444 Lichenes of New England. 
differ from P. stellaris in the characters denoted " 
Acharius. 
-Prxricers polydactyla, Hoffm. (cit. Scher.) De 
Cand. l. c., Scher.! 1. c., Spreng. l. c., Wallr. l.c., 
Peltidea polydactyla, Ach. Meth. p. 286., Lichenogr. 
p. 519., Moug. & Nestl. ! 1. c., Hook, 1. c., Muhl.1.e, 
bin polydactylus, Ach. Pads — On the ground ; 
. mountain forests. About the White Mountains, and. 
the Franconia Mountains, common. The character 
to which this species owes its name is quite marked 
in my. plants, which also differ from the other species 
in the habit of the thallus. 
: P. ruféscens, Hoffm., Spreng. 1. c., E. T. Enum: 
Lich. N. Eng., & P. spuria, Ejusd. fani Cam- 
bridge, Ipswich, and elsewhere. Sprengel and Wall- 
roth consider P. spuria not distinct from P. rufescens.. 
Hooker's remarks seem also in favor-of this view, 
though he keeps the two species separate. — .- 
P. aphthósa, Hoffm. (cit. Scher.) De Cand. 1. €; 
Scher.! 1. c., Spreng. 1..c., Wallr. 1l. ¢., Peltidea 
aphthosa, Ach. Meth. p. 287., Lichenogr. p. 516., 
Moug. & Nestl.! 1. c., Hook. 1. c., Muhl: 1 cy Torr: 
l. c., Hals. 1. c., Mass. Catal. — On the ground ; - 
tain woods, angen the northern parts of ? 
. England. The largest and handsomest of our e 
cies. 
GynRÓPHORA epadockroa, Ach. Meth. p. 108; Li- 
chenogr. 229. 673., Moug. & Nestl.! 1. c Graphis 
vellea, à. discolor, Wallr. 1. c., Lecidea hirsuta, part. 
Spreng. l c. Umbilicaria denne; B. spadochroa, — 
