148 26. PYRENOPSIDACEAE [95. Psorotichia 



1. Synalissa symphorea (Ach.) Nyl., Act. Soc. Linn. Bord. 21:264. 1856. 



Lichen symphoreus Ach., Lich. Suec. Prod. 135. 1798. Omphalaria symphorea 

 (Ach.) Tuck. 5. sphaerospora Nyl. 



Thallus minute to small, dull black, parallel to becoming dichotomously 

 branched, the branches short, round, obtuse, often densely clustered, becoming 

 nodular; apothecia minute to small, 0.08-0.2 mm. across, terminal, partly im- 

 mersed, the disk concave to flat or slightly convex, black, the exciple thick, col- 

 ored like the thallus; spores 16-24. ellipsoid to spherical, 9-12 X 6-9 fx. 



On calcareous rock, Alabama. 



OTHER SPECIES REPORTED 



Synalissa texana Tuck. — Texas. 



95. Psorotichia Mass., Fram. Lich. 15. 1855. 



Thallus crustose, granulose, becoming squamulose, devoid .of differentiation 

 into layers, attached to the substratum by hyphal rhizoids; apothecia minute to 

 small or rarely middle-sized, immersed to adnate, the disk closed to open and 

 concave to convex, the exciple thin, colored like the disk, often disappearing,' 

 commonly surrounded by a thicker thalloid one ; hypothecium hyaline to yellowish 

 brown; hymenium hyaline and brownish above; paraphyses unbranched, more or 

 less coherent; asci clavate to cylindrico-clavate; spores 8-32, hyaline, oblong to 

 ellipsoid or spherical, non-septate. 



The algal host is Xanthocapsa. 



A. Spores 8 in each ascus 



B. Apothecia minute, not more than 0.25 mm. across .... 2. P.segregata 

 B. Apothecia minute to small or larger, rarely less than 0.25 mm. across 



C. Thallus minutely granulose, olive-brown to blackish . . . 4. P. Hassei 



C. Thallus coarsely granulose, areolate-chinky, black .... 1. P. Schaereri 



A. Spores 16 in an ascus 3. P.squamulosa 



1. Psorotichia Schaereri (Mass.) Arm, Flora 52:265. 1869. 



Pannaria Schaereri Mass., Ric. Lich. 114. f. 225. 1852. Pyrenopsis Schaereri 

 (Mass.) Nyl. Synalissa Schaereri (Mass.) Tuck. 



Thallus composed of minute granules, crowded into a thin, black, irregular, 

 areolate-chinky, coarsely granulose to coralloid crust; apothecia small to middle- 

 sized, 0.4-0.8 mm. across, sessile, very numerous and often crowded, the disk flat, 

 brownish black to black, the exciple thin, black, becoming crenulate; hypothecium 

 yellowish brown; spores 8, oblong-ellipsoid, 12-20 X 7-10 ju, uniseriately to irreg- 

 ularly arranged. 



On rocks, New York, New Jersey, Alabama, Illinois, and California. 



2. Psorotichia segregata (Nyl.) Hasse, Cont. U.S. Nat. Herb. 17:68, 69. 1913. 



Collemopsis segregata Nyl., in Hasse, Lich. South. Calif, ed. 2. 6. 1898. 



Thallus composed of small, thin, smooth to rough, irregular, greenish black to 

 blackish nodules, sometimes forming a crust; apothecia minute, 0.15-0.25 mm. 

 across, slightly immersed to adnate, numerous, nearly covering the thallus, the 

 disk deeply concave to flat or slightly convex, dull reddish, the exciple colored 

 like the thallus, finally disappearing; hypothecium yellowish brown; spores 8, 

 oblong-ellipsoid, 16-19 X 9-10 /a, irregularly arranged. 



On soil, Santa Monica Range, California. 



3. Psorotichia squamulosa Zahlbr., Beih. Bot. Centralb. 13:158. 1902. 

 Thallus composed of small, tough, dark olive-green to dull black, 'broadly lobed 



squamules, sometimes forming a cushion-like mass; apothecia minute, 0.15-0.2 

 mm. across, immersed, the disk concave, brown, the exciple inconspicuous or 

 absent; hypothecium brownish yellow; asci long-cylindrical; spores 16, ellipsoid, 

 9-13X5-6 /a, irregularly arranged. 



