253 
to the substratum, smoothish to somewhat granulate, whitish to a 
pale ashy gray, more or less orbicular, thinning out and becom- 
ing paler at the circumference. Apothecia wavy and elevated 
irregular and coalescing. disappearing finally into the general 
crust. Spores broadly ellipsoid, muriform, decolorate, mono- 
spermous in the thekes, 4$-48 mic. 
On various barks San Luis Potosi, Mexico. Mr. C. G. 
Pringle, No. 222. A tropical Graphis, but well represented 
by the Mexican type. 
GRAPHIS SUBELEGANS, Nyl. Thallus very thin, contiguous, 
marked by a broad crenulate brown hypothalline band, smooth, 
becoming somewhat roughened in age, from pale fuscous to a 
yellow olivaceous color. Apothecia elevated, well defined, dif- 
fiform, often occurring in stellate clusters, from brown becoming 
black and covered with a more or less delicate paler bloom. 
Spores ellipsoid to ovoid, muriform, pale yellow, 24 }$ mic. 
On various close barks, San Luis Potosi, Mexico, Mr. C. G. 
Pringle, No. 162. A very beautiful species which is not likely 
to be confounded with any other. 
GRAPHIS COMMA, Ach. Thallus somewhat leprous, diffused, 
circumscribed and limited by a well-defined brown, waving line 
indicated by the hypothallus, smooth, shining, from a dull white 
to an ashy leaden gray. Apothecia very short, small and com- 
ma-like, from straight becoming slightly curved, black. Spores 
Plurilocular, fusiform, frequently bent, the spore-cells ranging 
rom 10 to 13, decolorate, 38-49 mic. 
A very well-pronounced species suggesting an Opegrapha, 
oe on /lex at Jacksonville, Florida. Mr. W. W. Calkins, 
0. 216, 
GRAPHIS BALBISINA, Nyl. Thallus adnate, leprous, dif- 
fused, marked by conspicuous serpentine ridges which divide the 
crust into segments but do not form areoles, from pale passing 
Into an ashy or dull gray. Apothecia at first innate but sats 
ing ¢levated, from short and simple advancing into Irregu 
orms, anastomosing with branched divisions paler than the thal- 
line Structure. Spores long, fusiform, plurilocular; spore cells 12 
to 14, decolorate ; 29-32 mic. : 
A very beautiful Graphis, quite distinct and occurring on 
trunks in the mountains near Monterey, Mexico, Mr. C. G. 
Pringle, No. 118. 
