E. Tuckerman on North American Lichens. 201 
Caticrum Curtisit, sp. nova, thallo byssaceo nigro (vel obso- 
leto) apotheciis minutis turbinatis disco subnitido nigro stipiti- 
us brevibus ex albido rufescentibus demum nigris. ore ma- 
jusculee ellipsoides vel elongato-ellipsoides (dactyline, Koerb.) 
fuscescentes simplices.—On the living bark of Rhus typbina, in 
Berkshire, Massachusetts; and of Robinia Pseudacacia, at the 
Hot Springs, Virginia, Rev. Dr. Curtis. The stipes like those of 
Calicium or Coniocybe nigricans, Fr. (not of Tuckerm. Synops. 
Lich. N. E. which is C. subtile, on Bark) but the apothecia quite 
different, and the Spores very much larger than in that species; 
as in C. eusporum, Nyl., to which, and C. byssaceum, Fr., the 
lichen is probably nearest. 
BOMYCES ABSOLUTUS, sp. nova, thallo crustaceo effuso te- 
nuissimo submembranaceo leeteviridi; apotheciis stipitatis incar- 
natis planis disco demum convexiusculo marginem tenuem ex- 
[CLADONIA DACTYLOTA, sp. nova, thalli squamulis amplis 
erectis subtus albo-pulverulentis podetia gracilescentia eylindrica 
membranaceo-corticata levigata viridi-pallescentia e margine pro- 
ferentibus, scyphis angustatis margine subincurvis denticulatis 
on oblique prolifero-palmatis; apotheciis carneo-fuscescen- 
us, 
color of the apothecia. The white, cushion-like, pow ae 
p (in the latter case appearing clearly to be deliquescent squamules) 
make perhaps the ‘most striking, however an abnormal feature 
EREOCAULON NANO! . nova, podetiis pumilis erectis 
Cspitoso-conglomeratis subnudis validi tereti-compressis a basi 
#ge apicemque versus fastigiato-ramosis albidis, phyllocladiis 
‘pices confertis e rotundato-subsquamaceis glaucis demum 
SECOND SERIES, Vor. XXVII, No. 63.—SEPT., 1650 
