18 31. STICTACEAE [115. Sticta 



2. Sticta herbacea (Huds.) Ach., Syn. Lich. 341. 1814. 



Lichen herbaceus Huds., Fl. Angl. ed. 2. 2:544. 1778. Lobaria laetevirens 

 (Lightf.) Zahlbr. 



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

 wrinkled, often shiny, greenish gray to brownish or greenish brown, the lobes 

 small, round, sometimes imbricated, with crenate, incised margins; brownish below, 

 sparingly tomentose, bearing short brownish to brown rhizoids; apothecia middle- 

 sized to large, 1-3 mm. or more across, scattered, the disk concave to flat, reddish 

 to brownish, the exciple sometimes granulose; spores hyaline to brownish, fusiform, 

 1-septate, 26-44 X 9-11 ^. 



On trees, from Maine to Florida, and Illinois (?). 



3. Sticta erosa (Eschw.) Tuck., Syn. N. A. Lich. 1:93. 1882. 



Parmelia erosa Eschw., in Mart., Fl. Bras. 1:211. 1833. S.Ravenelii Tuck. 

 Lobaria erosa (Eschw.) Trevis. 



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

 minutely rough and becoming much wrinkled, greenish gray to brownish or yel- 

 lowish brown, the lobes somewhat elongated, often imbricated, incised, with cre- 

 nate margins; brownish below, bearing many, short, scattered, brownish to brown 

 fibrils; apothecia small to middle-sized, 1.2-3 mm. across, scattered, sessile to 

 substipitate, the disk becoming flat, chestnut-brown, the exciple thin, becoming 

 wrinkled and crenate; hypothecium cloudy; spores acicular, 3-septate, 48-70 X 



3-5 /t. 



On trees, South Carolina, Georgia, Florida, Alabama, and Louisiana. 



4. Sticta pulmonaria (L.) Bir., Fl. Ascon. 2:188. 1808. 



Lichen pulmonarius L., Sp. PI. 1145. 1753. S . puhnonacea var. hypomela Del. 

 Lobaria pulmonaria (L.) Hoffm. 



Thallus middle-sized to large, loosely attached to the substratum, plainly pitted 

 and reticulately ribbed, greenish gray to brownish or greenish brown, often grayish 

 sorediate or isidioid along the reticulations and margins, the lobes elongated, deeply 

 and narrowly divided, with somewhat blunt, notched apices; brownish to brown 

 below, clothed with a spongy nap of short rhizoids with many naked, raised, whit- 

 ish spots interspersed; apothecia middle-sized to large, 1.5-4 mm. across, subsessile, 

 submarginal, the disk flat to convex, chestnut-brown to brown, the exciple thin, 

 sometimes becoming wrinkled, finally disappearing; spores boat-shaped, 3-septate, 

 18-33 X 5.5-9 fi. (Plate 10.) 



On trees and rocks, throughout northern United States and southward in the 



mountains. 



5. Sticta linita Ach., Syn. Lich. 234. 1814. 



S. pulmonaria var. linita (Ach.) Tuck. Lobaria linita (Ach.) Rabh. 



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

 what pitted, brownish yellow to olive-green or brown, the lobes round, crenate, 

 rarely sorediate or coralloid; greenish brown below, bearing short, brown fibrils in 

 veins with pale, naked spots between; apothecia small to middle-sized, 0.8-2 mm. 

 across, submarginal, the disk flat, reddish brown, the exciple thin, becoming 

 wrinkled, finally disappearing; spores boat-shaped, 1-3-septate, 16-30X5-10^. 



On rocks, New Hampshire. 



6. Sticta oregana Tuck., Bull. Torr. Club 5:20. 1874. 

 Lobaria oregana (Tuck.) Mull. Arg. 



Thallus large, loosely attached to the substratum, much lobed, smooth to pitted 

 and reticulately ribbed, greenish to yellowish gray or brownish, the lobes broad, 

 elongated, much divided, with incised, crenate margins; yellowish to brownish 

 below reticulately marked with minute brown fibrils, naked whitish spots between; 

 apothecia middle-sized to large, 1.5-4 mm. across, scattered, the disk flat to slightly 



