THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 237 



On trees and shrubs in the maritime region and in the lower foot- 

 hills. 



In the Tuckerman Herb, are specimens found on bushes at Mare 

 Island, collected by Charles Wright, and others simply marked 

 "California," growing on jEsculus, with Placodium gilva. 



This insignificant little plant is too readily overlooked. It resem- 

 bles Candelaria concolor, from which it may be best distinguished by 

 the difference in spores. 



LX. Theloschistes Norm. 

 Theloschistes Norman, Con. Gen. Lich. 16. 1852. 



Thallus fruticose, erect or decumbent, branched; structure radial, 

 alike on all sides, without rhizoids. 



Apothecia circular, sessile, plate-shaped, with thalline margin; 

 spores colorless, polar-bilocular to 4-locular. 



A small genus of wide distribution, usually living on bark. 



KEY TO THE SPECIES. 



A. Thallus sub-terete; apothecial margin sub-crenulate . . . i. flavicans 

 A A. Thallus compressed; apothecia with marginal radiate fi- 

 brils 2. chrysophthalmus 



i. THELOSCHISTES FLAVICANS (Sw.) Norm. 



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

 Theloschistes flavicans Norman, Gen. Lich. 17. 1852. 

 Theloschistes flavicans Herre, Proc. Wash. Acad. Sci. 7: 348. 1906. 

 Theloschistes chrysophthalmus b. flavicans Tuck. Syn. N. Am. Lich. 



I: 49. 1882. 



Thallus tufted, elongated, erect and spreading, becoming decum- 

 bent, sub-terete; branches numerous, narrow to linear, more or less 

 twisted and pitted or channelled; margins with numerous small con- 

 colorous soredia; color a bright orange-yellow. 



Apothecia rare, without marginal radial fibrils; disk a very dark 

 orange; margin sub-crenulate; my specimens do not yield me spores 



but examples from Santa Barbara have spores, -^ ^^ /*. 



12 - 14.75 r 



On rocks, earth, and shrubs. Rather abundant on a sandstone 

 cliff in Pilarcitos Creek Canon, altitude about 200 feet. It also 

 occurs sparingly on the twigs of dwarf Baccharis and Vaccinium on 



