290 37. PERTUSARIACEAE [ 141. Pertusaria 



D. Exciple thin, entire 7. P. carneopallida 



D. Exciple irregular, appearing as 2 or 3 layers 6. P. ambigens 



C. On rocks; disk brownish to blackening 9. P. nolens 



A. On soil and over moss 



B. Thallus of coralloid branchlets 



C. Apothecia flesh-colored to blackish; spores 2-4 



in an ascus 18. P. globularis 



C. Apothecia flesh-colored, more or less covered by a thalloid 



veil; spores 1 in an ascus 5. P. dactylina 



B. Thallus of confluent, wartlike elevations 17. P. glomerata 



1. Pertusaria multipuncta (Turn.) Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:179, 



180. 1861. 



Variolaria multipuncta Turn., Trans. Linn. Soc. Lond. 9:137. pi. 10, f. 1. 1808. 

 P. communis var. sorediata E. Fries. P. jaginea Tuck. 



Thallus thin, smooth to chinky or warty-areolate, greenish gray to pale ashy; 

 apothecia small to middle-sized, 0.3-0.6 mm. across, 1-several immersed in each 

 wartlike elevation, with a minute, depressed, blackened ostiole, or becoming open 

 with a flat, pale to blackish disk and thin, irregular exciple, the apothecia finally 

 passing into powdery-sorediate heaps; spores 1 or rarely 2, ellipsoid to oblong- 

 ellipsoid, 75-170 X 25-65 /x. 



On trees, throughout the United States. 



var. ophthalmiza Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:180. 1861. P. multi- 

 puncta var. laevigata Turn. 

 Thallus thin and smooth; apothecia usually 1 in each wartlike elevation, becom- 

 ing open, with a flat, blackened disk and thin, irregular, thalloid exciple. 

 On trees, Minnesota and Washington. 



2. Pertusaria lecanina Tuck., Gen. Lich. 127. 1872. 



Thallus thin, smooth to slightly wrinkled, becoming granulose, yellowish to 

 ashy, sometimes bordered by a thin, black hypothallus; apothecia small to middle- 

 sized, 0.5-1 mm. across, adnate to sessile, the disk flat to slightly concave, thickly 

 white-pruinose to pale flesh-colored, the exciple thick, colored like the thallus, 

 slightly wavy; spores 2, ellipsoid, 96-140 X 34-48 \x. 



On trees, California. 



var. nigra Fink; Hedrick, Mycologia 26:966. 1934. 

 Apothecia becoming dull black or blackish pruinose; spores 100-128 X 40-50 fi. 

 On dead yew tree, at 3,000 feet, Montana. 



3. Pertusaria flavicunda Tuck., Proc. Am. Acad. 12:176, 177. 1877. 



Thallus thin, smooth to chinky-areolate, granulose or minutely warty, sulphur- 

 colored, the areoles becoming lobed toward the margin; apothecia small to middle- 

 sized, 0.6-1.5 mm. across, adnate, round to irregular, sometimes in groups of 2 or 

 more, the ostiole soon opening and the disk concave to flat, yellowish pruinose or 

 becoming blackish, the exciple colored like the thallus, becoming thin; hypothecium 

 hyaline to pale brownish; spores 2 or 3, oblong-ellipsoid, 60-90 X 38-52 [i. 



On rocks, California. 



4. Pertusaria velata (Turn.) Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:179. 1861. 

 Parmelia velata Turn., Trans. Linn. Soc. Lond. 9:142. pi. 12, f. 1. 1808. 

 Thallus round, rather thin to thick, smooth to folded, wrinkled, chinky or 



irregularly roughened and warty, greenish gray to ashy, commonly lighter and fre- 

 quently zonate toward the circumference; apothecia small, 0.3-0.5 mm. across, 1-2 

 or 3 immersed in small to middle-sized, wartlike elevations, the disk concave to flat, 

 irregular, yellowish to flesh-colored, sometimes white-powdery-sorediate, the thalloid 

 exciple thick, very rarely disappearing; spores 1 or rarely 2, oblong-ellipsoid, 150- 

 250 X 42-84 fi. (Plate 27 6.) 



On trees and rocks, throughout the United States east of the Rocky Moun- 

 tains (California?). 





