90 HERRE 



i8. LECIDEA MELANCHEIMA Tuck. 



Lecidea melancheima Tuckerman, Proc. Am. Acad. Arts, and Sci. 



260. 1847. 

 Lecidea melancheima Tuck. Syn. N. Am. Lich. II: 81. 1888. 



Thallus creamy white, indeterminate, moderately thick, of irreg- 

 ularly shaped, conjointed and rimose, rugulose, sub-lobate squam- 

 ules or warts; KOH yellow; CaCl202 — . 



Apothecia numerous, 4 to i mm. wide, appressed to sessile; disk 

 glistening and very black, fiat to strongly convex, and then at times 

 tuberculate, often wavy; margin very thin, becoming fiexuous, 

 finally excluded; epithecium dark brown, gradually paling down- 

 ward; paraphyses loosely coherent; h3^othecium pale or colorless; 

 thecium 60 ,« high, colorless to light brown, blue with I; asci inflated 



clavate; spores ellipsoid, //; spermatia not seen. 



7 — 12 



On dead wood, fences, roofs, limbs of Pseudotsuga taxifolia, etc., 

 from sea level up to 3000 feet. 



Common in New England; Colorado; Central Europe. 



Lecidea elabens E. Fries, Act. Stock. 256, 1822, a similar plant 

 from northern and Alpine Europe, is different. Schaerer, Enum. 

 Crit. Lich. Europ. 131, says: "Apothecia atra, sub lamina cornea 

 strato inferiore carbonaceo, innata, immarginata; disco exasperate, 

 papillato. " 



19. LECIDEA OLIVACEA (Hoffm.) Mass. 



Verrucaria olivacea Hoffmann, Deutsch. Fl. 2: 192. 1791. 

 Lecidea olivacea Mass. Ric. Aut. Lich. Crost. 71. 1852. 

 Lecidea enteroleuca i.flavida Tuck. Syn. N. Am. Lich. II: 80. 1888. 

 Lecidea enteroleuca Hasse, Pacific Slope Lichens distrib. C. F. Baker, 

 no. 628. 1902. 



Thallus thin, effuse, of scattered, minute, scale-like granules, or 

 uniform crustaceous, of tiny areolate granules or crumbs, or becom- 

 ing warty and uneven; color from an olive-brown or yellowish to 

 greenish gray and whitish; KOH — ; CaCl202 brick-red or clay- 

 red. 



The forma geographica BagHetto is distinguished by the small, 

 thin to very thin, determinate thallus, sharply limited by the con- 



