362 41. CALOPLACACEAE [ 166. Caloplaca 



the disk concave to slightly convex, orange, the exciple of the same color as the 

 thallus, entire to crenulate, sometimes becoming wavy; spores ovoid-ellipsoid, 

 9-18 X 5-8.5 ft. (Plate 43 6.) 



On rocks, throughout the United States, chiefly confined to the mountains in 

 the South. 



var. trachyphylla (Tuck.) Fink n. comb. 

 Placodium elegans var. trachyphyllam Tuck., Syn. N. A. Lich. 1:170. 1882. C. 



trachyphylla (Tuck.) Zahlbr. 

 Thallus closely adnate, dark orange, roughened by minute or larger granules. 

 On rocks, Montana, Wyoming, and Nevada. 



35. Caloplaca microphylina (Tuck.) Hasse, Cont. U.S. Nat. Herb. 17:114. 1913. 

 Placodium micro phylinum Tuck., Syn. N. A. Lich. 1:174. 1882. 



Thallus of small, closely adnate squamules, sometimes forming an areolate 

 crust towards the center, dirty greenish yellow to orange, the marginal squamules 

 often crenately lobed, often obscured by minute yellow granules; apothecia minute 

 to small, 0.3-0.5 mm. across, adnate, the disk fiat, dark orange, the exciple greenish 

 yellow to orange or grayish or darkening, usually crenulate; spores ellipsoid, 9-15 

 X 5-7 /*. 



On old wood, throughout northern United States, and in California and Texas. 



36. Caloplaca eugyra (Tuck.) Zahlbr., Cat. Lich. Univ. 7:239. 1930. 

 Placodium eugyrum Tuck., Am. Journ. Sci. II. 25:425. 1858. 



Thallus thin, round to irregular, dirty brownish green to brownish yellow, 

 chinky-areolate, passing toward the margins into short, paler, white-powdery, cre- 

 nate lobes; apothecia small to middle-sized, 0.4-0.8 mm. across, adnate, the disk 

 flat, brownish yellow to reddish brown, the exciple thin, colored much like the 

 thallus, crenulate; spores ovoid-ellipsoid, 9-13 X 4-6.5 ft. 



On rocks, Texas and Colorado. 



37. Caloplaca teicholyta (Ach.) Stenr., Sitz. Kais. Acad. Wiss. 104 1 :388. 1895. 

 Lecanora teicholytum Ach., Lich. Univ. 425. 1810. Placodium teicholytum 



(Ach.) DC. 



Thallus thin, minutely granulose to powdery, rarely becoming radiately lobed 

 toward the circumference, pale greenish gray to ashy; apothecia small, 0.3-0.6 mm. 

 across, adnate to subsessile, the disk flat to slightly convex, orange to brownish 

 red, the exciple thick, colored like the thallus, elevated, rarely becoming powdery; 

 spores ellipsoid, 12-16 X 7—9 ft. 



On sandstone, southern California. 



38. Caloplaca peliophylla (Tuck.) Zahlbr., Cat. Lich. Univ. 7:262. 1930. 

 Placodium peliophyllum Tuck., Gen. Lich. 108. 1872. 



Thallus warty, greenish gray and blackening, the margins extended into many 

 narrow, linear, unequal lobes; apothecia middle-sized to large, 0.7-2 mm. across, 

 sessile, the disk flat, chestnut-brown, the exciple moderately thick, colored like 

 the thallus, becoming flexuous; spores ellipsoid, 14-20 X 5—9 ft. 



On granite rocks, California. 



39. Caloplaca galactophylla (Tuck.) Zahlbr., Cat. Lich. Univ. 7:239. 1930. 

 Placodium galactophyllum Tuck., Proc. Am. Acad. 12:171. 1877. 



Thallus well developed, dirty whitish, yellowish brown when rubbed, squamu- 

 lose to areolate, the areoles sometimes passing into crenate lobules at the margin; 

 apothecia minute to small, 0.2-0.6 mm. across, immersed to adnate, the disk flat, 

 cinnamon-brown, the exciple of the same color as the thallus, thick, entire to wavy; 

 spores oblong-ellipsoid, 10-15 X 5-7 ft. 



On calcareous rocks, Kansas and Missouri. 



40. Caloplaca coralloides (Tuck.) Hult., Hedwigia 35:187. 1896. 

 Placodium coralloides Tuck., Proc. Am. Acad. 6:287. 1866. 



Thallus of linear, subdichotomously branching, nodulose, bright yellow to orange 



