1078 The American Naturalist. [November, 
BOTANY. 
Notes on Rare East Tennessee Lichens.—Two months of 
constant work, for which previous experience in Florida had prepared 
me, have been well rewarded by the securing of two hundred species, 
many, of course, common. Tennessee has ever been a paradise for 
the phanerogamic botanist, and justly so; but I venture to affirm that 
but few have delved very deeply for our humble lichens. And yet the 
inherentänterest attaching to these plants is vastly enhanced by the in- 
spiring associations of locality. Mountain-tops and their craggy sides, 
rent in places by deep cafions with towering walls on either side, 
two thousand feet in height, showing different geological strata, and 
affording a foothold for the holly, birch, and hemlock, present peculiar 
charms as well as advantages,—for each different stratum or tree may 
be the favorite substrate required to promote the growth of certain 
species. I find this fastidiousness as true of lichens as of their more 
pretentious and showy neighbors in the floral world. Economy of 
space will confine my notes now to some of those species that are 
practically rare or unknown in American Herbaria, 
Ramalina calicaris, var. farinacea Schaer ; somewhat abundant on 
sandstone on Lookout Mountain. 
Theloschistes concolor Dicks ; on oak and hickory trees; common. 
Parmelia ambigua Ach.; on Pinus mitis. I omit a dozen other fine 
species, of which P. borreri is best developed. 
Physcia ciliaris, var. crinalis Schaer ; on oaks and Nyssa up to two 
thousand feet elevation ; very fine. 
Physcia aquila, var. detonsa Tuckerm.; abundant on Quercus on 
Lookout Mountain, and also on sandstones. 
Pyxine sorediata Fr. ; very finely fruited ; diodes on sandstones, 
occasional on oaks. 
Umbilicaria pennsylvanica Hoffm.; on sandstones; common ; most 
developed at high elevation. 
Sticta pulmonaria L. ; found only twice, —on oaks along the moun- 
tains, 
Peltigera canina ; abundant in damp, shaded gorges. 
Leptogium juniperinum Tuckerm, ; exists in rosulate clusters on rocks 
and on cedar ; a subspecies of Z. tremelloides ; Lookout Mountain. 
Lecanora affords interesting forms, Among them, Z. cinerea, L. 
Badia, L. tartarea, a very elegant species with immense apothecia, in 
