Lichens of Santa Cruz Peninsula 337 



gg. Sterile; lobes broad, foliaceous, black beneath, becoming 

 linear and white beneath 7. tnckcr/>ia/u\ 340. 



I. CETRARIA CALIFORNICA Tuckerman. 



Thallus tufted, fruticose, erect ; lobes spreading, flattened or 

 linear, much branched, their tips finely dissected ; color black 

 or very dark green; occasionally brownish green or dusky; 

 dull; beneath paler, usually olive green or brown, but varying 

 greatly; finally white with a tinge of greenish. Apothecia 

 terminal ; margin toothed or fringed, sometimes almost smooth ; 

 concolorous and dull, but sometimes shining and darker than 

 the thallus. 



On fences, shrubs, and twigs of trees. 



Found everywhere ; most abundant on Adenostoma^ at an 

 elevation of 1800-2000 feet. Our specimens small or dwarfed 

 when compared with those from other parts of the state. The 

 largest and most t3'pical plants with us occur on sheltered fences. 



I have specimens obtained at all elevations from the salt 

 marshes about San Francisco Bay to 3788 feet. 

 Cetraria calif ornica Tuck. Am. Jour. Sci. 28, 203. 1859 ' ^yn. 



N. Am. Lich. i : 29. 1882. 



2. CETRARIA CILIARIS (Ach.) Tuck. 



Thallus foliaceous, depressed, expanded, irregularly cut and 

 lobed ; lobes expanded and leafy, or more often narrowed, 

 crowded, ascendant, and much dissected ; margin of lobes not 

 ciliate, but crenate, and margined with minute black or dark 

 tubercles ; similar tubercles often appearing on the surface of 

 lobes, or even covering them; color dusky brown, but varying 

 from bright to dusky green, brownish, and dark brown ; beneath 

 brownish, wrinkled and pitted, and with occasional fibrils. 

 Apothecia terminal or marginal; disk chestnut; margin crenu- 

 late or minutely tuberculate. 



Habitat, trees, shrubs, and fences. Abundant throughout; 

 I have specimens from all altitudes from sea-level to 3000 feet. 



A careful examination of many specimens has failed to show 

 any according in character with the specific name, marginal 

 cilia or fibrils being invariably absent. 



