388 44. PHYSCIACEAE [ 175. Anaptychia 



17. Physcia hispida (Schreb.) Frege, Deutsch. Bot. Tasch. 169. 1812. 

 Lichen hispidus Schreb., Spic. Fl. Lips. 126. 1771. P. tenella (Scop.) DC. 

 Thallus small, often growing in clusters covering large areas, loosely adnate to 



ascending, greenish gray, the lobes usually somewhat elongated, more or less 

 branched and often imbricated, the margins entire to crenate, sometimes ciliate, 

 usually swollen by a large air space often opening outward as a, terminal cavity; 

 white below, bearing light or darker rhizoids; apothecia small, 1-2.5 mm. across, 

 sessile to subsessile, the disk slightly concave to flat, commonly whitish pruinose, 

 but sometimes dark brown, the exciple entire to crenulate; spores oblong-ellipsoid, 

 12-18 X 6-9 [x. 



On trees and rarely on rocks, throughout northern United States. 



18. Physcia Leana Tuck., Proc. Am. Acad. 4:394. 1860. 

 Parmelia Leana Tuck., in Lea, Cat. PI. Cincin. 45. 1849. 



Thallus thin, smooth, more or less ascending, greenish gray to ashy, the lobes 

 narrow, elongated, and much branched, the branches often imbricated, the mar- 

 gins entire to crenate; pale below with few pale, marginal rhizoids; apothecia 

 small to middle-sized, subpedicellate, 0.3-0.6 mm. across, the disk concave, brown, 

 the exciple entire; spores 18-23 X 9-10 /x. 



On mosses, Ohio. (Material is doubtfully included.) 



19. Physcia crispa (Pers.) Nyl., Syn. Lich. 1:423. 1858. 



Parmelia crispa Pers., in Gaud., Bot. Voy. Uran. Phys. 196. 1826. P. crispa f. 

 hypomela Tuck. 



Thallus middle-sized, adnate, greenish gray to whitish or pinkish, the lobes 

 rather wide, not much elongated, palmately branched, somewhat imbricated, pow- 

 dery, and ascending at the wavy to crenate margins; pale below, with scattered 

 pale rhizoids, or rarely darkening; apothecia small to middle-sized, 2-4 mm. across, 

 sessile, the disk concave, chestnut-brown, the exciple incurved, crenate or granu- 

 late; spores oblong-ellipsoid, 15-24 X 8-11 [x. 



On trees and wood, from South Carolina to Georgia, and westward to Texas 

 and California. 



20. Physcia tribacia (Ach.) Nyl., Flora 57:48. 1874. 

 Parmelia tribacia Ach., Lich. Univ. 415. 1810. 



Thallus small to middle-sized, loosely adnate, greenish gray to ashy, sometimes 

 forming a crust toward the center, the flat lobes short, or becoming long and more 

 branched, the branches sometimes imbricated, with usually strongly ascending, 

 granulose, rarely crenate margins; whitish below, with rhizoids of the same color; 

 apothecia small, 1.5-2.5 mm. across, sessile to subsessile, the disk slightly concave 

 to flat, blackish brown to black, or obscurely whitish pruinose, the exciple entire 

 to crenulate; spores oblong-ellipsoid, 16-23X7-10/*. 



On trees and rocks, throughout the United States. 



OTHER SPECIES REPORTED 



Physcia adglutinata var. pyrithrocardia Mull. Arg. — Massachusetts. 



175. Anaptychia Koerb., in Mass., Mem. Lich. 33. 1853. 



Thallus foliose or fruticose, more or less lobed and branched, prostrate, ascend- 

 ing, or more or less upright, the branches short, flat or grooved, often ciliate, 

 attached to the substratum by rhizoids, differentiated into a more or less well- 

 developed upper cortex of interwoven hyphae, algal and medullary layers, and rarely 

 a thin, poorly developed lower cortex of interwoven hyphae; apothecia small to 

 large, sessile to pedicellate, the disk slightly concave to flat or convex, brown to 

 black or pruinose, the exciple colored like the thallus, more or less irregular; hypo- 

 thecium hyaline; hymenium hyaline or brownish above; paraphyses unbranched; 

 asci clavate; spores 8, brown, oblong to ellipsoid, 1-septate. 



The algal host is Protococcus. 



