THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 221 



Abundant on Quercus agrifolia near Santa Cruz, and occasional 

 on trees at Los Gatos. 

 A widespread and variable lichen. 



9. RAMALINA FRAXINEA Ach. 



Lichen fraxineus Linne, Sp. Plantarum, 2: 1146. 1753. 



Ramalina fraxinea Ach. Lich. Univ. 602. 1810. 



Ramalina calicaris a. fraxinea Tuck. Syn. N. Am. Lich. I: 25. 1882. 



Thallus tufted, rigid, short, stout, the surface irregularly lacunose 

 or rugose; not sorediate; lobes short, broad, but little divided, some- 

 times with marginal lobules; dull gray-green. 



Apothecia medium, lateral or marginal, the receptacle rugose; disk 

 concave, very pale tan; spores curved or sometimes straight, 



ii - 17 



Our plant is small, not more than an inch in height, and reaching 

 but a small fraction of the size I have observed it to attain in the 

 Alps. 



Abundant on trees about Los Gatos and elsewhere in the foothills; 

 occurring in every quarter of the globe. 



10. RAMALINA RIGIDA Ach. 



Ramalina rigida Ach. Syn. Meth. Lich. 294. 1814. 

 Ramalina rigida Tuck. Syn. N. Am. Lich. I: 22. 1882. 

 Ramalina rigida Herre, Proc. Wash. Acad. Sci. 7: 335. 1906. 



Thallus small, tufted, erect, irregularly much-branched, terete, or 

 flattened and sometimes channelled; the branches slender, their tips 

 thin, filiform; color white to greenish white. 



Apothecia small, lateral, the disk greener than the thallus; spores 



bilocular, ellipsoid, -*- /*. 



12 l6 



This pretty little Ramalina has been collected on the trunks of 

 alders along Los Gatos Creek, near Wrights, at about 800 feet, in 

 Austrian Gulch, at 150x5 feet, and near Long Bridge, at about 800 

 feet. It is found very sparingly, growing with Ramalina farinacea 

 and Evernia prunastri, with young stages of which it is likely to be 

 confused. 



