124 HERRE 



A A. Thallus not yellow. 



D. Thallus brown to chestnut. 



E. Thallus pale brown to chestnut; reddish with KOH +CaCl202 



4. fuscata 

 EE. Thallus very dark brown; not affected by reagents. .5. rufescens 

 DD. Thallus not brown, or else suffused with white, and the true color 

 not apparent. 



F. Squamulesvery small, more or less white pruinose... .6. obpallens 

 FF. Squamules not white pruinose. 



G. Thallus pale green-clay color to pale yellowish or dirty 



brown, of large thick scales 7. hassei 



GG. Thallus tliin, dirty grayish or sand-colored, of small, closely 

 appressed scales 8. arenosa 



I. ACAROSPORA CHLOROPHANA (Wahlb.) Mass. 



Parmelia chlorophana Wahlenberg, in Ach. Supplementum, Math. 



Lich, 44. 1803. 

 Acarospora chlorophana Mass. Ric. Auton. Lich. Crost. 27, /. 44. 



1852. 

 Lecanora chlorophana Ach. Lich. Univ. 436, 1810. 

 Lecanora chlorophana Tuck. Syn. N. Am. Lich. I: 201. 1882. 



Thallus of small, closely compacted, irregular, flattish or wart- 

 like areoles, closely appressed, their surface smooth; more or less 

 radiately lobed at the circumference; clear, very bright lemon- 

 color. KOH - ; CaClaOz - . 



Apothecia small, from innate and plane soon emergent and ses- 

 sile, finally of medium size; the concolorous disk eventually pale 

 brownish or dusky yellow; the thin entire margin becoming very 

 flexuous; I do not find it excluded as stated by Tuckerman; 

 epithecium granular, lemon-yellow; paraphyses free, their tips 



1-1.8 



enlarged; thecium deep blue with I; spores oblong or ovoid, [i. 



2-4 3 



One of the handsomest of crustaceous lichens. Abundant and 

 very noticeable on igneous rocks in the dry Inner Coast Range at 

 elevations of but a few hundred feet, but probably not occurring at 

 all in the moister Santa Cruz Peninsula. Common in alpine and 

 northern Europe and throughout western North America. 



