THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 1 55 



XXXVIII. Lobaria (Schreb.) Hue. 



Lobaria Schreber, Gen. PI. Ed. VIII, 2: p. 768. 1791. 

 Lobaria Hue, Nouv. Archiv d. Mus. Ser. IV, 3: 1901. 



Thallus large, leaf-like, the lobes expanded; under surface villous 

 or fleecy, interspersed with large, naked, pale spots. Spores color- 

 less or brown, 2-10 locular, spindle or needle-shaped. 



A large genus, best represented in the rainy tropics, living on bark, 

 moss and rocks. 



KEY TO SPECIES. 



A . Under side of thallus with large convex spots, more or less brown 

 veined between them i. pulmonarta 



AA. Spots small, white or pale, flat or sunken, scattered through the 

 dense dark nap 2. scrobiciilata 



I. LOBARIA PULMONARIA (L.) Hoffm. 



Lichen pulmonarius Linne, Fl. Suec. Prodr. 1087. 1755. 

 Lobaria pulmonaria Hoffm. Deutsch. Fl. 2 : 146. 1795. 

 Sticta pulmonaria Tuck. Syn. N. Am . Lich. I. 96. 1882. 

 Sticta pulmonaria Herre, Proc. Wash. Acad. Sci. 7: 368. 1906. 



Thallus leathery, medium to very large, irregularly and loosely 

 lobed, the surface reticulate and deeply pitted; lobes narrow, deeply 

 and sinuously crenate, the margins and reticulations often sorediose 

 or isidiose; color varying from bright green to ohvaceous and yellow- 

 ish brown; under surface pale or dark brown villous veined, between 

 large, pale, naked, bullate spots. 



Apothecia infrequent, marginal, small, the disk red-brown; spores 



colorless, 2-4 locular, — '- ^ fJ-. 



22 - 29.5 



Common on trunks of trees in the mountains above 1500 feet; 

 reaching its best development in the redwoods at about 2000 feet 

 altitude, the immense lax lobes sometimes having a spread of nearly 

 two feet. Occurring also on shaded mossy sandstone in Devils 

 Canon, at 2300 feet. 



A cosmopolitan lichen. 



Proc. Wash. Acad. Sci., May, 19 10. 



