94. Synalissa] 26. PYRENOPSIDACEAE 147 



apothecia minute to small, 0.3-0.4 mm. across, more or less immersed, the disk 

 flat to slightly convex, reddish brown to brown, the thalloid exciple lighter; spores 

 ellipsoid, 16-18 X 8-10/*. 



On calcareous rocks, Kansas and Texas. 



6. Pyrenopsis fuscoatra Fink, Proc. Ind. Acad. Sci. 267. 1918. 



Thallus granulose, the granules minute, brownish black, flat or convex, usually 

 scattered or forming a thin, irregularly broken crust; apothecia minute, 0.2-0.3 

 mm. across, partly immersed to closely adnate, finally more or less open, the disk 

 concave to almost flat, brownish black, the thalloid exciple thin, black; spores 

 oblong-ellipsoid, 13-20 X 7-10 /x, irregularly arranged. 



On limestone, Indiana. 



7. Pyrenopsis lecideella Fink; Hedrick, Mycologia 25:314. 1933. 



Thallus minutely granulose, forming a thin, uneven, grayish to black, more 

 or less continuous crust; apothecia very minute to minute, 0.1-0.2 mm. across, 

 numerous, partly immersed to adnate, round, the disk slightly concave to flat and 

 convex, black, the thalloid exciple thin, entire, black, soon disappearing; spores 

 oblong-ovoid and flat on one side, 7-8 X 4-4.5 /*, irregularly arranged. 



On limestone, near Oxford, Ohio. 



8. Pyrenopsis phaeococca Tuck., Syn. N. A. Lich. 1:136, 137. 1882. 

 Synalissa phaeococca Tuck., Gen. Lich. 80. 1872. Psorotichia phaeococca 



(Tuck.) Hasse. P. subareolata Nyl. 



Thallus composed of reddish brown to blackish, coralloid granules, the gran- 

 ules finally crowded into a thin or moderately thick, areolate crust; apothecia 

 minute to small, 0.2-0.5 mm. across, immersed to adnate, 1-3 in each areole, the 

 disk concave, brownish black to black, the thalloid exciple thin, black; spores 

 ovoid-ellipsoid, rarely becoming 1-septate, 12-20 X 7-10 /x, irregularly arranged. 



On rocks, from Vermont to South Carolina, westward to Illinois and Minne- 

 sota, and reappearing in California. 



9. Pyrenopsis melambola Tuck., Syn. N. A. Lich. 1:136. 1882. 

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



Thallus composed of minute, greenish black granules, compacted into thick 

 and substipitate, rough, black areoles, forming a close crust; apothecia minute to 

 small, 0.15-0.4 mm. across, immersed 1-6 in each areole, the disk concave, black, 

 the thalloid exciple thin, black; spores ellipsoid, 8-12 X 5-8 fi, irregularly arranged. 



On rocks, Alabama, Missouri, Minnesota, and California. 



10. Pyrenopsis haemaleella (Nyl.) Blomb. et Forss., Enum. PI. Scand. 110. 1880. 

 Euopsis haemaleella Nyl., Flora 60:457. 1877. 



Thallus composed of minute, reddish brown to blackish squamules, finally 

 crowded into a thin, rough, subareolate crust; apothecia minute to small, 0.2-0.5 

 mm. across, closely adnate, numerous and often crowded, the disk concave, reddish 

 brown to black, the thalloid exciple thin, black; spores blunt-ellipsoid, rarely be- 

 coming 1-septate, 9-11 X 6-7 /x. 



On rocks, Massachusetts. 



94. Synalissa E. Fries, Syst. Orb. Veg. 1:297. 1825. 



Thallus fruticose, erect, much branched, the branches cylindrical to club- 

 shaped, clustered, nodular, devoid of differentiation into layers, attached to the 

 substratum by rhizoids; apothecia minute to small, terminal, the disk closed to 

 open and concave to convex, the exciple thick, colored like the thallus; hypothe- 

 cium hyaline to brownish; hymenium hyaline and brownish above; paraphyses 

 unbranched, slender; asci clavate; spores 8-32, hyaline, ellipsoid to spherical, 

 non-septate. 



The algal host is Gloeocapsa, growing in clusters in the upper portion of the 

 thallus. 



