THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 1 19 



Thallus small to medium size; many-leaved, crinkled, cespitose; 

 surface smooth, often polished; irregularly much lobed and dis- 

 sected, the erectish lobules often slender with dilated and rounded 

 tips; marginally crenate, dentate, unevenly cut,orerose; sometimes 

 minutely and excessively dissected and crisped; color black or very 

 dark brown; beneath naked, finely granulate, dull black. Sterile. 



Not rare on the high sandstone cHffs at the head of Devil's Canon, 

 at an altitude of 2300 feet, mingled with Gyrophora polyrrhiza. 

 Also growing alone in considerable abundance on precipitous rocks 

 on Mount San Bruno, at about 1000 feet. 



Widely distributed in Europe, Asia and North America. 



2. GYROPHORA PH^A (Tuck.) Herre. 



Gyrophora phcea Herre, Proc. Wash. Acad. Sci. 7 : 366. 1906. 

 Umbilicaria phaa Tuck. Lich. Calif. 15. 1866. 

 Umbilicaria ph<xa Tuck. Syn. N.Am. Lich. 1 : 86. 1882. 

 Umbilicaria phcza Cummings, Williams, and Seymour, Decades 



of N. Am. Lichens no. 157, Moreno, California. 

 Umbilicaria phcBa Hasse, in Seedless Plants of So. Calif, by A. J. 



McClatchie, 369; no date. 

 Umbilicaria phcea Macoun, Cat. Canadian Plants, VII: 80. 1902. 



Vancouver Island. 



Thallus small to medium, one-leaved or occasionally polyphyl- 

 lous, smooth above; color brown, but varying from greenish or 

 grayish to olive or dark tawny brown; under surface without fibrils, 

 granular; usually darker brown or blackish, but sometimes paler. 



Apothecia numerous, black; at first innate but finally prominent; 



20 

 angular or rounded, their surface plicate; asci — ,«. ; spores simple, 



- o 



colorless to brown, variously arranged in the asci, /'• 



■^ ^ ' 10 - 13.5 



On bare, exposed sun-blistered rocks; most frequently on sand- 

 stone but also on igneous rocks. According to Tuckerman, found 

 only between 1000 and 3000 feet altitude, but really extending 

 much above and below these limits. Occurring in the Santa Cruz 

 Mountains from Searsville Ridge, at an elevation of about 350 feet, 

 to the summit of Loma Prieta, 3793 feet. In the Mt. Hamilton 



