182 31. STICTACEAE [ 115. Sticta 



wide, somewhat imbricated, with crenate margins; brownish below and becoming 

 darker toward the center, clothed with a spongy nap of short rhizoids interspersed 

 with minute, whitish, sorediate cyphellae; apothecia middle-sized to large, 1.5-4 

 mm. across, scattered, sessile, the disk flat to convex, reddish brown to black, the 

 exciple thin, usually disappearing; spores fusiform, 3-septate, 23-31 X 7-10 /i,. 

 On trees and over moss, Maine, Washington, Oregon, and California. 



12. Sticta Weigelii (Ach.) Vainio, Lich. Bres. 1:189, 190. 1890. 



S. damaecornis var. Weigelii Ach., Lich. Univ. 446. 1810. Stictina Weigelii 

 (Ach.) Stizenb. 



Thallus small to middle-sized, rather closely attached to the substratum, smooth 

 to rarely somewhat wrinkled, greenish gray to brownish or lead-colored, the lobes 

 broad, somewhat imbricated, with crenate, commonly isidioid margins; brownish 

 to brown below, clothed with a soft nap of short rhizoids interspersed with small 

 to larger, concave, whitish cyphellae; apothecia middle-sized, 0.8-2 mm. across, 

 scattered, sessile, the disk flat, reddish brown, the exciple thin, soon disappearing; 

 spores fusiform, 1-3-septate, 26-36 X 6-9 fi. 



On trees and soil, North Carolina and Florida. 



13. Sticta fuliginosa (Dicks.) Ach., Meth. Lich. 280, 281. 1803. 



Lichen juliginosus Dicks., PI. Crypt. Brit. 1:13. 1875. Stictina fuliginosa 

 (Dicks.) Nyl. 



Thallus middle-sized to large, loosely attached to the substratum, smooth to 

 more or less pitted, greenish brown to brownish or lead-colored, more or less 

 covered with minute, blackish granules, the lobes round, somewhat imbricate, with 

 cut, crenate margins; brownish below, clothed with a soft nap of short rhizoids 

 interspersed with concave whitish cyphellae; apothecia small to middle-sized, 0.6- 

 1 mm. across, usually marginal, the disk fiat to convex, reddish brown, the exciple 

 thin, soon disappearing; spores fusiform, 1-3-septate, 25-46X7-9 /a. 



On trees and rocks, New England, North Carolina, Georgia, Minnesota, Ore- 

 gon, and California. 



14. Sticta sylvatica (Huds.) Ach., Meth. Lich. 281. 1803. 



Lichen sylvaticus Huds., Fl. Angl. 453. 1762. Stictina sylvatica (Huds.) Nyl. 



Thallus small to middle-sized, rather closely attached to the substratum, some- 

 times more or less pitted, smooth or bearing scattered grayish to darker isidia, 

 greenish brown to brownish or reddish brown, the lobes somewhat imbricate, with 

 wavy, crenate margins; brownish below and darker toward the center, clothed with 

 a soft nap of short rhizoids interspersed with minute to small, concave, whitish 

 cyphellae; apothecia small to middle-sized, 0.5-2 mm. across, marginal, sessile, the 

 disk flat to convex, reddish brown, the exciple thin, soon disappearing; spores fusi- 

 form, 1-3-septate, 25^16 X 7—9 ft. 



On trees and rocks over moss, Maine, New York, New Jersey, North Carolina, 

 and Alabama. 



15. Sticta quercizans Ach., Syn. Lich. 234, 235. 1814. 



Parmelia quercizans Ach., Lich. Univ. 464. 1810. Lobaria quercizans (Ach.) 

 Michx. 



Thallus small to middle-sized, rather closely attached to the substratum, 

 smooth or more or less isidioid especially along the margins, greenish gray to 

 brown or rarely reddish brown, the lobes somewhat elongated, rather narrow, 

 more or less divided, often imbricated, with irregular, ascending, crenate margins; 

 brownish to darker below, clothed with a spongy nap of short rhizoids inter- 

 spersed by the concave, whitish cyphellae; apothecia middle-sized, 1.5-3 mm. 

 across, submarginal or scattered, the disk flat, reddish brown, the exciple thin, 

 becoming wavy; spores fusiform, 3-septate, 26-40 X 7-10 p. 



On trees and over mosses, from Vermont to Florida, and westward to New 

 Mexico and Minnesota, and in Oregon. 



