60 ACOTYLEDONS. LICHENS. Peltidea. 



HAB. On the earth in moist situations, among rocks, most frequent 

 in the Highlands ; Glenkill Linn and Burn, Dumfries-shire, -Dr. 

 Burgess. Pass of Killicrankie, Mr. Turner and Hook. On the 

 earth of walls, Blair in Athol, Mr. Borrer and Hook. 



This is a small but very pretty species. 



2. P. scitiata, thallus ash -colon red whitish and veiny beneath, 

 the lobes rounded sinuated and* cut crenate and crisped, fertile 

 lobules very short, apothecia orbicular ascending nearly plane 

 brown somewhat entire. Adi. Syn. Lick. p. 237. Lichen 

 scutatus, E.B.t. 1834. 



HAB. Bark of trees, Dickson. I believe very rare. I never saw it 

 any where but upon trees in the Duke of Argyle's grounds at In- 

 verary, in company with Mr. Turner. 



3. P. horizontulis, thallus glaucous and brownish green lobed 

 crenate and shining pale beneath with numerous brown branch- 

 ing reticulated veins, fertile lobules abbreviated, apothecia 

 terminal plane horizontal transversely oblong reddish brown 

 with a nearly entire margin. Ach. Syn. Lich. p. 238. Lichen 

 horizontalis, Lightf. p. 849. E. B. t. 888.' 



HAB. Moist shady rocks and about the roots of trees, not uncommon, 

 Lightf. 



4. P. aphthosa, thallus green smooth roundly lobed sprinkled 

 with brown warts, whitish beneath with brown branching veins, 

 fertile lobules very long contracted in the middle their sides 

 reflexed, apothecia terminal large ascending reef-brown with 

 a lacerated margin. Adi. Syn. Lich. p. 238. Lichen aphthosus, 

 Lightf. p. S47. E.B.t.1119. 



HAB. Moist situations among rocks and moss, or by the roots of trees. 



Foot of the Pentland Hills, Mr. Balden. Moist rocks near the Falls 



of the Clyde, with 'shields, Mr. Turner and Hook. 

 A large handsome species ; has its name from the circumstance related 



by Linnaeus, that the Swedish peasants boil it in milk as a cure for 



the aphtha, or thrush, in children. 



5. P. canina, thallus greyish green with broad rounded lobes, 

 white beneath with brownish branching veins, fertile lobules 

 rather long with their sides reflexed, apothecia terminal nearly 

 erect revolute reddish brown with a subcrenuiated border. 

 Ach. Syn. Lich. p. 239. Lichen ca?rinus, Lightf. p. 845. 

 E. B. t. 2299. 



jS. rufescens, thallus polyphyllous concave reddish brown, pale 

 reddish white beneath with obsolete veins, lobes rounded in- 

 curved, fertile lobules short, apothecia terminal erect roundish 

 dark brown nearly entire at the margin. E. B. t. 2300 (Lichen 

 fiifescens). Peltidea canina, /3.? Ach. Syn. Lich. p. 239. Li- 

 chen caninus, jB. Lightf. p. 846. 



HAB. Upon the ground, among rnoss, roofs of houses., trees, c. very 

 common. $. with a. 



