' 3 
gine elevatis undudatis complicatis supra rugoso-papu- 
esis sublus pall 'dioribus lazunosis costatis, periphericis 
rotundatis ; apotheciis submediocribus confertis sessili- 
_ bus, disco plano-convexo e fusco-rufo nigricante, margine 
tenui integerrimo. Spore octonee, luto-fusiformes, 4--0- 
Lluste, diam. 3—6 pl bngiores, incolores. Granitie 
rocks, common in New England, and in the Bluo 
Ridge of Virginia; and perhaps throughout the Ap- 
palachiun chain. New Jersey; Mr. C. A. Austin. 
Mountains of North Garolina; Rev. Dr. Curtis. C. 
nigrescens is rather monophyllous, and confined to 
trees; butits lobation may conceivably assume the 
form of that of the present, which especially differs in 
its fusiform-ellipsoid, or broad-fwsiform spores. 
CoLLEMA microptychium (sp. nova) thallo minuto pulvi- 
nato submemlranaceo atrovirente, Lbis rotundatis 
crenatis ercctiusculis gyroso-ccmylicatis ; apothecis 
sessililus planis, disco rufo, margine integro, Spore 
octonee, vermiformi-bacillares, pleioblaste, diam. 6-10 
plo longiores, incolores—Elm trunks at Amherst ; 
common. Readily recognizable, especially when in- 
fertile, by the erect, rounded, plaited lobules which 
constitute the minute, pulvinate fronds. These 
scarcely exceed a quarter of an inch in diameter. The 
spores are smaller than those of C. /eptaleum (Obs. - 
Lich. 1. c. 6, p. 233) but evidently associate the lichen 
- with it. The latter is however sufficiently diverse in 
its best, and appears to be always distinguishable in 
its minutest conditions: 

