Lichenes of New England. 441 
Linnæus, and to which genus it was url in the 
Flora of De Candolle. 
| L. polytropa, Ach. Meth. p. 72., Hook. l. c., Patel- 
laria polytropa, Hoffm., (cit. aati: ) Saig lc, 
Wallr. 1. c., Lecidea Ehrhartiana, 6. polytropa, Ach., 
Lichenogr. p. 192., Scher.! 1. c., Moug. & Nestl. ! 
l: c., Hals. l. c., Lichen polytropus, Ehrh., Ach. 
Prodr. — & Lecidea Ehrhartiana, Lichen Ehrharti- 
anus, Ach., Hals, cxt. que.— Rocks; Franconia 
Mountains. The form, with smaller patellule, which 
is the L. Ehrhartiana of authors, is united by Spren- 
gel with this species. It occurs on wood, (and also 
“common on rocks,” Hals.) and is enumerated in the 
Mass. Mee i r 
Lean curtis ne aai p. 390., Sahar: T 
l. c., Moug. & Nestl.! 1. c., Hook. 1. c., Parmétia a ceri- 
na, Ach. Meth., Wallr. 1. c., Patellaria cerina, Hoffm. 
(cit. Cand.) De Cand. 1. c., Lichen cerinus, Hedw., 
Ach. Prodr.— Trees, not uncommon. The line be- 
tween this, and other species allied to it, and some 
species of Lecidea, is hardly perceptible. Meyer and 
Sprengel consider this plant one of the forms of Par- 
melia parietina, in the young state. Wallroth is 
much excited by this arrangement: “ nec sieut," he 
says, ^ Sprengelius ez fonte spurco vix vero ad Na- 
ture mentem perhibuit, Parmeliæ parietinze subscri- 
benda." . (1. c. p. 472.) 
 Sevama nt sazicola, Hook. ! l. c., Lecanora saxico- 
la, Ach. Lichenogr. p. 431., Schier.! 1. c., Parmelia 
saxicola, Ach. Meth. p. 191., Spreng. l. c., Wallr. 1. c., 
