895 
Apothecia flattish, scattered at first, a little concave, but afterwards 
somewhat convex, margin soon disappearing, disk brown. Spores 
acicular, hyaline 3040 
3X 4 
On barks, San Luis Potosi, Mexico. Mr. C. G. Pringle, 1888, 
no. 183. 
mic. 
ARTHONIA DISTINCTA n. sp. 
Thallus thin, smooth, white, indeterminate, slightly mealy. 
Apothecia very minute, round-lobed, and disposed to become 
radiate in small clusters, slightly sunken or in part even with the 
thallus; disk black, with a rough or uneven surface. Spores dark, 
3-4-locular, broadly ovoid 15X18 mic. 
7 8 < rf . 
On smooth barks, San Luis Potosi, Mexico. Mr. C. G. Prin- 
gle, 1888. The similarity of this plant to A. radiata is marked, 
but certain characters determine it to be distinct. 
TRYPETHELIUM PRINGLE! n. sp. 
Thallus thin, smooth or generally finely tuberculate, gars 
founded, elevated, diffused, from pale yellow to white ; ee 
rominent, round to oblong and irregularly protruding, paler 
than the Surrounding crust. Osteoles minute, rounded, very 
Prominent, dark brown. Spores broadly ellipsoid, quadriseptate 
15X20 
A well marked species. contrasting strikingly with 7: oligo- 
farpum Mull. Lich. Australia. Occurs on the trunks of trees near 
San Luis Potosi, Mexico. Mr. C. G. Pringle, no. 226. 
TRYPETHELIUM SCITULENS Nn. sp. 
Thallus di ghtly transversly wrinkled and smoothish, of an 
°paque, olive green color. Stromas prominent, rounded, be- 
coming at length obl ong, solitary or generally confluent, and more 
Or less of the same color as the thallus. Osteoles numerous, very 
minute and cl osely approximate, mostly brown. Spores oblong 
ellipsoid, 10-septate 2733 
10X12 i i 
On the trunie of various trees near San Luis Potosi, Mexico. 
Mr. C. G, Pringle, no. 200. 
mic. % 
Pyrenuta PAPULIFORMIS N. sp. _ 
Thallus extremely thin, evanescent, diffuse, pale ash color, 
and often differing but slightly from the normal shade of the 
Apothecia somewhat conoidal, black with a round spread- : ee 
a 
