Lichens of Santa Cruz Peninsula 329 



//. Apothecia yellow or orange ; spores bilocular, colorless. 



VI. Theloschistes^ 347* 

 kk. Thallus not bright yellow or orange. 



771. Thallus horizontal, orbicular or variously lobed ; under 

 surface with veins or cyphels. 

 71. Thallus pale or whitish beneath, with brown veins 

 and fibrils ; apothecia adnate on tips of more or 



less elongate lobes XII. Peltigera^ 372. 



7171. Thallus pale villous beneath, with large pale naked 



spots or small white cyphels X. Siicta, 367. 



mTn. Without veins or cyphels on under surface. 

 o. Spores simple, colorless. 

 p. Thallus flat, usually appressed ; under surface 

 brown or black, more or less clothed with 

 black fibrils; apothecia scattered over surface 



of plant VII. Par77telia, 350. 



pp. Thallus sub-fruticose, compressed; apothecia 

 marginal or on tips of ascendant lobes. 



II. Ceiraria, 336. 

 00. Spores bilocular, brown VIII. P/iyscia, 359. 



2. Fruticose Lichens. 



Plants more or less erect and shrub-like, or drooping and pendulous. 



a. Thallus of two kinds: (i) a horizontal, more or less leafy or 



granulose one; (2) a more prominent, erect, and caulescent 



one, simple and club-, cup- or funnel-shaped, or slender and 



much branched; apothecia, when present, scarlet or brown. 



XIX. CladoTiia., 3S6. 

 aa. Thallus uniform ; not two-fold. 



b. Apothecia globose, terminal ; plant tufted, shrub-like, gray. 



XXI. Sphcerophorus., 39^. 

 bb. Apothecia dish- or shield-like; terminal, marginal, or more 

 rarely scattered. 

 c. Thallus hair-like. 



d. Brown or black, like tangled mats of fine hair; on shrubs 



and trees ; sterile V. Alecioria., 346. 



dd. Color not black or brown. 



e. Thallus erect or decumbent, densely tufted, intricately 

 branched, terete, gray; sterile; on maritime rocks. 



XX. Dendrographa^ 392- 

 ee. Thallus coarser, gray or pale straw-color, rarely red ; 



