THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 87 



On sandstone at Grizzly Peak at an altitude of 2775 feet. A 

 lichen of northern and alpine Europe; in America reported from 

 Greenland, Newfoundland, a number of localities in Canada, and 

 in Texas. 



13. LECIDEA TESSELLATA Flk. 



Lecidea tessellata Floerke, Deutsch. Lich. no. 64. 1815. 

 Lecidea tessellata Tuck. Syn. N. Am. Lich. II: 68. 1888. 



Thallus usually determinate and more or less orbiculate, limited 

 by a black hypothalline band or line which is rarely obsolete; uni- 

 form crustaceous, thick, sub-tartareous, of flat areoles, from deli- 

 cately rimose becoming plainly fissured; pale ashy gray or whitish 

 with a faint blue tinge; KOH ; CaCl 2 2 ; medulla without reac- 

 tion with I. 



Apothecia numerous, scattered or occasionally thickly grouped, 

 from small to medium and very large (2.5 mm. broad), innate to 

 sessile; disk flat to moderately convex, black, occasionally with a 

 faint bloom; margin thick, black, erect; persistent, sometimes 

 crisped or flexuous; a spurious thalline margin is seen with some 

 apothecia; epithecium bluish-black, paling downward; paraphyses, 

 coherent, strict; hymenium colorless or very pale blue, 80 n high, 

 blue with I; hypothecium colorless to pale ash-color, as high as the 

 hymenium; asci narrowly spatulate; spores rarely to be seen, 



6 6io 



A handsome and conspicuous lichen on igneous rocks in the foot- 

 hills, at elevations of a few hundred feet. Generally distributed 

 over Europe and North America. 



(tessellata, checkered, like a mosaic pavement, alluding to the 

 contrasting thallus and apothecia.) 



14. LECIDEA LAPICIDA (Ach.) Arn. 



Lichen lapicida Ach. Lich. Suec. Prodr. 61. 1798, exclud. syn- 



onymy. 



Lecidea lapicida Ach. Meth. Lich. 37. 1803. 

 Lecidea lapicida Arn., 



Lecidea pantherina v. lapicida Th. Fr. Lich. Scand. 2 : 493. 1874. 

 Lecidea polycarpa Tuck. Syn. N. Am. Lich. II : 69. i< 



