348 HERRE 



concolorous soredia. Apothecia rare, without marginal radial 

 fibrils ; disk a very dark orange ; color of thallus a bright 

 orange-yellow. 



On rocks and earth. 



Only found thus far in Pilarcitos Creek Canon, at an altitude 

 of 200 feet ; where it is rather abundant on a sandstone cliff, 

 mingled with Ranialina Jionialca^ Sphcero^hortis globosus 

 Cetrarta glatica, Sticta scrobiculata^ Physcia leucomcla, Par- 

 inelia jiavicans^ and Cladonias. 



My specimens were compared with those in the Tuckerman 

 herbarium at Harvard by Professor Clara Cummings, of Wel- 

 lesley. Given by Tuckerman as growing on trees, but not 

 apparently doing so with us. The tree form is abundant fartlier 

 south in the coast ranges near Santa Barbara and in San Luis 

 Obispo County, on the twigs of various trees and shrubs. The 

 specimens collected there by Professor Dudley are darker 

 colored and the apothecia are numerous. 

 Lichen jiavicaiis Swartz, Fl. Ind. Occid. 3 : 1908. 1788. 

 Theloschistes jlavicans Norm. Gen. Lich. 17. 1852. 

 Physcia jlavicans DC. Fl. Fr. 2: 189. 1805; Crombie, Brit. 



Lich. I : 295. 1894. 



2. THELOSCHISTES PARIETINUS (L.) Norm. 



Thallus foliaceous, more or less orbicular, appressed ; lobes 

 short, blunt, thick, crenate ; somewhat pruinose. On fences 

 sometimes forming a thick, effuse crust ; color yellow to orange. 

 Apothecia inconspicuous, small to medium size ; margin thick, 

 prominent, entire, becoming flexuous ; finally disappearing ; 

 ^disk concolorous. 



On trees, rocks, roofs, and fences. 



Common in the lowlands and foothills about San Francisco 

 Bay, seemingly best developed on ^icrcus lobata. 

 Lichen -parietiims L. Sp. PI. 2: 1143. i753- 

 TJicIoschistes ^arictintis Norm. Nyt. Mag. Naturvid. 7 • 229. 



1853. 

 3. THELOSCHISTES POLYCARPUS (Ehrh.) Tuck. 



Thallus very small, sub-orbicular, stellate, or more often 

 effuse, closely appressed, yellow ; lobes much cleft, narrow. 



