a Ate ror EY eee. 
LICHENS. 
The writer, owing to his want of knowledge of this order, had felt 
compelled very reluctantly to omit the Lichens from the flora, as no 
authentically-named collection existed of sufficient size to make a 
list of any value. But in the present year Mr. Charles J. Sprague 
most kindly offered to take what specimens were already in the her- 
barium, name them, and, adding those species he had himself col- 
lected in the vicinity of Magnolia, prepare the whole list. — 
For this kindness the writer desires to express his obligations, 
feeling it a great pleasure to be able to present the list from the pen 
of so competent an authority as Mr. Sprague. 

(The following list is, probably, but a portion of the species occur- 
ring in Essex county, as the region has not been thoroughly explored. 
It comprises only such as are positively known to grow there.) 
1. Ramalina, Ach., De Not. 
1. calicaris, Fr. 
var. fastigata, fr. 
var. farinacea, fF’. 
2. pollinaria, Ach. 
2. Cetraria, Ach., Fr. 
1. Islandica, Ach. 
2. ciliaris, Ach. 
3. lacunosa, Ach. 
var. Atlantica, Tuck. 
4. aleurites (Ach.), Th. Fr. 
5. Oakesiana, Tuck. 
6. juniperina (Z.), Ach. 
var. Pinastri, Ach. 
3. Evernia, Ach., Mann. 
1, furfuracea (Z.), Mann. 
2. prunastri (Z.), Ach. 
(149) 
