119. Lecidea] 33. LECIDEACEAE 193 



D. Spores rarely less than 10 n in length 

 E. On rocks and soil 



F. Apothecia 0.4-0.8 or 1 mm. across 



G. Exciple thin, finally disappearing .... 73. L.promiscens 



G. Exciple thick, ashy pruinose 71. L.cinerata 



F. Apothecia 0.2-0.4 mm. across 98. L. humosa 



E. On old wood 72. L. diapensiae 



C. Thallus usually persistent 



D. Thallus greenish gray to ashy, whitish or yellowish, rarely darker 

 E. Spores rarely less than 10 n in length 



F. Thallus more or less distinctly areolate 

 G. Disk more or less pruinose 

 H. Thallus continuous 



I. Spores rarely less than IS fi in length 

 J. Thallus moderately thick, chinky to 



indistinctly areolate . . . 103. L. albocaerulescens 

 J. Thallus smooth, then warty, chinky 



or subareolate 79. L. cinereoatra 



I. Spores 10-14 X 6-7 n 90. L. grisella 



H. Thallus scattered or irregularly spread 



I. Thallus thin ; apothecia 0.4-2.5 mm. across 77. L. platycarpa 

 I. Thallus thicker; apothecia 0.5-1 .5 mm. 



across 91. L. contigua 



G. Disk never pruinose 



H. Apothecia rarely clustered 



I. Thallus without a black hypothallus 

 J. Disk becoming irregular and lobed 



K. Thallus thick, granulose to areolate . 88. L. latypea 

 K. Thallus thin, smooth to chinky 



or subareolate . . . . 88. L. latypea aequata 

 J. Disk regular and entire 



K. Showing a whitish hypothallus . . 78. L. speirea 

 K. Areoles more or less plainly lobed 94. L. mamillana 

 I. Thallus with a black hypothallus 



J. Thallus ashy to ashy brown . . 93. L. fuscocinerea 



J. Thallus pale yellow 89. L.aglaea 



H. Apothecia clustered and irregular 



I. Thallus ashy to whitish 81. L. vorticosa 



I. Thallus greenish gray to ashy or rust-red . 80. L. lapicida 

 F. Thallus smooth to warty or granulose 

 G. On trees and over moss 



H. On trees 75. L. euphorea 



H. Over moss 



I. Apothecia sometimes crowded, disk black . 85. L. limosa 

 I. Apothecia rarely crowded, disk brown 



to blackish 86. L. fusca 



G. On rocks 



H. Thallus minutely granulose; spores 



10-13 X 5-6 ii 76. L. fuscorubens 



H. Thallus warty to granulose; spores 



10-14 X 6-10 ix. 83. L. goniophila 



E. Spores rarely more than 10 /x in length 

 F. On rocks and moss 



G. Apothecia less than 0.5 mm. across 



H. Spores 5-8 X 2-3.5 fi 87. L. planetica 



H. Spores 8-11 X 3-4 ii 84. L. neglecta 



G. Apothecia more than 0.5 mm. across ... 82. L. auriculata 



F. On old wood 92. L. flexuosa 



D. Thallus greenish gray to olivaceous, reddish, brownish, or blackening 

 E. Spores rarely less than 10 n in length 

 F. Thallus granulose to areolate 

 G. On trees 



H. Thallus wrinkled-granulose to warty ; 



apothecia 0.3-0.4 mm. across . . . 102. L. xanthococcoides 



