 Synalissa polycocca Nyl., Syn. Meth. Lich. 1:96. 1858. 



Thallus granulose, blackish, the granules minute, round, soon passing into a 

 thin, broken, blackish to black crust; apothecia minute to small, 0.2-0.4 mm. 

 across, globose, closely adnate, very numerous and sometimes nearly covering the 

 thallus, the disk deeply concave and nearly closed, the thalloid exciple blackish or 

 black; asci cylindrico-clavate; spores ellipsoid, 10-14 X 6-8 /x, uniseriately to ir- 

 regularly arranged. 



On rocks, Vermont, Massachusetts, and Minnesota. 



2. Pyrenopsis subfuliginea Nyl., Flora 50:369. 1867. 



Thallus minutely granulose, the granules convex, crowded into a thin, blackish, 

 subareolate crust; apothecia minute, 0.15-0.3 mm. across, partly immersed, 1 or 

 more in an areole, the disk concave to almost flat, the thalloid exciple thin, black; 

 spores ovoid-ellipsoid, 9-14 X 6-9 At, irregularly arranged. 



On soil and rocks, Massachusetts. 



3. Pyrenopsis phylliscina Tuck., Syn. N. A. Lich. 1:137. 1882. 

 Synalissa phylliscina Tuck., Gen. Lich. 80. 1872. 



Thallus thin, composed of minute, brownish black granules, the granules finally 

 crowded into an irregular crust; apothecia minute, 0.2-0.3 mm. across, partly im- 

 mersed to adnate, 1-3 in each areole, the disk black, almost covered by a brownish 

 black, thalloid exciple; paraphyses few and short; asci clavate-f usif orm ; spores 

 ovoid-ellipsoid, rarely becoming 1-septate, 9-18 X 5-8 At. 



On granite rocks, near New Bedford, Massachusetts. 



4. Pyrenopsis compacta Willey, in Nyl., Lich. Jap. 102. 1890. 



Thallus thin, minutely granulose, the granules brownish black, flat to convex, 

 forming an irregular, continuous, or more or less broken crust; apothecia minute 

 to small, 0.25-0.4 mm. across, partly immersed, the disk finally convex, black, the 

 exciple thin, black, soon disappearing; asci cylindrico-clavate; spores ellipsoid, 

 22-30 X 10-14 At, biseriately to irregularly arranged. 



On soil, Massachusetts and Illinois. 



5. Pyrenopsis viridirufa Tuck., Syn. N. A. Lich. 1:137, 138. 1882. 

 Synalissa viridirufa Tuck., Proc. Am. Acad. 12:170. 1877. 



Thallus granulose, pale bluish to sage-green, the granules small, round, becom- 

 ing grouped into areole-like clusters and finally crowded into a thin chinky crust; 



