LICHENS OF SANTA CRUZ PENINSULA 365 



Lichen tenellus Scopoli, Flora Cain, ed. 2. 2 : 394. 1772. 

 Physcia tcnclla Nyl. Flora 57 : 306. 1874. Nom. Nud. Medd. 

 Soc. Faun. Fl. Fenn. 13 : 49. 1886. 



12. PHYSCIA ADGLUTINATA (Floerk.) Nylander. 



Thallus small, inconspicuous ; very closely appressed so that 

 it appears to be a part of the substratum ; lobes thin, flat, coal- 

 escent ; center of thallus often crustose ; color " glaucescent 

 becoming cinerescent and brown, pale and scarcely fibrillose 

 beneath ; apothecia small and very small ; disk blackish brown ; 

 margin entire, scarcely ciliate." Tuckerman. 



On trees and shrubs. 



One olive-brown specimen of this obscure lichen was found 

 by me on Black Mountain, at an altitude of 2500 feet, growing 

 on the trunk of yEsculus californica. Unfortunately this speci- 

 men was afterward lost and at the time of writing no other 

 specimens had been discovered. 



Lecanora adgliitinata Floerke, Deutsch. Lich. 4: 7. 1815. 

 Physcia adglutinata Nylander, Syn. Meth. Lich. i : 428. 



i860. 



IX. Gyrophora Acharius. 



Thallus horizontal, foliaceous, one-leaved to polyphyllous ; 

 when dry very brittle and hard, but leathery when moist ; be- 

 neath naked or fibrillose ; attached to the substratum at one point 

 only, umbilicate. Apothecia innate or becoming prominent, 

 rounded or angulate, the surface gyrose-plicate, black ; spores 

 of our species simple, ellipsoid, colorless. 

 (ryrc'/Z^or^^ Acharius, Meth. Lich. no. 1803. 



KEY TO THE SPECIES. 



a. Thallus polyphyllous i. polyphylla^ 3^5' 



aa. Thallus one-leaved. 



b. Without fibrils beneath 2. phcca^ 366. 



bb. Fibrils present beneath 3. diabolica, 366. 



I. GYROPHORA POLYPHYLLA (L.) Turn. & Borr. 



Thallus small to medium size, many-leaved, crinkled, cespi- 

 tose ; surface smooth, often polished ; irregularly much lobed 

 and dissected, the erectish lobules often slender with dilated and 

 rounded tips ; marginally crenate, dentate, unevenly cut, or 



