248 HERRE 



/. Thallus faint yellow with KOH ; paraphyses 



agglutinate 9. roboris 



II. Thallus not affected by KOH ; paraphyses 

 free; spores smaller than in roboris. 



10. exigua 



I. RINODINA RADIATA Tuck. 



Buellia radiata Tuck. Lich. Calif. 25. 1866. 



Rinodina radiata Tuck. Proc. Am. Acad. Arts. & Sci. new series, 



4: 173. 1877. 

 Rinodina radiata Tuck. Syn. N. Am. Lich. I: 205. 1882. 

 Lecanora radiata Hasse, Lich. So. Calif, ed. 2. 11. 1898, 



Thallus more or less orbicular, adnate, rather thin, small or 

 medium, or spreading through the coalescence of several plants; the 

 rather broad marginal region radiately lobed, irregularly crenate and 

 cleft, the lobules convex or flattened; remainder of thallus of small, 

 irregular, flattish areoles, forming a uniform fissured crust. Margin 

 white to gray; central portion dusky gray to blackish; a black fring- 

 ing hypothallus often visible; KOH— ; CaCl202 — . 



Apothecia from small and innate emerging and becoming sessile 

 and sub-globose; disk plane, at last strongly convex, black; naked, 

 or more often white pruinose, with entire or irregular whitish thai- 

 line margin which rarely disappears; epithecium thin, granulose, 

 brown; paraphyses short, free, simple, their tips somewhat enlarged, 

 pale yellowish brown; hypothecium dusky or blackish brown; asci 

 short, cylindrical-clavate or ventricose; thecium deep blue with I; 



spores short ellipsoid, q~ '— fL 



Abundant on rocks in the maritime area; usually closely associ- 

 ated with Buellia stellulata. Probably confined to the coast ranges 

 of California. 



Under unfavorable conditions the thallus is poorly developed, 

 without the radiately lobed margin, but remains uniform, being 

 then the variety fimbriata of Tuckerman. 



2. RINODINA OREINA (Ach.) Mass. 



Lecanora straminea /? oreina Ach. Lich. Univ. 433. 1810. 

 Rinodina oreina Mass. Ric. Lich. Crost. 16. 1852. 

 Rinodina oreina Tuck. Syn. N. Am. Lich. I: 206. 1882. 



