HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 123 
RINODINA (Ach.) S. F. Gray. 
Thallus uniform or effigurate and lobed at the periphery, destitute of rhizinee; apothe- 
cia lecanorine, the disk dark; spores commonly bilocular, rarely 4-locular; sterigma 
short, straight. 
KEY TO SPECIES. 
Substratum mineral. 
Substratum rock. 
Thallus not lobed at periphery, light gray............ 7. R. confragosa. 
Thallus lobed at periphery. 
Densely pruinose throughout..................... lb. R. radiata lactea. 
Not densely pruinose. 
Red brown to brown.............-....-.----- 4. R. thysanota. 
Lighter colored. 
Yellowish...........2.---..2..2..-..---. 2. R. oreina. 
Not yellowish. 
Whitish to gray. 
Conspicuously radiate-lobed at 
the periphery.....-....... 1. R. radiata. 
° Depauperate; radiate lobation 
lost.......-. eee eee ee eee ... la. R. radiata fim- 
briata. 
Sordid buff.. wee --.-.2-.. 3. R. angelica. 
Substratum earth; thallus not lobed. at periphery, uniform, 
dark. 
Spores 2-locular..............--2.-22.200020000200--- 5. R. turfacea. 
Spores becoming 4-locular.............-.-.....-..--.. 6. R. conradi. 
Substratum vegetable, bark or wood. 
Thallus brown, rimose.............-.-..------.------.--. ll. R. hallii. 
Thallus of some shade of gray. 
Dull greenish gray..........---222222..202.....-..--- 10, R. succedens. 
Of an ordinary gray. 
Thallus staining yellow with iodine.............. 12. R. roboris. 
Not staining yellow. 
Thallus effusely granular-areolate ........... 8. R. sophodes. 
Reduced, almost obsolete (¢ccurring also on 
rock)....-..--.022--2--2-2.000-2---.. 9 R. exiqgua. 
1. Rinodina radiata Tuck. 
Thallus whitish gray to gray, closely appressed, orbicular, in the center rimose- 
areolate, the periphery radiate-lobed, the radii flattening, somewhat dilated and lobu- 
late at the border, KHO—, Ca(ClO),—, the medulla with iodine—, a more or less 
distinct, black hypothallus encircling the thallus; apothecia crowded in the center, 
ianate then adnate, scarcely exceeding 0.8 mm. in width; disk flat then convex, often 
subpruinose, the thalline margin persistent, entire; epithecium subgranulose, yellowish 
grayish; thecium colorless, 84 to 88 » high, sometimes brownish tinged; paraphyses 
coherent, with brown tips, septate; hypothecium brown; asci clavate, the membrane 
thickened at top; spores ovoid-ellipsoid, constricted, brown, bilocular, 10 to 13 » long, 
6 to 7 # thick; spermogones designated by minute, black, funnelform depressions, 
their contents staining yellow with iodine; sterigma simple, straight, inverted club- 
shaped; spermatia short, straight, 8 to 12 « long, less than 1 » thick; thecium with the 
epithecium and hypothecium deep blue with iodine. 
On various rocks throughout the district; a Pacific Coast lichen. 
60653°—13——9 
