126 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
thecium subcontinuous, dark yellowish brown; thecium colorless, 76 to 80 p high; 
paraphyses loosely coherent, the tips clavate and colored; asci inflated-clavate, 70 
to 72 long, 20 « thick, the membrane thickened at top; hypothecium pale yellow- 
ish; spores 8, brown, blunt-ellipsoid and oblong-ellipsoid, 18 to 24 long, 11 to 13 4 
thick, barely or not at all constricted, some slightly curved, bilocular, brown, the 
lumina roundish, gray; hymenial gelatine blue with iodine. 
On rocks in the Santa Monica Mountains. Widely distributed throughout North 
America. 
8. Rinodina sophodes (Ach.) T. Fries. 
Thallus dark grayish brown, granulate-areolate, interruptedly limited by a black 
hypothalline border, KHO—, Ca(ClO),—; apothecia numerous, small, 0.35 to 0.5 
mm. wide; disk plane and planoconvex, dull black with a thin crenulate lecanorine 
margin, later becoming almost obsolete; epithecium subcontinuous, sordid yellowish 
brown, pale to dark; thecium colorless, 100 to 108 » high; paraphyses coherent, some 
with small brown heads; hypothecium sordid pale yellowish; asci inflated-clavate; 
spores 8, oblong-ellipsoid, brown, bilocular, 16 to 20 » long, 8 to 10 jx thick, the epispore 
thick, the lumina oblong, gray, the spores mostly a little curved; all hymenial struc- 
tures stained a handsome blue with iodine, no change with KHO. 
On various barks, common throughout North America: it is found in Europe, North 
Africa, Asia, and Oceania. 
9. Rinodina exigua (Ach.) T. Fries. 
Thallus thin, whitish or ash-colored, effuse, granular, or disappearing; apothecia 
smaller than those of R. sophodes; epithecium brown, subgranulose; thecium 70 to 80 
high, with iodine blue; paraphyses loosely coherent, the tips brownish-capitate; 
hypothecium pale yellowish; asci inflated-clavate; spores oblong-ellipsoid, brown, 
bilocular, 15 to 20 4 long, 8 to 9 » thick; disk black, convex, the lecanorine margin 
white, entire. 
With and as common as R. sophodes. 
10. Rinodina succedens Nyl. 
Lecidea succedens Ny. Flora 49: 372. 1866. 
Rinodina succedens Nyl.; Macoun, Cat. Canad. Pl. 117. 1902. 
Thallus dull greenish ash color, rugose-verrucose, indistinctly rimose, KHO—, 
Ca(C1O),—; apothecia sessile, 0.5 to not over 1 mm. wide; disk dull black, concave 
to flat; thalline margin persistent, turgid, entire, seldom slightly crenulate; epithecium 
subcontinuous, sordid pale yellowish ash color; thecium colorless, 136 to 140 » high; 
paraphyses loosely coherent, slightly thickened and colored like the epithecium 
at the tips; hypothecium pale straw color; asci clavate and inflated-clavate; spores 
8, 20 to 32 » long, 11 to 16 » thick, ovoid-ellipsoid, dark brown, bilocular, constricted, 
a round spot of paler brown without isthmus in each loculus, the immature spores 
26 » long, 11 # thick and colorless; iodine staining all hymenial structures blue; no 
change with potassium hydrate. 
On bark of Pseudotsuga macrocarpa in our mountains from about 1,000 meters 
upward. Reported from Newfoundland by the late Rev. A. Waghorne. 
11. Rinodina hallii Tuck. 
Thallus effuse, ash color with a faint tint of light brown, more apparent when moist, 
rimose-areolate, the areola concave with crenulate border, KHO—, Ca(ClO),—; 
apothecia sessile, the thin lecanorine margin soon obsolete; disk dull black, convex, 
at first slightly pruinose; epithecium continuous, pale yellowish brown; thecium 
124 to 128 » high, with iodine deep blue, the epithecium not stained; paraphyses 
coherent, strict, the tips of some clavate and yellowish; hypothecium yellowish 
brown; asci inflated-clavate; spores 8, oblong, ellipsoid, 19 to 28 » long, 8 to 12 pt 
